Line data Source code
1 : /*
2 : * contrib/tablefunc/tablefunc.c
3 : *
4 : *
5 : * tablefunc
6 : *
7 : * Sample to demonstrate C functions which return setof scalar
8 : * and setof composite.
9 : * Joe Conway <mail@joeconway.com>
10 : * And contributors:
11 : * Nabil Sayegh <postgresql@e-trolley.de>
12 : *
13 : * Copyright (c) 2002-2026, PostgreSQL Global Development Group
14 : *
15 : * Permission to use, copy, modify, and distribute this software and its
16 : * documentation for any purpose, without fee, and without a written agreement
17 : * is hereby granted, provided that the above copyright notice and this
18 : * paragraph and the following two paragraphs appear in all copies.
19 : *
20 : * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR
21 : * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
22 : * LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
23 : * DOCUMENTATION, EVEN IF THE AUTHOR OR DISTRIBUTORS HAVE BEEN ADVISED OF THE
24 : * POSSIBILITY OF SUCH DAMAGE.
25 : *
26 : * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
27 : * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
28 : * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
29 : * ON AN "AS IS" BASIS, AND THE AUTHOR AND DISTRIBUTORS HAS NO OBLIGATIONS TO
30 : * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
31 : *
32 : */
33 : #include "postgres.h"
34 :
35 : #include <math.h>
36 :
37 : #include "access/htup_details.h"
38 : #include "catalog/pg_type.h"
39 : #include "common/pg_prng.h"
40 : #include "executor/spi.h"
41 : #include "fmgr.h"
42 : #include "funcapi.h"
43 : #include "lib/stringinfo.h"
44 : #include "miscadmin.h"
45 : #include "utils/builtins.h"
46 :
47 0 : PG_MODULE_MAGIC_EXT(
48 : .name = "tablefunc",
49 : .version = PG_VERSION
50 : );
51 :
52 : static HTAB *load_categories_hash(char *cats_sql, MemoryContext per_query_ctx);
53 : static Tuplestorestate *get_crosstab_tuplestore(char *sql,
54 : HTAB *crosstab_hash,
55 : TupleDesc tupdesc,
56 : bool randomAccess);
57 : static void validateConnectbyTupleDesc(TupleDesc td, bool show_branch, bool show_serial);
58 : static void compatCrosstabTupleDescs(TupleDesc ret_tupdesc, TupleDesc sql_tupdesc);
59 : static void compatConnectbyTupleDescs(TupleDesc ret_tupdesc, TupleDesc sql_tupdesc);
60 : static void get_normal_pair(float8 *x1, float8 *x2);
61 : static Tuplestorestate *connectby(char *relname,
62 : char *key_fld,
63 : char *parent_key_fld,
64 : char *orderby_fld,
65 : char *branch_delim,
66 : char *start_with,
67 : int max_depth,
68 : bool show_branch,
69 : bool show_serial,
70 : MemoryContext per_query_ctx,
71 : bool randomAccess,
72 : AttInMetadata *attinmeta);
73 : static void build_tuplestore_recursively(char *key_fld,
74 : char *parent_key_fld,
75 : char *relname,
76 : char *orderby_fld,
77 : char *branch_delim,
78 : char *start_with,
79 : char *branch,
80 : int level,
81 : int *serial,
82 : int max_depth,
83 : bool show_branch,
84 : bool show_serial,
85 : MemoryContext per_query_ctx,
86 : AttInMetadata *attinmeta,
87 : Tuplestorestate *tupstore);
88 :
89 : typedef struct
90 : {
91 : float8 mean; /* mean of the distribution */
92 : float8 stddev; /* stddev of the distribution */
93 : float8 carry_val; /* hold second generated value */
94 : bool use_carry; /* use second generated value */
95 : } normal_rand_fctx;
96 :
97 : #define xpfree(var_) \
98 : do { \
99 : if (var_ != NULL) \
100 : { \
101 : pfree(var_); \
102 : var_ = NULL; \
103 : } \
104 : } while (0)
105 :
106 : #define xpstrdup(tgtvar_, srcvar_) \
107 : do { \
108 : if (srcvar_) \
109 : tgtvar_ = pstrdup(srcvar_); \
110 : else \
111 : tgtvar_ = NULL; \
112 : } while (0)
113 :
114 : #define xstreq(tgtvar_, srcvar_) \
115 : (((tgtvar_ == NULL) && (srcvar_ == NULL)) || \
116 : ((tgtvar_ != NULL) && (srcvar_ != NULL) && (strcmp(tgtvar_, srcvar_) == 0)))
117 :
118 : /* sign, 10 digits, '\0' */
119 : #define INT32_STRLEN 12
120 :
121 : /* stored info for a crosstab category */
122 : typedef struct crosstab_cat_desc
123 : {
124 : char *catname; /* full category name */
125 : uint64 attidx; /* zero based */
126 : } crosstab_cat_desc;
127 :
128 : #define MAX_CATNAME_LEN NAMEDATALEN
129 : #define INIT_CATS 64
130 :
131 : #define crosstab_HashTableLookup(HASHTAB, CATNAME, CATDESC) \
132 : do { \
133 : crosstab_HashEnt *hentry; char key[MAX_CATNAME_LEN]; \
134 : \
135 : MemSet(key, 0, MAX_CATNAME_LEN); \
136 : snprintf(key, MAX_CATNAME_LEN - 1, "%s", CATNAME); \
137 : hentry = (crosstab_HashEnt*) hash_search(HASHTAB, \
138 : key, HASH_FIND, NULL); \
139 : if (hentry) \
140 : CATDESC = hentry->catdesc; \
141 : else \
142 : CATDESC = NULL; \
143 : } while(0)
144 :
145 : #define crosstab_HashTableInsert(HASHTAB, CATDESC) \
146 : do { \
147 : crosstab_HashEnt *hentry; bool found; char key[MAX_CATNAME_LEN]; \
148 : \
149 : MemSet(key, 0, MAX_CATNAME_LEN); \
150 : snprintf(key, MAX_CATNAME_LEN - 1, "%s", CATDESC->catname); \
151 : hentry = (crosstab_HashEnt*) hash_search(HASHTAB, \
152 : key, HASH_ENTER, &found); \
153 : if (found) \
154 : ereport(ERROR, \
155 : (errcode(ERRCODE_DUPLICATE_OBJECT), \
156 : errmsg("duplicate category name"))); \
157 : hentry->catdesc = CATDESC; \
158 : } while(0)
159 :
160 : /* hash table */
161 : typedef struct crosstab_hashent
162 : {
163 : char internal_catname[MAX_CATNAME_LEN];
164 : crosstab_cat_desc *catdesc;
165 : } crosstab_HashEnt;
166 :
167 : /*
168 : * normal_rand - return requested number of random values
169 : * with a Gaussian (Normal) distribution.
170 : *
171 : * inputs are int numvals, float8 mean, and float8 stddev
172 : * returns setof float8
173 : */
174 0 : PG_FUNCTION_INFO_V1(normal_rand);
175 : Datum
176 0 : normal_rand(PG_FUNCTION_ARGS)
177 : {
178 0 : FuncCallContext *funcctx;
179 0 : uint64 call_cntr;
180 0 : uint64 max_calls;
181 0 : normal_rand_fctx *fctx;
182 0 : float8 mean;
183 0 : float8 stddev;
184 0 : float8 carry_val;
185 0 : bool use_carry;
186 0 : MemoryContext oldcontext;
187 :
188 : /* stuff done only on the first call of the function */
189 0 : if (SRF_IS_FIRSTCALL())
190 : {
191 0 : int32 num_tuples;
192 :
193 : /* create a function context for cross-call persistence */
194 0 : funcctx = SRF_FIRSTCALL_INIT();
195 :
196 : /*
197 : * switch to memory context appropriate for multiple function calls
198 : */
199 0 : oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
200 :
201 : /* total number of tuples to be returned */
202 0 : num_tuples = PG_GETARG_INT32(0);
203 0 : if (num_tuples < 0)
204 0 : ereport(ERROR,
205 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
206 : errmsg("number of rows cannot be negative")));
207 0 : funcctx->max_calls = num_tuples;
208 :
209 : /* allocate memory for user context */
210 0 : fctx = palloc_object(normal_rand_fctx);
211 :
212 : /*
213 : * Use fctx to keep track of upper and lower bounds from call to call.
214 : * It will also be used to carry over the spare value we get from the
215 : * Box-Muller algorithm so that we only actually calculate a new value
216 : * every other call.
217 : */
218 0 : fctx->mean = PG_GETARG_FLOAT8(1);
219 0 : fctx->stddev = PG_GETARG_FLOAT8(2);
220 0 : fctx->carry_val = 0;
221 0 : fctx->use_carry = false;
222 :
223 0 : funcctx->user_fctx = fctx;
224 :
225 0 : MemoryContextSwitchTo(oldcontext);
226 0 : }
227 :
228 : /* stuff done on every call of the function */
229 0 : funcctx = SRF_PERCALL_SETUP();
230 :
231 0 : call_cntr = funcctx->call_cntr;
232 0 : max_calls = funcctx->max_calls;
233 0 : fctx = funcctx->user_fctx;
234 0 : mean = fctx->mean;
235 0 : stddev = fctx->stddev;
236 0 : carry_val = fctx->carry_val;
237 0 : use_carry = fctx->use_carry;
238 :
239 0 : if (call_cntr < max_calls) /* do when there is more left to send */
240 : {
241 0 : float8 result;
242 :
243 0 : if (use_carry)
244 : {
245 : /*
246 : * reset use_carry and use second value obtained on last pass
247 : */
248 0 : fctx->use_carry = false;
249 0 : result = carry_val;
250 0 : }
251 : else
252 : {
253 0 : float8 normval_1;
254 0 : float8 normval_2;
255 :
256 : /* Get the next two normal values */
257 0 : get_normal_pair(&normval_1, &normval_2);
258 :
259 : /* use the first */
260 0 : result = mean + (stddev * normval_1);
261 :
262 : /* and save the second */
263 0 : fctx->carry_val = mean + (stddev * normval_2);
264 0 : fctx->use_carry = true;
265 0 : }
266 :
267 : /* send the result */
268 0 : SRF_RETURN_NEXT(funcctx, Float8GetDatum(result));
269 0 : }
270 : else
271 : /* do when there is no more left */
272 0 : SRF_RETURN_DONE(funcctx);
273 0 : }
274 :
275 : /*
276 : * get_normal_pair()
277 : * Assigns normally distributed (Gaussian) values to a pair of provided
278 : * parameters, with mean 0, standard deviation 1.
279 : *
280 : * This routine implements Algorithm P (Polar method for normal deviates)
281 : * from Knuth's _The_Art_of_Computer_Programming_, Volume 2, 3rd ed., pages
282 : * 122-126. Knuth cites his source as "The polar method", G. E. P. Box, M. E.
283 : * Muller, and G. Marsaglia, _Annals_Math,_Stat._ 29 (1958), 610-611.
284 : *
285 : */
286 : static void
287 0 : get_normal_pair(float8 *x1, float8 *x2)
288 : {
289 0 : float8 u1,
290 : u2,
291 : v1,
292 : v2,
293 : s;
294 :
295 0 : do
296 : {
297 0 : u1 = pg_prng_double(&pg_global_prng_state);
298 0 : u2 = pg_prng_double(&pg_global_prng_state);
299 :
300 0 : v1 = (2.0 * u1) - 1.0;
301 0 : v2 = (2.0 * u2) - 1.0;
302 :
303 0 : s = v1 * v1 + v2 * v2;
304 0 : } while (s >= 1.0);
305 :
306 0 : if (s == 0)
307 : {
308 0 : *x1 = 0;
309 0 : *x2 = 0;
310 0 : }
311 : else
312 : {
313 0 : s = sqrt((-2.0 * log(s)) / s);
314 0 : *x1 = v1 * s;
315 0 : *x2 = v2 * s;
316 : }
317 0 : }
318 :
319 : /*
320 : * crosstab - create a crosstab of rowids and values columns from a
321 : * SQL statement returning one rowid column, one category column,
322 : * and one value column.
323 : *
324 : * e.g. given sql which produces:
325 : *
326 : * rowid cat value
327 : * ------+-------+-------
328 : * row1 cat1 val1
329 : * row1 cat2 val2
330 : * row1 cat3 val3
331 : * row1 cat4 val4
332 : * row2 cat1 val5
333 : * row2 cat2 val6
334 : * row2 cat3 val7
335 : * row2 cat4 val8
336 : *
337 : * crosstab returns:
338 : * <===== values columns =====>
339 : * rowid cat1 cat2 cat3 cat4
340 : * ------+-------+-------+-------+-------
341 : * row1 val1 val2 val3 val4
342 : * row2 val5 val6 val7 val8
343 : *
344 : * NOTES:
345 : * 1. SQL result must be ordered by 1,2.
346 : * 2. The number of values columns depends on the tuple description
347 : * of the function's declared return type. The return type's columns
348 : * must match the datatypes of the SQL query's result. The datatype
349 : * of the category column can be anything, however.
350 : * 3. Missing values (i.e. not enough adjacent rows of same rowid to
351 : * fill the number of result values columns) are filled in with nulls.
352 : * 4. Extra values (i.e. too many adjacent rows of same rowid to fill
353 : * the number of result values columns) are skipped.
354 : * 5. Rows with all nulls in the values columns are skipped.
355 : */
356 0 : PG_FUNCTION_INFO_V1(crosstab);
357 : Datum
358 0 : crosstab(PG_FUNCTION_ARGS)
359 : {
360 0 : char *sql = text_to_cstring(PG_GETARG_TEXT_PP(0));
361 0 : ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
362 0 : Tuplestorestate *tupstore;
363 0 : TupleDesc tupdesc;
364 0 : uint64 call_cntr;
365 0 : uint64 max_calls;
366 0 : AttInMetadata *attinmeta;
367 0 : SPITupleTable *spi_tuptable;
368 0 : TupleDesc spi_tupdesc;
369 0 : bool firstpass;
370 0 : char *lastrowid;
371 0 : int i;
372 0 : int num_categories;
373 0 : MemoryContext per_query_ctx;
374 0 : MemoryContext oldcontext;
375 0 : int ret;
376 0 : uint64 proc;
377 :
378 : /* check to see if caller supports us returning a tuplestore */
379 0 : if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
380 0 : ereport(ERROR,
381 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
382 : errmsg("set-valued function called in context that cannot accept a set")));
383 0 : if (!(rsinfo->allowedModes & SFRM_Materialize))
384 0 : ereport(ERROR,
385 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
386 : errmsg("materialize mode required, but it is not allowed in this context")));
387 :
388 0 : per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
389 :
390 : /* Connect to SPI manager */
391 0 : SPI_connect();
392 :
393 : /* Retrieve the desired rows */
394 0 : ret = SPI_execute(sql, true, 0);
395 0 : proc = SPI_processed;
396 :
397 : /* If no qualifying tuples, fall out early */
398 0 : if (ret != SPI_OK_SELECT || proc == 0)
399 : {
400 0 : SPI_finish();
401 0 : rsinfo->isDone = ExprEndResult;
402 0 : PG_RETURN_NULL();
403 0 : }
404 :
405 0 : spi_tuptable = SPI_tuptable;
406 0 : spi_tupdesc = spi_tuptable->tupdesc;
407 :
408 : /*----------
409 : * The provided SQL query must always return three columns.
410 : *
411 : * 1. rowname
412 : * the label or identifier for each row in the final result
413 : * 2. category
414 : * the label or identifier for each column in the final result
415 : * 3. values
416 : * the value for each column in the final result
417 : *----------
418 : */
419 0 : if (spi_tupdesc->natts != 3)
420 0 : ereport(ERROR,
421 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
422 : errmsg("invalid crosstab source data query"),
423 : errdetail("The query must return 3 columns: row_name, category, and value.")));
424 :
425 : /* get a tuple descriptor for our result type */
426 0 : switch (get_call_result_type(fcinfo, NULL, &tupdesc))
427 : {
428 : case TYPEFUNC_COMPOSITE:
429 : /* success */
430 : break;
431 : case TYPEFUNC_RECORD:
432 : /* failed to determine actual type of RECORD */
433 0 : ereport(ERROR,
434 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
435 : errmsg("function returning record called in context "
436 : "that cannot accept type record")));
437 0 : break;
438 : default:
439 : /* result type isn't composite */
440 0 : ereport(ERROR,
441 : (errcode(ERRCODE_DATATYPE_MISMATCH),
442 : errmsg("return type must be a row type")));
443 0 : break;
444 : }
445 :
446 : /*
447 : * Check that return tupdesc is compatible with the data we got from SPI,
448 : * at least based on number and type of attributes
449 : */
450 0 : compatCrosstabTupleDescs(tupdesc, spi_tupdesc);
451 :
452 : /*
453 : * switch to long-lived memory context
454 : */
455 0 : oldcontext = MemoryContextSwitchTo(per_query_ctx);
456 :
457 : /* make sure we have a persistent copy of the result tupdesc */
458 0 : tupdesc = CreateTupleDescCopy(tupdesc);
459 :
460 : /* initialize our tuplestore in long-lived context */
461 0 : tupstore =
462 0 : tuplestore_begin_heap(rsinfo->allowedModes & SFRM_Materialize_Random,
463 0 : false, work_mem);
464 :
465 0 : MemoryContextSwitchTo(oldcontext);
466 :
467 : /*
468 : * Generate attribute metadata needed later to produce tuples from raw C
469 : * strings
470 : */
471 0 : attinmeta = TupleDescGetAttInMetadata(tupdesc);
472 :
473 : /* total number of tuples to be examined */
474 0 : max_calls = proc;
475 :
476 : /* the return tuple always must have 1 rowid + num_categories columns */
477 0 : num_categories = tupdesc->natts - 1;
478 :
479 0 : firstpass = true;
480 0 : lastrowid = NULL;
481 :
482 0 : for (call_cntr = 0; call_cntr < max_calls; call_cntr++)
483 : {
484 0 : bool skip_tuple = false;
485 0 : char **values;
486 :
487 : /* allocate and zero space */
488 0 : values = (char **) palloc0((1 + num_categories) * sizeof(char *));
489 :
490 : /*
491 : * now loop through the sql results and assign each value in sequence
492 : * to the next category
493 : */
494 0 : for (i = 0; i < num_categories; i++)
495 : {
496 0 : HeapTuple spi_tuple;
497 0 : char *rowid;
498 :
499 : /* see if we've gone too far already */
500 0 : if (call_cntr >= max_calls)
501 0 : break;
502 :
503 : /* get the next sql result tuple */
504 0 : spi_tuple = spi_tuptable->vals[call_cntr];
505 :
506 : /* get the rowid from the current sql result tuple */
507 0 : rowid = SPI_getvalue(spi_tuple, spi_tupdesc, 1);
508 :
509 : /*
510 : * If this is the first pass through the values for this rowid,
511 : * set the first column to rowid
512 : */
513 0 : if (i == 0)
514 : {
515 0 : xpstrdup(values[0], rowid);
516 :
517 : /*
518 : * Check to see if the rowid is the same as that of the last
519 : * tuple sent -- if so, skip this tuple entirely
520 : */
521 0 : if (!firstpass && xstreq(lastrowid, rowid))
522 : {
523 0 : xpfree(rowid);
524 0 : skip_tuple = true;
525 0 : break;
526 : }
527 0 : }
528 :
529 : /*
530 : * If rowid hasn't changed on us, continue building the output
531 : * tuple.
532 : */
533 0 : if (xstreq(rowid, values[0]))
534 : {
535 : /*
536 : * Get the next category item value, which is always attribute
537 : * number three.
538 : *
539 : * Be careful to assign the value to the array index based on
540 : * which category we are presently processing.
541 : */
542 0 : values[1 + i] = SPI_getvalue(spi_tuple, spi_tupdesc, 3);
543 :
544 : /*
545 : * increment the counter since we consume a row for each
546 : * category, but not for last pass because the outer loop will
547 : * do that for us
548 : */
549 0 : if (i < (num_categories - 1))
550 0 : call_cntr++;
551 0 : xpfree(rowid);
552 0 : }
553 : else
554 : {
555 : /*
556 : * We'll fill in NULLs for the missing values, but we need to
557 : * decrement the counter since this sql result row doesn't
558 : * belong to the current output tuple.
559 : */
560 0 : call_cntr--;
561 0 : xpfree(rowid);
562 0 : break;
563 : }
564 0 : }
565 :
566 0 : if (!skip_tuple)
567 : {
568 0 : HeapTuple tuple;
569 :
570 : /* build the tuple and store it */
571 0 : tuple = BuildTupleFromCStrings(attinmeta, values);
572 0 : tuplestore_puttuple(tupstore, tuple);
573 0 : heap_freetuple(tuple);
574 0 : }
575 :
576 : /* Remember current rowid */
577 0 : xpfree(lastrowid);
578 0 : xpstrdup(lastrowid, values[0]);
579 0 : firstpass = false;
580 :
581 : /* Clean up */
582 0 : for (i = 0; i < num_categories + 1; i++)
583 0 : if (values[i] != NULL)
584 0 : pfree(values[i]);
585 0 : pfree(values);
586 0 : }
587 :
588 : /* let the caller know we're sending back a tuplestore */
589 0 : rsinfo->returnMode = SFRM_Materialize;
590 0 : rsinfo->setResult = tupstore;
591 0 : rsinfo->setDesc = tupdesc;
592 :
593 : /* release SPI related resources (and return to caller's context) */
594 0 : SPI_finish();
595 :
596 0 : return (Datum) 0;
597 0 : }
598 :
599 : /*
600 : * crosstab_hash - reimplement crosstab as materialized function and
601 : * properly deal with missing values (i.e. don't pack remaining
602 : * values to the left)
603 : *
604 : * crosstab - create a crosstab of rowids and values columns from a
605 : * SQL statement returning one rowid column, one category column,
606 : * and one value column.
607 : *
608 : * e.g. given sql which produces:
609 : *
610 : * rowid cat value
611 : * ------+-------+-------
612 : * row1 cat1 val1
613 : * row1 cat2 val2
614 : * row1 cat4 val4
615 : * row2 cat1 val5
616 : * row2 cat2 val6
617 : * row2 cat3 val7
618 : * row2 cat4 val8
619 : *
620 : * crosstab returns:
621 : * <===== values columns =====>
622 : * rowid cat1 cat2 cat3 cat4
623 : * ------+-------+-------+-------+-------
624 : * row1 val1 val2 null val4
625 : * row2 val5 val6 val7 val8
626 : *
627 : * NOTES:
628 : * 1. SQL result must be ordered by 1.
629 : * 2. The number of values columns depends on the tuple description
630 : * of the function's declared return type.
631 : * 3. Missing values (i.e. missing category) are filled in with nulls.
632 : * 4. Extra values (i.e. not in category results) are skipped.
633 : */
634 0 : PG_FUNCTION_INFO_V1(crosstab_hash);
635 : Datum
636 0 : crosstab_hash(PG_FUNCTION_ARGS)
637 : {
638 0 : char *sql = text_to_cstring(PG_GETARG_TEXT_PP(0));
639 0 : char *cats_sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
640 0 : ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
641 0 : TupleDesc tupdesc;
642 0 : MemoryContext per_query_ctx;
643 0 : MemoryContext oldcontext;
644 0 : HTAB *crosstab_hash;
645 :
646 : /* check to see if caller supports us returning a tuplestore */
647 0 : if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
648 0 : ereport(ERROR,
649 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
650 : errmsg("set-valued function called in context that cannot accept a set")));
651 0 : if (!(rsinfo->allowedModes & SFRM_Materialize) ||
652 0 : rsinfo->expectedDesc == NULL)
653 0 : ereport(ERROR,
654 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
655 : errmsg("materialize mode required, but it is not allowed in this context")));
656 :
657 0 : per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
658 0 : oldcontext = MemoryContextSwitchTo(per_query_ctx);
659 :
660 : /* get the requested return tuple description */
661 0 : tupdesc = CreateTupleDescCopy(rsinfo->expectedDesc);
662 :
663 : /*
664 : * Check to make sure we have a reasonable tuple descriptor
665 : *
666 : * Note we will attempt to coerce the values into whatever the return
667 : * attribute type is and depend on the "in" function to complain if
668 : * needed.
669 : */
670 0 : if (tupdesc->natts < 2)
671 0 : ereport(ERROR,
672 : (errcode(ERRCODE_DATATYPE_MISMATCH),
673 : errmsg("invalid crosstab return type"),
674 : errdetail("Return row must have at least two columns.")));
675 :
676 : /* load up the categories hash table */
677 0 : crosstab_hash = load_categories_hash(cats_sql, per_query_ctx);
678 :
679 : /* let the caller know we're sending back a tuplestore */
680 0 : rsinfo->returnMode = SFRM_Materialize;
681 :
682 : /* now go build it */
683 0 : rsinfo->setResult = get_crosstab_tuplestore(sql,
684 0 : crosstab_hash,
685 0 : tupdesc,
686 0 : rsinfo->allowedModes & SFRM_Materialize_Random);
687 :
688 : /*
689 : * SFRM_Materialize mode expects us to return a NULL Datum. The actual
690 : * tuples are in our tuplestore and passed back through rsinfo->setResult.
691 : * rsinfo->setDesc is set to the tuple description that we actually used
692 : * to build our tuples with, so the caller can verify we did what it was
693 : * expecting.
694 : */
695 0 : rsinfo->setDesc = tupdesc;
696 0 : MemoryContextSwitchTo(oldcontext);
697 :
698 0 : return (Datum) 0;
699 0 : }
700 :
701 : /*
702 : * load up the categories hash table
703 : */
704 : static HTAB *
705 0 : load_categories_hash(char *cats_sql, MemoryContext per_query_ctx)
706 : {
707 0 : HTAB *crosstab_hash;
708 0 : HASHCTL ctl;
709 0 : int ret;
710 0 : uint64 proc;
711 0 : MemoryContext SPIcontext;
712 :
713 : /* initialize the category hash table */
714 0 : ctl.keysize = MAX_CATNAME_LEN;
715 0 : ctl.entrysize = sizeof(crosstab_HashEnt);
716 0 : ctl.hcxt = per_query_ctx;
717 :
718 : /*
719 : * use INIT_CATS, defined above as a guess of how many hash table entries
720 : * to create, initially
721 : */
722 0 : crosstab_hash = hash_create("crosstab hash",
723 : INIT_CATS,
724 : &ctl,
725 : HASH_ELEM | HASH_STRINGS | HASH_CONTEXT);
726 :
727 : /* Connect to SPI manager */
728 0 : SPI_connect();
729 :
730 : /* Retrieve the category name rows */
731 0 : ret = SPI_execute(cats_sql, true, 0);
732 0 : proc = SPI_processed;
733 :
734 : /* Check for qualifying tuples */
735 0 : if ((ret == SPI_OK_SELECT) && (proc > 0))
736 : {
737 0 : SPITupleTable *spi_tuptable = SPI_tuptable;
738 0 : TupleDesc spi_tupdesc = spi_tuptable->tupdesc;
739 0 : uint64 i;
740 :
741 : /*
742 : * The provided categories SQL query must always return one column:
743 : * category - the label or identifier for each column
744 : */
745 0 : if (spi_tupdesc->natts != 1)
746 0 : ereport(ERROR,
747 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
748 : errmsg("invalid crosstab categories query"),
749 : errdetail("The query must return one column.")));
750 :
751 0 : for (i = 0; i < proc; i++)
752 : {
753 0 : crosstab_cat_desc *catdesc;
754 0 : char *catname;
755 0 : HeapTuple spi_tuple;
756 :
757 : /* get the next sql result tuple */
758 0 : spi_tuple = spi_tuptable->vals[i];
759 :
760 : /* get the category from the current sql result tuple */
761 0 : catname = SPI_getvalue(spi_tuple, spi_tupdesc, 1);
762 0 : if (catname == NULL)
763 0 : ereport(ERROR,
764 : (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
765 : errmsg("crosstab category value must not be null")));
766 :
767 0 : SPIcontext = MemoryContextSwitchTo(per_query_ctx);
768 :
769 0 : catdesc = palloc_object(crosstab_cat_desc);
770 0 : catdesc->catname = catname;
771 0 : catdesc->attidx = i;
772 :
773 : /* Add the proc description block to the hashtable */
774 0 : crosstab_HashTableInsert(crosstab_hash, catdesc);
775 :
776 0 : MemoryContextSwitchTo(SPIcontext);
777 0 : }
778 0 : }
779 :
780 0 : if (SPI_finish() != SPI_OK_FINISH)
781 : /* internal error */
782 0 : elog(ERROR, "load_categories_hash: SPI_finish() failed");
783 :
784 0 : return crosstab_hash;
785 0 : }
786 :
787 : /*
788 : * create and populate the crosstab tuplestore using the provided source query
789 : */
790 : static Tuplestorestate *
791 0 : get_crosstab_tuplestore(char *sql,
792 : HTAB *crosstab_hash,
793 : TupleDesc tupdesc,
794 : bool randomAccess)
795 : {
796 0 : Tuplestorestate *tupstore;
797 0 : int num_categories = hash_get_num_entries(crosstab_hash);
798 0 : AttInMetadata *attinmeta = TupleDescGetAttInMetadata(tupdesc);
799 0 : char **values;
800 0 : HeapTuple tuple;
801 0 : int ret;
802 0 : uint64 proc;
803 :
804 : /* initialize our tuplestore (while still in query context!) */
805 0 : tupstore = tuplestore_begin_heap(randomAccess, false, work_mem);
806 :
807 : /* Connect to SPI manager */
808 0 : SPI_connect();
809 :
810 : /* Now retrieve the crosstab source rows */
811 0 : ret = SPI_execute(sql, true, 0);
812 0 : proc = SPI_processed;
813 :
814 : /* Check for qualifying tuples */
815 0 : if ((ret == SPI_OK_SELECT) && (proc > 0))
816 : {
817 0 : SPITupleTable *spi_tuptable = SPI_tuptable;
818 0 : TupleDesc spi_tupdesc = spi_tuptable->tupdesc;
819 0 : int ncols = spi_tupdesc->natts;
820 0 : char *rowid;
821 0 : char *lastrowid = NULL;
822 0 : bool firstpass = true;
823 0 : uint64 i;
824 0 : int j;
825 0 : int result_ncols;
826 :
827 0 : if (num_categories == 0)
828 : {
829 : /* no qualifying category tuples */
830 0 : ereport(ERROR,
831 : (errcode(ERRCODE_CARDINALITY_VIOLATION),
832 : errmsg("crosstab categories query must return at least one row")));
833 0 : }
834 :
835 : /*
836 : * The provided SQL query must always return at least three columns:
837 : *
838 : * 1. rowname the label for each row - column 1 in the final result
839 : * 2. category the label for each value-column in the final result 3.
840 : * value the values used to populate the value-columns
841 : *
842 : * If there are more than three columns, the last two are taken as
843 : * "category" and "values". The first column is taken as "rowname".
844 : * Additional columns (2 thru N-2) are assumed the same for the same
845 : * "rowname", and are copied into the result tuple from the first time
846 : * we encounter a particular rowname.
847 : */
848 0 : if (ncols < 3)
849 0 : ereport(ERROR,
850 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
851 : errmsg("invalid crosstab source data query"),
852 : errdetail("The query must return at least 3 columns: row_name, category, and value.")));
853 :
854 0 : result_ncols = (ncols - 2) + num_categories;
855 :
856 : /* Recheck to make sure output tuple descriptor looks reasonable */
857 0 : if (tupdesc->natts != result_ncols)
858 0 : ereport(ERROR,
859 : (errcode(ERRCODE_DATATYPE_MISMATCH),
860 : errmsg("invalid crosstab return type"),
861 : errdetail("Return row must have %d columns, not %d.",
862 : result_ncols, tupdesc->natts)));
863 :
864 : /* allocate space and make sure it's clear */
865 0 : values = (char **) palloc0(result_ncols * sizeof(char *));
866 :
867 0 : for (i = 0; i < proc; i++)
868 : {
869 0 : HeapTuple spi_tuple;
870 0 : crosstab_cat_desc *catdesc;
871 0 : char *catname;
872 :
873 : /* get the next sql result tuple */
874 0 : spi_tuple = spi_tuptable->vals[i];
875 :
876 : /* get the rowid from the current sql result tuple */
877 0 : rowid = SPI_getvalue(spi_tuple, spi_tupdesc, 1);
878 :
879 : /*
880 : * if we're on a new output row, grab the column values up to
881 : * column N-2 now
882 : */
883 0 : if (firstpass || !xstreq(lastrowid, rowid))
884 : {
885 : /*
886 : * a new row means we need to flush the old one first, unless
887 : * we're on the very first row
888 : */
889 0 : if (!firstpass)
890 : {
891 : /* rowid changed, flush the previous output row */
892 0 : tuple = BuildTupleFromCStrings(attinmeta, values);
893 :
894 0 : tuplestore_puttuple(tupstore, tuple);
895 :
896 0 : for (j = 0; j < result_ncols; j++)
897 0 : xpfree(values[j]);
898 0 : }
899 :
900 0 : values[0] = rowid;
901 0 : for (j = 1; j < ncols - 2; j++)
902 0 : values[j] = SPI_getvalue(spi_tuple, spi_tupdesc, j + 1);
903 :
904 : /* we're no longer on the first pass */
905 0 : firstpass = false;
906 0 : }
907 :
908 : /* look up the category and fill in the appropriate column */
909 0 : catname = SPI_getvalue(spi_tuple, spi_tupdesc, ncols - 1);
910 :
911 0 : if (catname != NULL)
912 : {
913 0 : crosstab_HashTableLookup(crosstab_hash, catname, catdesc);
914 :
915 0 : if (catdesc)
916 0 : values[catdesc->attidx + ncols - 2] =
917 0 : SPI_getvalue(spi_tuple, spi_tupdesc, ncols);
918 0 : }
919 :
920 0 : xpfree(lastrowid);
921 0 : xpstrdup(lastrowid, rowid);
922 0 : }
923 :
924 : /* flush the last output row */
925 0 : tuple = BuildTupleFromCStrings(attinmeta, values);
926 :
927 0 : tuplestore_puttuple(tupstore, tuple);
928 0 : }
929 :
930 0 : if (SPI_finish() != SPI_OK_FINISH)
931 : /* internal error */
932 0 : elog(ERROR, "get_crosstab_tuplestore: SPI_finish() failed");
933 :
934 0 : return tupstore;
935 0 : }
936 :
937 : /*
938 : * connectby_text - produce a result set from a hierarchical (parent/child)
939 : * table.
940 : *
941 : * e.g. given table foo:
942 : *
943 : * keyid parent_keyid pos
944 : * ------+------------+--
945 : * row1 NULL 0
946 : * row2 row1 0
947 : * row3 row1 0
948 : * row4 row2 1
949 : * row5 row2 0
950 : * row6 row4 0
951 : * row7 row3 0
952 : * row8 row6 0
953 : * row9 row5 0
954 : *
955 : *
956 : * connectby(text relname, text keyid_fld, text parent_keyid_fld
957 : * [, text orderby_fld], text start_with, int max_depth
958 : * [, text branch_delim])
959 : * connectby('foo', 'keyid', 'parent_keyid', 'pos', 'row2', 0, '~') returns:
960 : *
961 : * keyid parent_id level branch serial
962 : * ------+-----------+--------+-----------------------
963 : * row2 NULL 0 row2 1
964 : * row5 row2 1 row2~row5 2
965 : * row9 row5 2 row2~row5~row9 3
966 : * row4 row2 1 row2~row4 4
967 : * row6 row4 2 row2~row4~row6 5
968 : * row8 row6 3 row2~row4~row6~row8 6
969 : *
970 : */
971 0 : PG_FUNCTION_INFO_V1(connectby_text);
972 :
973 : #define CONNECTBY_NCOLS 4
974 : #define CONNECTBY_NCOLS_NOBRANCH 3
975 :
976 : Datum
977 0 : connectby_text(PG_FUNCTION_ARGS)
978 : {
979 0 : char *relname = text_to_cstring(PG_GETARG_TEXT_PP(0));
980 0 : char *key_fld = text_to_cstring(PG_GETARG_TEXT_PP(1));
981 0 : char *parent_key_fld = text_to_cstring(PG_GETARG_TEXT_PP(2));
982 0 : char *start_with = text_to_cstring(PG_GETARG_TEXT_PP(3));
983 0 : int max_depth = PG_GETARG_INT32(4);
984 0 : char *branch_delim = NULL;
985 0 : bool show_branch = false;
986 0 : bool show_serial = false;
987 0 : ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
988 0 : TupleDesc tupdesc;
989 0 : AttInMetadata *attinmeta;
990 0 : MemoryContext per_query_ctx;
991 0 : MemoryContext oldcontext;
992 :
993 : /* check to see if caller supports us returning a tuplestore */
994 0 : if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
995 0 : ereport(ERROR,
996 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
997 : errmsg("set-valued function called in context that cannot accept a set")));
998 0 : if (!(rsinfo->allowedModes & SFRM_Materialize) ||
999 0 : rsinfo->expectedDesc == NULL)
1000 0 : ereport(ERROR,
1001 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1002 : errmsg("materialize mode required, but it is not allowed in this context")));
1003 :
1004 0 : if (fcinfo->nargs == 6)
1005 : {
1006 0 : branch_delim = text_to_cstring(PG_GETARG_TEXT_PP(5));
1007 0 : show_branch = true;
1008 0 : }
1009 : else
1010 : /* default is no show, tilde for the delimiter */
1011 0 : branch_delim = pstrdup("~");
1012 :
1013 0 : per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
1014 0 : oldcontext = MemoryContextSwitchTo(per_query_ctx);
1015 :
1016 : /* get the requested return tuple description */
1017 0 : tupdesc = CreateTupleDescCopy(rsinfo->expectedDesc);
1018 :
1019 : /* does it meet our needs */
1020 0 : validateConnectbyTupleDesc(tupdesc, show_branch, show_serial);
1021 :
1022 : /* OK, use it then */
1023 0 : attinmeta = TupleDescGetAttInMetadata(tupdesc);
1024 :
1025 : /* OK, go to work */
1026 0 : rsinfo->returnMode = SFRM_Materialize;
1027 0 : rsinfo->setResult = connectby(relname,
1028 0 : key_fld,
1029 0 : parent_key_fld,
1030 : NULL,
1031 0 : branch_delim,
1032 0 : start_with,
1033 0 : max_depth,
1034 0 : show_branch,
1035 0 : show_serial,
1036 0 : per_query_ctx,
1037 0 : rsinfo->allowedModes & SFRM_Materialize_Random,
1038 0 : attinmeta);
1039 0 : rsinfo->setDesc = tupdesc;
1040 :
1041 0 : MemoryContextSwitchTo(oldcontext);
1042 :
1043 : /*
1044 : * SFRM_Materialize mode expects us to return a NULL Datum. The actual
1045 : * tuples are in our tuplestore and passed back through rsinfo->setResult.
1046 : * rsinfo->setDesc is set to the tuple description that we actually used
1047 : * to build our tuples with, so the caller can verify we did what it was
1048 : * expecting.
1049 : */
1050 0 : return (Datum) 0;
1051 0 : }
1052 :
1053 0 : PG_FUNCTION_INFO_V1(connectby_text_serial);
1054 : Datum
1055 0 : connectby_text_serial(PG_FUNCTION_ARGS)
1056 : {
1057 0 : char *relname = text_to_cstring(PG_GETARG_TEXT_PP(0));
1058 0 : char *key_fld = text_to_cstring(PG_GETARG_TEXT_PP(1));
1059 0 : char *parent_key_fld = text_to_cstring(PG_GETARG_TEXT_PP(2));
1060 0 : char *orderby_fld = text_to_cstring(PG_GETARG_TEXT_PP(3));
1061 0 : char *start_with = text_to_cstring(PG_GETARG_TEXT_PP(4));
1062 0 : int max_depth = PG_GETARG_INT32(5);
1063 0 : char *branch_delim = NULL;
1064 0 : bool show_branch = false;
1065 0 : bool show_serial = true;
1066 0 : ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
1067 0 : TupleDesc tupdesc;
1068 0 : AttInMetadata *attinmeta;
1069 0 : MemoryContext per_query_ctx;
1070 0 : MemoryContext oldcontext;
1071 :
1072 : /* check to see if caller supports us returning a tuplestore */
1073 0 : if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
1074 0 : ereport(ERROR,
1075 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1076 : errmsg("set-valued function called in context that cannot accept a set")));
1077 0 : if (!(rsinfo->allowedModes & SFRM_Materialize) ||
1078 0 : rsinfo->expectedDesc == NULL)
1079 0 : ereport(ERROR,
1080 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1081 : errmsg("materialize mode required, but it is not allowed in this context")));
1082 :
1083 0 : if (fcinfo->nargs == 7)
1084 : {
1085 0 : branch_delim = text_to_cstring(PG_GETARG_TEXT_PP(6));
1086 0 : show_branch = true;
1087 0 : }
1088 : else
1089 : /* default is no show, tilde for the delimiter */
1090 0 : branch_delim = pstrdup("~");
1091 :
1092 0 : per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
1093 0 : oldcontext = MemoryContextSwitchTo(per_query_ctx);
1094 :
1095 : /* get the requested return tuple description */
1096 0 : tupdesc = CreateTupleDescCopy(rsinfo->expectedDesc);
1097 :
1098 : /* does it meet our needs */
1099 0 : validateConnectbyTupleDesc(tupdesc, show_branch, show_serial);
1100 :
1101 : /* OK, use it then */
1102 0 : attinmeta = TupleDescGetAttInMetadata(tupdesc);
1103 :
1104 : /* OK, go to work */
1105 0 : rsinfo->returnMode = SFRM_Materialize;
1106 0 : rsinfo->setResult = connectby(relname,
1107 0 : key_fld,
1108 0 : parent_key_fld,
1109 0 : orderby_fld,
1110 0 : branch_delim,
1111 0 : start_with,
1112 0 : max_depth,
1113 0 : show_branch,
1114 0 : show_serial,
1115 0 : per_query_ctx,
1116 0 : rsinfo->allowedModes & SFRM_Materialize_Random,
1117 0 : attinmeta);
1118 0 : rsinfo->setDesc = tupdesc;
1119 :
1120 0 : MemoryContextSwitchTo(oldcontext);
1121 :
1122 : /*
1123 : * SFRM_Materialize mode expects us to return a NULL Datum. The actual
1124 : * tuples are in our tuplestore and passed back through rsinfo->setResult.
1125 : * rsinfo->setDesc is set to the tuple description that we actually used
1126 : * to build our tuples with, so the caller can verify we did what it was
1127 : * expecting.
1128 : */
1129 0 : return (Datum) 0;
1130 0 : }
1131 :
1132 :
1133 : /*
1134 : * connectby - does the real work for connectby_text()
1135 : */
1136 : static Tuplestorestate *
1137 0 : connectby(char *relname,
1138 : char *key_fld,
1139 : char *parent_key_fld,
1140 : char *orderby_fld,
1141 : char *branch_delim,
1142 : char *start_with,
1143 : int max_depth,
1144 : bool show_branch,
1145 : bool show_serial,
1146 : MemoryContext per_query_ctx,
1147 : bool randomAccess,
1148 : AttInMetadata *attinmeta)
1149 : {
1150 0 : Tuplestorestate *tupstore = NULL;
1151 0 : MemoryContext oldcontext;
1152 0 : int serial = 1;
1153 :
1154 : /* Connect to SPI manager */
1155 0 : SPI_connect();
1156 :
1157 : /* switch to longer term context to create the tuple store */
1158 0 : oldcontext = MemoryContextSwitchTo(per_query_ctx);
1159 :
1160 : /* initialize our tuplestore */
1161 0 : tupstore = tuplestore_begin_heap(randomAccess, false, work_mem);
1162 :
1163 0 : MemoryContextSwitchTo(oldcontext);
1164 :
1165 : /* now go get the whole tree */
1166 0 : build_tuplestore_recursively(key_fld,
1167 0 : parent_key_fld,
1168 0 : relname,
1169 0 : orderby_fld,
1170 0 : branch_delim,
1171 0 : start_with,
1172 0 : start_with, /* current_branch */
1173 : 0, /* initial level is 0 */
1174 : &serial, /* initial serial is 1 */
1175 0 : max_depth,
1176 0 : show_branch,
1177 0 : show_serial,
1178 0 : per_query_ctx,
1179 0 : attinmeta,
1180 0 : tupstore);
1181 :
1182 0 : SPI_finish();
1183 :
1184 0 : return tupstore;
1185 0 : }
1186 :
1187 : static void
1188 0 : build_tuplestore_recursively(char *key_fld,
1189 : char *parent_key_fld,
1190 : char *relname,
1191 : char *orderby_fld,
1192 : char *branch_delim,
1193 : char *start_with,
1194 : char *branch,
1195 : int level,
1196 : int *serial,
1197 : int max_depth,
1198 : bool show_branch,
1199 : bool show_serial,
1200 : MemoryContext per_query_ctx,
1201 : AttInMetadata *attinmeta,
1202 : Tuplestorestate *tupstore)
1203 : {
1204 0 : TupleDesc tupdesc = attinmeta->tupdesc;
1205 0 : int ret;
1206 0 : uint64 proc;
1207 0 : int serial_column;
1208 0 : StringInfoData sql;
1209 0 : char **values;
1210 0 : char *current_key;
1211 0 : char *current_key_parent;
1212 0 : char current_level[INT32_STRLEN];
1213 0 : char serial_str[INT32_STRLEN];
1214 0 : char *current_branch;
1215 0 : HeapTuple tuple;
1216 :
1217 0 : if (max_depth > 0 && level > max_depth)
1218 0 : return;
1219 :
1220 0 : initStringInfo(&sql);
1221 :
1222 : /* Build initial sql statement */
1223 0 : if (!show_serial)
1224 : {
1225 0 : appendStringInfo(&sql, "SELECT %s, %s FROM %s WHERE %s = %s AND %s IS NOT NULL AND %s <> %s",
1226 0 : key_fld,
1227 0 : parent_key_fld,
1228 0 : relname,
1229 0 : parent_key_fld,
1230 0 : quote_literal_cstr(start_with),
1231 0 : key_fld, key_fld, parent_key_fld);
1232 0 : serial_column = 0;
1233 0 : }
1234 : else
1235 : {
1236 0 : appendStringInfo(&sql, "SELECT %s, %s FROM %s WHERE %s = %s AND %s IS NOT NULL AND %s <> %s ORDER BY %s",
1237 0 : key_fld,
1238 0 : parent_key_fld,
1239 0 : relname,
1240 0 : parent_key_fld,
1241 0 : quote_literal_cstr(start_with),
1242 0 : key_fld, key_fld, parent_key_fld,
1243 0 : orderby_fld);
1244 0 : serial_column = 1;
1245 : }
1246 :
1247 0 : if (show_branch)
1248 0 : values = (char **) palloc((CONNECTBY_NCOLS + serial_column) * sizeof(char *));
1249 : else
1250 0 : values = (char **) palloc((CONNECTBY_NCOLS_NOBRANCH + serial_column) * sizeof(char *));
1251 :
1252 : /* First time through, do a little setup */
1253 0 : if (level == 0)
1254 : {
1255 : /* root value is the one we initially start with */
1256 0 : values[0] = start_with;
1257 :
1258 : /* root value has no parent */
1259 0 : values[1] = NULL;
1260 :
1261 : /* root level is 0 */
1262 0 : sprintf(current_level, "%d", level);
1263 0 : values[2] = current_level;
1264 :
1265 : /* root branch is just starting root value */
1266 0 : if (show_branch)
1267 0 : values[3] = start_with;
1268 :
1269 : /* root starts the serial with 1 */
1270 0 : if (show_serial)
1271 : {
1272 0 : sprintf(serial_str, "%d", (*serial)++);
1273 0 : if (show_branch)
1274 0 : values[4] = serial_str;
1275 : else
1276 0 : values[3] = serial_str;
1277 0 : }
1278 :
1279 : /* construct the tuple */
1280 0 : tuple = BuildTupleFromCStrings(attinmeta, values);
1281 :
1282 : /* now store it */
1283 0 : tuplestore_puttuple(tupstore, tuple);
1284 :
1285 : /* increment level */
1286 0 : level++;
1287 0 : }
1288 :
1289 : /* Retrieve the desired rows */
1290 0 : ret = SPI_execute(sql.data, true, 0);
1291 0 : proc = SPI_processed;
1292 :
1293 : /* Check for qualifying tuples */
1294 0 : if ((ret == SPI_OK_SELECT) && (proc > 0))
1295 : {
1296 0 : HeapTuple spi_tuple;
1297 0 : SPITupleTable *tuptable = SPI_tuptable;
1298 0 : TupleDesc spi_tupdesc = tuptable->tupdesc;
1299 0 : uint64 i;
1300 0 : StringInfoData branchstr;
1301 0 : StringInfoData chk_branchstr;
1302 0 : StringInfoData chk_current_key;
1303 :
1304 : /*
1305 : * Check that return tupdesc is compatible with the one we got from
1306 : * the query.
1307 : */
1308 0 : compatConnectbyTupleDescs(tupdesc, spi_tupdesc);
1309 :
1310 0 : initStringInfo(&branchstr);
1311 0 : initStringInfo(&chk_branchstr);
1312 0 : initStringInfo(&chk_current_key);
1313 :
1314 0 : for (i = 0; i < proc; i++)
1315 : {
1316 : /* initialize branch for this pass */
1317 0 : appendStringInfoString(&branchstr, branch);
1318 0 : appendStringInfo(&chk_branchstr, "%s%s%s", branch_delim, branch, branch_delim);
1319 :
1320 : /* get the next sql result tuple */
1321 0 : spi_tuple = tuptable->vals[i];
1322 :
1323 : /* get the current key (might be NULL) */
1324 0 : current_key = SPI_getvalue(spi_tuple, spi_tupdesc, 1);
1325 :
1326 : /* get the parent key (might be NULL) */
1327 0 : current_key_parent = SPI_getvalue(spi_tuple, spi_tupdesc, 2);
1328 :
1329 : /* get the current level */
1330 0 : sprintf(current_level, "%d", level);
1331 :
1332 : /* check to see if this key is also an ancestor */
1333 0 : if (current_key)
1334 : {
1335 0 : appendStringInfo(&chk_current_key, "%s%s%s",
1336 0 : branch_delim, current_key, branch_delim);
1337 0 : if (strstr(chk_branchstr.data, chk_current_key.data))
1338 0 : ereport(ERROR,
1339 : (errcode(ERRCODE_INVALID_RECURSION),
1340 : errmsg("infinite recursion detected")));
1341 0 : }
1342 :
1343 : /* OK, extend the branch */
1344 0 : if (current_key)
1345 0 : appendStringInfo(&branchstr, "%s%s", branch_delim, current_key);
1346 0 : current_branch = branchstr.data;
1347 :
1348 : /* build a tuple */
1349 0 : values[0] = current_key;
1350 0 : values[1] = current_key_parent;
1351 0 : values[2] = current_level;
1352 0 : if (show_branch)
1353 0 : values[3] = current_branch;
1354 0 : if (show_serial)
1355 : {
1356 0 : sprintf(serial_str, "%d", (*serial)++);
1357 0 : if (show_branch)
1358 0 : values[4] = serial_str;
1359 : else
1360 0 : values[3] = serial_str;
1361 0 : }
1362 :
1363 0 : tuple = BuildTupleFromCStrings(attinmeta, values);
1364 :
1365 : /* store the tuple for later use */
1366 0 : tuplestore_puttuple(tupstore, tuple);
1367 :
1368 0 : heap_freetuple(tuple);
1369 :
1370 : /* recurse using current_key as the new start_with */
1371 0 : if (current_key)
1372 0 : build_tuplestore_recursively(key_fld,
1373 0 : parent_key_fld,
1374 0 : relname,
1375 0 : orderby_fld,
1376 0 : branch_delim,
1377 0 : current_key,
1378 0 : current_branch,
1379 0 : level + 1,
1380 0 : serial,
1381 0 : max_depth,
1382 0 : show_branch,
1383 0 : show_serial,
1384 0 : per_query_ctx,
1385 0 : attinmeta,
1386 0 : tupstore);
1387 :
1388 0 : xpfree(current_key);
1389 0 : xpfree(current_key_parent);
1390 :
1391 : /* reset branch for next pass */
1392 0 : resetStringInfo(&branchstr);
1393 0 : resetStringInfo(&chk_branchstr);
1394 0 : resetStringInfo(&chk_current_key);
1395 0 : }
1396 :
1397 0 : xpfree(branchstr.data);
1398 0 : xpfree(chk_branchstr.data);
1399 0 : xpfree(chk_current_key.data);
1400 0 : }
1401 0 : }
1402 :
1403 : /*
1404 : * Check expected (query runtime) tupdesc suitable for Connectby
1405 : */
1406 : static void
1407 0 : validateConnectbyTupleDesc(TupleDesc td, bool show_branch, bool show_serial)
1408 : {
1409 0 : int expected_cols;
1410 :
1411 : /* are there the correct number of columns */
1412 0 : if (show_branch)
1413 0 : expected_cols = CONNECTBY_NCOLS;
1414 : else
1415 0 : expected_cols = CONNECTBY_NCOLS_NOBRANCH;
1416 0 : if (show_serial)
1417 0 : expected_cols++;
1418 :
1419 0 : if (td->natts != expected_cols)
1420 0 : ereport(ERROR,
1421 : (errcode(ERRCODE_DATATYPE_MISMATCH),
1422 : errmsg("invalid connectby return type"),
1423 : errdetail("Return row must have %d columns, not %d.",
1424 : expected_cols, td->natts)));
1425 :
1426 : /* the first two columns will be checked against the input tuples later */
1427 :
1428 : /* check that the type of the third column is INT4 */
1429 0 : if (TupleDescAttr(td, 2)->atttypid != INT4OID)
1430 0 : ereport(ERROR,
1431 : (errcode(ERRCODE_DATATYPE_MISMATCH),
1432 : errmsg("invalid connectby return type"),
1433 : errdetail("Third return column (depth) must be type %s.",
1434 : format_type_be(INT4OID))));
1435 :
1436 : /* check that the type of the branch column is TEXT if applicable */
1437 0 : if (show_branch && TupleDescAttr(td, 3)->atttypid != TEXTOID)
1438 0 : ereport(ERROR,
1439 : (errcode(ERRCODE_DATATYPE_MISMATCH),
1440 : errmsg("invalid connectby return type"),
1441 : errdetail("Fourth return column (branch) must be type %s.",
1442 : format_type_be(TEXTOID))));
1443 :
1444 : /* check that the type of the serial column is INT4 if applicable */
1445 0 : if (show_branch && show_serial &&
1446 0 : TupleDescAttr(td, 4)->atttypid != INT4OID)
1447 0 : ereport(ERROR,
1448 : (errcode(ERRCODE_DATATYPE_MISMATCH),
1449 : errmsg("invalid connectby return type"),
1450 : errdetail("Fifth return column (serial) must be type %s.",
1451 : format_type_be(INT4OID))));
1452 0 : if (!show_branch && show_serial &&
1453 0 : TupleDescAttr(td, 3)->atttypid != INT4OID)
1454 0 : ereport(ERROR,
1455 : (errcode(ERRCODE_DATATYPE_MISMATCH),
1456 : errmsg("invalid connectby return type"),
1457 : errdetail("Fourth return column (serial) must be type %s.",
1458 : format_type_be(INT4OID))));
1459 :
1460 : /* OK, the tupdesc is valid for our purposes */
1461 0 : }
1462 :
1463 : /*
1464 : * Check if output tupdesc and SQL query's tupdesc are compatible
1465 : */
1466 : static void
1467 0 : compatConnectbyTupleDescs(TupleDesc ret_tupdesc, TupleDesc sql_tupdesc)
1468 : {
1469 0 : Oid ret_atttypid;
1470 0 : Oid sql_atttypid;
1471 0 : int32 ret_atttypmod;
1472 0 : int32 sql_atttypmod;
1473 :
1474 : /*
1475 : * Query result must have at least 2 columns.
1476 : */
1477 0 : if (sql_tupdesc->natts < 2)
1478 0 : ereport(ERROR,
1479 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1480 : errmsg("invalid connectby source data query"),
1481 : errdetail("The query must return at least two columns.")));
1482 :
1483 : /*
1484 : * These columns must match the result type indicated by the calling
1485 : * query.
1486 : */
1487 0 : ret_atttypid = TupleDescAttr(ret_tupdesc, 0)->atttypid;
1488 0 : sql_atttypid = TupleDescAttr(sql_tupdesc, 0)->atttypid;
1489 0 : ret_atttypmod = TupleDescAttr(ret_tupdesc, 0)->atttypmod;
1490 0 : sql_atttypmod = TupleDescAttr(sql_tupdesc, 0)->atttypmod;
1491 0 : if (ret_atttypid != sql_atttypid ||
1492 0 : (ret_atttypmod >= 0 && ret_atttypmod != sql_atttypmod))
1493 0 : ereport(ERROR,
1494 : (errcode(ERRCODE_DATATYPE_MISMATCH),
1495 : errmsg("invalid connectby return type"),
1496 : errdetail("Source key type %s does not match return key type %s.",
1497 : format_type_with_typemod(sql_atttypid, sql_atttypmod),
1498 : format_type_with_typemod(ret_atttypid, ret_atttypmod))));
1499 :
1500 0 : ret_atttypid = TupleDescAttr(ret_tupdesc, 1)->atttypid;
1501 0 : sql_atttypid = TupleDescAttr(sql_tupdesc, 1)->atttypid;
1502 0 : ret_atttypmod = TupleDescAttr(ret_tupdesc, 1)->atttypmod;
1503 0 : sql_atttypmod = TupleDescAttr(sql_tupdesc, 1)->atttypmod;
1504 0 : if (ret_atttypid != sql_atttypid ||
1505 0 : (ret_atttypmod >= 0 && ret_atttypmod != sql_atttypmod))
1506 0 : ereport(ERROR,
1507 : (errcode(ERRCODE_DATATYPE_MISMATCH),
1508 : errmsg("invalid connectby return type"),
1509 : errdetail("Source parent key type %s does not match return parent key type %s.",
1510 : format_type_with_typemod(sql_atttypid, sql_atttypmod),
1511 : format_type_with_typemod(ret_atttypid, ret_atttypmod))));
1512 :
1513 : /* OK, the two tupdescs are compatible for our purposes */
1514 0 : }
1515 :
1516 : /*
1517 : * Check if crosstab output tupdesc agrees with input tupdesc
1518 : */
1519 : static void
1520 0 : compatCrosstabTupleDescs(TupleDesc ret_tupdesc, TupleDesc sql_tupdesc)
1521 : {
1522 0 : int i;
1523 0 : Oid ret_atttypid;
1524 0 : Oid sql_atttypid;
1525 0 : int32 ret_atttypmod;
1526 0 : int32 sql_atttypmod;
1527 :
1528 0 : if (ret_tupdesc->natts < 2)
1529 0 : ereport(ERROR,
1530 : (errcode(ERRCODE_DATATYPE_MISMATCH),
1531 : errmsg("invalid crosstab return type"),
1532 : errdetail("Return row must have at least two columns.")));
1533 0 : Assert(sql_tupdesc->natts == 3); /* already checked by caller */
1534 :
1535 : /* check the row_name types match */
1536 0 : ret_atttypid = TupleDescAttr(ret_tupdesc, 0)->atttypid;
1537 0 : sql_atttypid = TupleDescAttr(sql_tupdesc, 0)->atttypid;
1538 0 : ret_atttypmod = TupleDescAttr(ret_tupdesc, 0)->atttypmod;
1539 0 : sql_atttypmod = TupleDescAttr(sql_tupdesc, 0)->atttypmod;
1540 0 : if (ret_atttypid != sql_atttypid ||
1541 0 : (ret_atttypmod >= 0 && ret_atttypmod != sql_atttypmod))
1542 0 : ereport(ERROR,
1543 : (errcode(ERRCODE_DATATYPE_MISMATCH),
1544 : errmsg("invalid crosstab return type"),
1545 : errdetail("Source row_name datatype %s does not match return row_name datatype %s.",
1546 : format_type_with_typemod(sql_atttypid, sql_atttypmod),
1547 : format_type_with_typemod(ret_atttypid, ret_atttypmod))));
1548 :
1549 : /*
1550 : * attribute [1] of sql tuple is the category; no need to check it
1551 : * attribute [2] of sql tuple should match attributes [1] to [natts - 1]
1552 : * of the return tuple
1553 : */
1554 0 : sql_atttypid = TupleDescAttr(sql_tupdesc, 2)->atttypid;
1555 0 : sql_atttypmod = TupleDescAttr(sql_tupdesc, 2)->atttypmod;
1556 0 : for (i = 1; i < ret_tupdesc->natts; i++)
1557 : {
1558 0 : ret_atttypid = TupleDescAttr(ret_tupdesc, i)->atttypid;
1559 0 : ret_atttypmod = TupleDescAttr(ret_tupdesc, i)->atttypmod;
1560 :
1561 0 : if (ret_atttypid != sql_atttypid ||
1562 0 : (ret_atttypmod >= 0 && ret_atttypmod != sql_atttypmod))
1563 0 : ereport(ERROR,
1564 : (errcode(ERRCODE_DATATYPE_MISMATCH),
1565 : errmsg("invalid crosstab return type"),
1566 : errdetail("Source value datatype %s does not match return value datatype %s in column %d.",
1567 : format_type_with_typemod(sql_atttypid, sql_atttypmod),
1568 : format_type_with_typemod(ret_atttypid, ret_atttypmod),
1569 : i + 1)));
1570 0 : }
1571 :
1572 : /* OK, the two tupdescs are compatible for our purposes */
1573 0 : }
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