PostgreSQL Source Code git master
Data Structures | Typedefs | Functions
crosstabview.c File Reference
#include "postgres_fe.h"
#include "common.h"
#include "common/int.h"
#include "common/logging.h"
#include "crosstabview.h"
#include "pqexpbuffer.h"
#include "psqlscanslash.h"
#include "settings.h"
Include dependency graph for crosstabview.c:

Go to the source code of this file.

Data Structures

struct   _pivot_field
 
struct   _avl_node
 
struct   _avl_tree
 

Typedefs

typedef struct _pivot_field  pivot_field
 
typedef struct _avl_node  avl_node
 
typedef struct _avl_tree  avl_tree
 

Functions

static bool  printCrosstab (const PGresult *result, int num_columns, pivot_field *piv_columns, int field_for_columns, int num_rows, pivot_field *piv_rows, int field_for_rows, int field_for_data)
 
static void  avlInit (avl_tree *tree)
 
static void  avlMergeValue (avl_tree *tree, char *name, char *sort_value)
 
static int  avlCollectFields (avl_tree *tree, avl_node *node, pivot_field *fields, int idx)
 
static void  avlFree (avl_tree *tree, avl_node *node)
 
static void  rankSort (int num_columns, pivot_field *piv_columns)
 
static int  indexOfColumn (char *arg, const PGresult *res)
 
static int  pivotFieldCompare (const void *a, const void *b)
 
static int  rankCompare (const void *a, const void *b)
 
bool  PrintResultInCrosstab (const PGresult *res)
 
static void  avlUpdateHeight (avl_node *n)
 
static avl_node *  avlRotate (avl_node **current, int dir)
 
static int  avlBalance (avl_node *n)
 
static void  avlAdjustBalance (avl_tree *tree, avl_node **node)
 
static void  avlInsertNode (avl_tree *tree, avl_node **node, pivot_field field)
 

Typedef Documentation

◆ avl_node

typedef struct _avl_node avl_node

◆ avl_tree

typedef struct _avl_tree avl_tree

◆ pivot_field

typedef struct _pivot_field pivot_field

Function Documentation

◆ avlAdjustBalance()

static void avlAdjustBalance ( avl_tree *  tree,
avl_node **  node 
)
static

Definition at line 506 of file crosstabview.c.

507{
508 avl_node *current = *node;
509 int b = avlBalance(current) / 2;
510
511 if (b != 0)
512 {
513 int dir = (1 - b) / 2;
514
515 if (avlBalance(current->children[dir]) == -b)
516 avlRotate(&current->children[dir], !dir);
517 current = avlRotate(node, dir);
518 }
519 if (current != tree->end)
520 avlUpdateHeight(current);
521}
static void avlUpdateHeight(avl_node *n)
Definition: crosstabview.c:472
static int avlBalance(avl_node *n)
Definition: crosstabview.c:495
static avl_node * avlRotate(avl_node **current, int dir)
Definition: crosstabview.c:481
b
int b
Definition: isn.c:74
tree
Definition: radixtree.h:1828
Definition: crosstabview.c:51
struct _avl_node * children[2]
Definition: crosstabview.c:66

References avlBalance(), avlRotate(), avlUpdateHeight(), b, _avl_node::children, and tree.

Referenced by avlInsertNode().

◆ avlBalance()

static int avlBalance ( avl_node *  n )
static

Definition at line 495 of file crosstabview.c.

496{
497 return n->children[0]->height - n->children[1]->height;
498}
int height
Definition: crosstabview.c:59

References _avl_node::children, and _avl_node::height.

Referenced by avlAdjustBalance().

◆ avlCollectFields()

static int avlCollectFields ( avl_tree *  tree,
avl_node *  node,
pivot_field *  fields,
int  idx 
)
static

Definition at line 577 of file crosstabview.c.

578{
579 if (node == tree->end)
580 return idx;
581
582 idx = avlCollectFields(tree, node->children[0], fields, idx);
583 fields[idx] = node->field;
584 return avlCollectFields(tree, node->children[1], fields, idx + 1);
585}
Datum idx(PG_FUNCTION_ARGS)
Definition: _int_op.c:262
static int avlCollectFields(avl_tree *tree, avl_node *node, pivot_field *fields, int idx)
Definition: crosstabview.c:577
pivot_field field
Definition: crosstabview.c:53

References avlCollectFields(), _avl_node::children, _avl_node::field, idx(), and tree.

Referenced by avlCollectFields(), and PrintResultInCrosstab().

◆ avlFree()

static void avlFree ( avl_tree *  tree,
avl_node *  node 
)
static

Definition at line 448 of file crosstabview.c.

449{
450 if (node->children[0] != tree->end)
451 {
452 avlFree(tree, node->children[0]);
453 pg_free(node->children[0]);
454 }
455 if (node->children[1] != tree->end)
456 {
457 avlFree(tree, node->children[1]);
458 pg_free(node->children[1]);
459 }
460 if (node == tree->root)
461 {
462 /* free the root separately as it's not child of anything */
463 if (node != tree->end)
464 pg_free(node);
465 /* free the tree->end struct only once and when all else is freed */
466 pg_free(tree->end);
467 }
468}
static void avlFree(avl_tree *tree, avl_node *node)
Definition: crosstabview.c:448
void pg_free(void *ptr)
Definition: fe_memutils.c:105

References avlFree(), _avl_node::children, pg_free(), and tree.

Referenced by avlFree(), and PrintResultInCrosstab().

◆ avlInit()

static void avlInit ( avl_tree *  tree )
static

Definition at line 438 of file crosstabview.c.

439{
440 tree->end = (avl_node *) pg_malloc0(sizeof(avl_node));
441 tree->end->children[0] = tree->end->children[1] = tree->end;
442 tree->count = 0;
443 tree->root = tree->end;
444}
void * pg_malloc0(size_t size)
Definition: fe_memutils.c:53

References pg_malloc0(), and tree.

Referenced by PrintResultInCrosstab().

◆ avlInsertNode()

static void avlInsertNode ( avl_tree *  tree,
avl_node **  node,
pivot_field  field 
)
static

Definition at line 529 of file crosstabview.c.

530{
531 avl_node *current = *node;
532
533 if (current == tree->end)
534 {
535 avl_node *new_node = (avl_node *)
536 pg_malloc(sizeof(avl_node));
537
538 new_node->height = 1;
539 new_node->field = field;
540 new_node->children[0] = new_node->children[1] = tree->end;
541 tree->count++;
542 *node = new_node;
543 }
544 else
545 {
546 int cmp = pivotFieldCompare(&field, &current->field);
547
548 if (cmp != 0)
549 {
551 cmp > 0 ? &current->children[1] : &current->children[0],
552 field);
553 avlAdjustBalance(tree, node);
554 }
555 }
556}
static int pivotFieldCompare(const void *a, const void *b)
Definition: crosstabview.c:695
static void avlInsertNode(avl_tree *tree, avl_node **node, pivot_field field)
Definition: crosstabview.c:529
static void avlAdjustBalance(avl_tree *tree, avl_node **node)
Definition: crosstabview.c:506
void * pg_malloc(size_t size)
Definition: fe_memutils.c:47
static int cmp(const chr *x, const chr *y, size_t len)
Definition: regc_locale.c:743

References avlAdjustBalance(), avlInsertNode(), _avl_node::children, cmp(), _avl_node::field, _avl_node::height, pg_malloc(), pivotFieldCompare(), and tree.

Referenced by avlInsertNode(), and avlMergeValue().

◆ avlMergeValue()

static void avlMergeValue ( avl_tree *  tree,
char *  name,
char *  sort_value 
)
static

Definition at line 560 of file crosstabview.c.

561{
562 pivot_field field;
563
564 field.name = name;
565 field.rank = tree->count;
566 field.sort_value = sort_value;
567 avlInsertNode(tree, &tree->root, field);
568}
Definition: crosstabview.c:23
char * name
Definition: crosstabview.c:29
int rank
Definition: crosstabview.c:46
char * sort_value
Definition: crosstabview.c:37
const char * name

References avlInsertNode(), name, _pivot_field::name, _pivot_field::rank, _pivot_field::sort_value, and tree.

Referenced by PrintResultInCrosstab().

◆ avlRotate()

static avl_node * avlRotate ( avl_node **  current,
int  dir 
)
static

Definition at line 481 of file crosstabview.c.

482{
483 avl_node *before = *current;
484 avl_node *after = (*current)->children[dir];
485
486 *current = after;
487 before->children[dir] = after->children[!dir];
489 after->children[!dir] = before;
490
491 return after;
492}
static int before(chr x, chr y)
Definition: regc_locale.c:488

References avlUpdateHeight(), before(), and _avl_node::children.

Referenced by avlAdjustBalance().

◆ avlUpdateHeight()

static void avlUpdateHeight ( avl_node *  n )
static

Definition at line 472 of file crosstabview.c.

473{
474 n->height = 1 + (n->children[0]->height > n->children[1]->height ?
475 n->children[0]->height :
476 n->children[1]->height);
477}

References _avl_node::children, and _avl_node::height.

Referenced by avlAdjustBalance(), and avlRotate().

◆ indexOfColumn()

static int indexOfColumn ( char *  arg,
const PGresult *  res 
)
static

Definition at line 636 of file crosstabview.c.

637{
638 int idx;
639
640 if (arg[0] && strspn(arg, "0123456789") == strlen(arg))
641 {
642 /* if arg contains only digits, it's a column number */
643 idx = atoi(arg) - 1;
644 if (idx < 0 || idx >= PQnfields(res))
645 {
646 pg_log_error("\\crosstabview: column number %d is out of range 1..%d",
647 idx + 1, PQnfields(res));
648 return -1;
649 }
650 }
651 else
652 {
653 int i;
654
655 /*
656 * Dequote and downcase the column name. By checking for all-digits
657 * before doing this, we can ensure that a quoted name is treated as a
658 * name even if it's all digits.
659 */
661
662 /* Now look for match(es) among res' column names */
663 idx = -1;
664 for (i = 0; i < PQnfields(res); i++)
665 {
666 if (strcmp(arg, PQfname(res, i)) == 0)
667 {
668 if (idx >= 0)
669 {
670 /* another idx was already found for the same name */
671 pg_log_error("\\crosstabview: ambiguous column name: \"%s\"", arg);
672 return -1;
673 }
674 idx = i;
675 }
676 }
677 if (idx == -1)
678 {
679 pg_log_error("\\crosstabview: column name not found: \"%s\"", arg);
680 return -1;
681 }
682 }
683
684 return idx;
685}
i
int i
Definition: isn.c:77
#define PQnfields
Definition: libpq-be-fe.h:252
#define PQfname
Definition: libpq-be-fe.h:256
#define pg_log_error(...)
Definition: logging.h:106
void * arg
void dequote_downcase_identifier(char *str, bool downcase, int encoding)
Definition: psqlscanslash.l:743
PsqlSettings pset
Definition: startup.c:32
int encoding
Definition: settings.h:104

References arg, dequote_downcase_identifier(), _psqlSettings::encoding, i, idx(), pg_log_error, PQfname, PQnfields, and pset.

Referenced by PrintResultInCrosstab().

◆ pivotFieldCompare()

static int pivotFieldCompare ( const void *  a,
const void *  b 
)
static

Definition at line 695 of file crosstabview.c.

696{
697 const pivot_field *pa = (const pivot_field *) a;
698 const pivot_field *pb = (const pivot_field *) b;
699
700 /* test null values */
701 if (!pb->name)
702 return pa->name ? -1 : 0;
703 else if (!pa->name)
704 return 1;
705
706 /* non-null values */
707 return strcmp(pa->name, pb->name);
708}
a
int a
Definition: isn.c:73

References a, b, and _pivot_field::name.

Referenced by avlInsertNode(), and printCrosstab().

◆ printCrosstab()

static bool printCrosstab ( const PGresult *  result,
int  num_columns,
pivot_field *  piv_columns,
int  field_for_columns,
int  num_rows,
pivot_field *  piv_rows,
int  field_for_rows,
int  field_for_data 
)
static

Definition at line 286 of file crosstabview.c.

290{
291 printQueryOpt popt = pset.popt;
293 int i,
294 rn;
295 char col_align;
296 int *horiz_map;
297 bool retval = false;
298
299 printTableInit(&cont, &popt.topt, popt.title, num_columns + 1, num_rows);
300
301 /* Step 1: set target column names (horizontal header) */
302
303 /* The name of the first column is kept unchanged by the pivoting */
305 PQfname(result, field_for_rows),
306 false,
308 field_for_rows)));
309
310 /*
311 * To iterate over piv_columns[] by piv_columns[].rank, create a reverse
312 * map associating each piv_columns[].rank to its index in piv_columns.
313 * This avoids an O(N^2) loop later.
314 */
315 horiz_map = (int *) pg_malloc(sizeof(int) * num_columns);
316 for (i = 0; i < num_columns; i++)
317 horiz_map[piv_columns[i].rank] = i;
318
319 /*
320 * The display alignment depends on its PQftype().
321 */
322 col_align = column_type_alignment(PQftype(result, field_for_data));
323
324 for (i = 0; i < num_columns; i++)
325 {
326 char *colname;
327
328 colname = piv_columns[horiz_map[i]].name ?
329 piv_columns[horiz_map[i]].name :
330 (popt.nullPrint ? popt.nullPrint : "");
331
332 printTableAddHeader(&cont, colname, false, col_align);
333 }
334 pg_free(horiz_map);
335
336 /* Step 2: set row names in the first output column (vertical header) */
337 for (i = 0; i < num_rows; i++)
338 {
339 int k = piv_rows[i].rank;
340
341 cont.cells[k * (num_columns + 1)] = piv_rows[i].name ?
342 piv_rows[i].name :
343 (popt.nullPrint ? popt.nullPrint : "");
344 }
345 cont.cellsadded = num_rows * (num_columns + 1);
346
347 /*
348 * Step 3: fill in the content cells.
349 */
350 for (rn = 0; rn < PQntuples(result); rn++)
351 {
352 int row_number;
353 int col_number;
354 pivot_field *rp,
355 *cp;
356 pivot_field elt;
357
358 /* Find target row */
359 if (!PQgetisnull(result, rn, field_for_rows))
360 elt.name = PQgetvalue(result, rn, field_for_rows);
361 else
362 elt.name = NULL;
363 rp = (pivot_field *) bsearch(&elt,
364 piv_rows,
365 num_rows,
366 sizeof(pivot_field),
368 Assert(rp != NULL);
369 row_number = rp->rank;
370
371 /* Find target column */
372 if (!PQgetisnull(result, rn, field_for_columns))
373 elt.name = PQgetvalue(result, rn, field_for_columns);
374 else
375 elt.name = NULL;
376
377 cp = (pivot_field *) bsearch(&elt,
378 piv_columns,
379 num_columns,
380 sizeof(pivot_field),
382 Assert(cp != NULL);
383 col_number = cp->rank;
384
385 /* Place value into cell */
386 if (col_number >= 0 && row_number >= 0)
387 {
388 int idx;
389
390 /* index into the cont.cells array */
391 idx = 1 + col_number + row_number * (num_columns + 1);
392
393 /*
394 * If the cell already contains a value, raise an error.
395 */
396 if (cont.cells[idx] != NULL)
397 {
398 pg_log_error("\\crosstabview: query result contains multiple data values for row \"%s\", column \"%s\"",
399 rp->name ? rp->name :
400 (popt.nullPrint ? popt.nullPrint : "(null)"),
401 cp->name ? cp->name :
402 (popt.nullPrint ? popt.nullPrint : "(null)"));
403 goto error;
404 }
405
406 cont.cells[idx] = !PQgetisnull(result, rn, field_for_data) ?
407 PQgetvalue(result, rn, field_for_data) :
408 (popt.nullPrint ? popt.nullPrint : "");
409 }
410 }
411
412 /*
413 * The non-initialized cells must be set to an empty string for the print
414 * functions
415 */
416 for (i = 0; i < cont.cellsadded; i++)
417 {
418 if (cont.cells[i] == NULL)
419 cont.cells[i] = "";
420 }
421
422 printTable(&cont, pset.queryFout, false, pset.logfile);
423 retval = true;
424
425error:
426 printTableCleanup(&cont);
427
428 return retval;
429}
Oid PQftype(const PGresult *res, int field_num)
Definition: fe-exec.c:3730
void printTableInit(printTableContent *const content, const printTableOpt *opt, const char *title, const int ncolumns, const int nrows)
Definition: print.c:3172
void printTableCleanup(printTableContent *const content)
Definition: print.c:3353
char column_type_alignment(Oid ftype)
Definition: print.c:3614
void printTable(const printTableContent *cont, FILE *fout, bool is_pager, FILE *flog)
Definition: print.c:3443
void printTableAddHeader(printTableContent *const content, char *header, const bool translate, const char align)
Definition: print.c:3220
Assert(PointerIsAligned(start, uint64))
#define PQgetvalue
Definition: libpq-be-fe.h:253
#define PQgetisnull
Definition: libpq-be-fe.h:255
#define PQntuples
Definition: libpq-be-fe.h:251
static void error(void)
Definition: sql-dyntest.c:147
printQueryOpt popt
Definition: settings.h:112
FILE * logfile
Definition: settings.h:149
FILE * queryFout
Definition: settings.h:105
printTableOpt topt
Definition: print.h:185
char * nullPrint
Definition: print.h:186
char * title
Definition: print.h:187
uint64 cellsadded
Definition: print.h:174
const char ** cells
Definition: print.h:171

References Assert(), printTableContent::cells, printTableContent::cellsadded, column_type_alignment(), error(), i, idx(), _psqlSettings::logfile, name, _pivot_field::name, printQueryOpt::nullPrint, pg_free(), pg_log_error, pg_malloc(), pivotFieldCompare(), _psqlSettings::popt, PQfname, PQftype(), PQgetisnull, PQgetvalue, PQntuples, printTable(), printTableAddHeader(), printTableCleanup(), printTableInit(), pset, _psqlSettings::queryFout, _pivot_field::rank, printQueryOpt::title, and printQueryOpt::topt.

Referenced by PrintResultInCrosstab().

◆ PrintResultInCrosstab()

bool PrintResultInCrosstab ( const PGresult *  res )

Definition at line 104 of file crosstabview.c.

105{
106 bool retval = false;
107 avl_tree piv_columns;
108 avl_tree piv_rows;
109 pivot_field *array_columns = NULL;
110 pivot_field *array_rows = NULL;
111 int num_columns = 0;
112 int num_rows = 0;
113 int field_for_rows;
114 int field_for_columns;
115 int field_for_data;
116 int sort_field_for_columns;
117 int rn;
118
119 avlInit(&piv_rows);
120 avlInit(&piv_columns);
121
123 {
124 pg_log_error("\\crosstabview: statement did not return a result set");
125 goto error_return;
126 }
127
128 if (PQnfields(res) < 3)
129 {
130 pg_log_error("\\crosstabview: query must return at least three columns");
131 goto error_return;
132 }
133
134 /* Process first optional arg (vertical header column) */
135 if (pset.ctv_args[0] == NULL)
136 field_for_rows = 0;
137 else
138 {
139 field_for_rows = indexOfColumn(pset.ctv_args[0], res);
140 if (field_for_rows < 0)
141 goto error_return;
142 }
143
144 /* Process second optional arg (horizontal header column) */
145 if (pset.ctv_args[1] == NULL)
146 field_for_columns = 1;
147 else
148 {
149 field_for_columns = indexOfColumn(pset.ctv_args[1], res);
150 if (field_for_columns < 0)
151 goto error_return;
152 }
153
154 /* Insist that header columns be distinct */
155 if (field_for_columns == field_for_rows)
156 {
157 pg_log_error("\\crosstabview: vertical and horizontal headers must be different columns");
158 goto error_return;
159 }
160
161 /* Process third optional arg (data column) */
162 if (pset.ctv_args[2] == NULL)
163 {
164 int i;
165
166 /*
167 * If the data column was not specified, we search for the one not
168 * used as either vertical or horizontal headers. Must be exactly
169 * three columns, or this won't be unique.
170 */
171 if (PQnfields(res) != 3)
172 {
173 pg_log_error("\\crosstabview: data column must be specified when query returns more than three columns");
174 goto error_return;
175 }
176
177 field_for_data = -1;
178 for (i = 0; i < PQnfields(res); i++)
179 {
180 if (i != field_for_rows && i != field_for_columns)
181 {
182 field_for_data = i;
183 break;
184 }
185 }
186 Assert(field_for_data >= 0);
187 }
188 else
189 {
190 field_for_data = indexOfColumn(pset.ctv_args[2], res);
191 if (field_for_data < 0)
192 goto error_return;
193 }
194
195 /* Process fourth optional arg (horizontal header sort column) */
196 if (pset.ctv_args[3] == NULL)
197 sort_field_for_columns = -1; /* no sort column */
198 else
199 {
200 sort_field_for_columns = indexOfColumn(pset.ctv_args[3], res);
201 if (sort_field_for_columns < 0)
202 goto error_return;
203 }
204
205 /*
206 * First part: accumulate the names that go into the vertical and
207 * horizontal headers, each into an AVL binary tree to build the set of
208 * DISTINCT values.
209 */
210
211 for (rn = 0; rn < PQntuples(res); rn++)
212 {
213 char *val;
214 char *val1;
215
216 /* horizontal */
217 val = PQgetisnull(res, rn, field_for_columns) ? NULL :
218 PQgetvalue(res, rn, field_for_columns);
219 val1 = NULL;
220
221 if (sort_field_for_columns >= 0 &&
222 !PQgetisnull(res, rn, sort_field_for_columns))
223 val1 = PQgetvalue(res, rn, sort_field_for_columns);
224
225 avlMergeValue(&piv_columns, val, val1);
226
227 if (piv_columns.count > CROSSTABVIEW_MAX_COLUMNS)
228 {
229 pg_log_error("\\crosstabview: maximum number of columns (%d) exceeded",
231 goto error_return;
232 }
233
234 /* vertical */
235 val = PQgetisnull(res, rn, field_for_rows) ? NULL :
236 PQgetvalue(res, rn, field_for_rows);
237
238 avlMergeValue(&piv_rows, val, NULL);
239 }
240
241 /*
242 * Second part: Generate sorted arrays from the AVL trees.
243 */
244
245 num_columns = piv_columns.count;
246 num_rows = piv_rows.count;
247
248 array_columns = (pivot_field *)
249 pg_malloc(sizeof(pivot_field) * num_columns);
250
251 array_rows = (pivot_field *)
252 pg_malloc(sizeof(pivot_field) * num_rows);
253
254 avlCollectFields(&piv_columns, piv_columns.root, array_columns, 0);
255 avlCollectFields(&piv_rows, piv_rows.root, array_rows, 0);
256
257 /*
258 * Third part: optionally, process the ranking data for the horizontal
259 * header
260 */
261 if (sort_field_for_columns >= 0)
262 rankSort(num_columns, array_columns);
263
264 /*
265 * Fourth part: print the crosstab'ed result.
266 */
267 retval = printCrosstab(res,
268 num_columns, array_columns, field_for_columns,
269 num_rows, array_rows, field_for_rows,
270 field_for_data);
271
272error_return:
273 avlFree(&piv_columns, piv_columns.root);
274 avlFree(&piv_rows, piv_rows.root);
275 pg_free(array_columns);
276 pg_free(array_rows);
277
278 return retval;
279}
static bool printCrosstab(const PGresult *result, int num_columns, pivot_field *piv_columns, int field_for_columns, int num_rows, pivot_field *piv_rows, int field_for_rows, int field_for_data)
Definition: crosstabview.c:286
static void rankSort(int num_columns, pivot_field *piv_columns)
Definition: crosstabview.c:588
static int indexOfColumn(char *arg, const PGresult *res)
Definition: crosstabview.c:636
static void avlInit(avl_tree *tree)
Definition: crosstabview.c:438
static void avlMergeValue(avl_tree *tree, char *name, char *sort_value)
Definition: crosstabview.c:560
#define CROSSTABVIEW_MAX_COLUMNS
Definition: crosstabview.h:24
long val
Definition: informix.c:689
#define PQresultStatus
Definition: libpq-be-fe.h:247
@ PGRES_TUPLES_OK
Definition: libpq-fe.h:128
Definition: crosstabview.c:74
int count
Definition: crosstabview.c:75
avl_node * root
Definition: crosstabview.c:76
char * ctv_args[4]
Definition: settings.h:133

References Assert(), avlCollectFields(), avlFree(), avlInit(), avlMergeValue(), _avl_tree::count, CROSSTABVIEW_MAX_COLUMNS, _psqlSettings::ctv_args, i, indexOfColumn(), pg_free(), pg_log_error, pg_malloc(), PGRES_TUPLES_OK, PQgetisnull, PQgetvalue, PQnfields, PQntuples, PQresultStatus, printCrosstab(), pset, rankSort(), _avl_tree::root, and val.

Referenced by PrintQueryResult().

◆ rankCompare()

static int rankCompare ( const void *  a,
const void *  b 
)
static

Definition at line 711 of file crosstabview.c.

712{
713 return pg_cmp_s32(*(const int *) a, *(const int *) b);
714}
static int pg_cmp_s32(int32 a, int32 b)
Definition: int.h:646

References a, b, and pg_cmp_s32().

Referenced by rankSort().

◆ rankSort()

static void rankSort ( int  num_columns,
pivot_field *  piv_columns 
)
static

Definition at line 588 of file crosstabview.c.

589{
590 int *hmap; /* [[offset in piv_columns, rank], ...for
591 * every header entry] */
592 int i;
593
594 hmap = (int *) pg_malloc(sizeof(int) * num_columns * 2);
595 for (i = 0; i < num_columns; i++)
596 {
597 char *val = piv_columns[i].sort_value;
598
599 /* ranking information is valid if non null and matches /^-?\d+$/ */
600 if (val &&
601 ((*val == '-' &&
602 strspn(val + 1, "0123456789") == strlen(val + 1)) ||
603 strspn(val, "0123456789") == strlen(val)))
604 {
605 hmap[i * 2] = atoi(val);
606 hmap[i * 2 + 1] = i;
607 }
608 else
609 {
610 /* invalid rank information ignored (equivalent to rank 0) */
611 hmap[i * 2] = 0;
612 hmap[i * 2 + 1] = i;
613 }
614 }
615
616 qsort(hmap, num_columns, sizeof(int) * 2, rankCompare);
617
618 for (i = 0; i < num_columns; i++)
619 {
620 piv_columns[hmap[i * 2 + 1]].rank = i;
621 }
622
623 pg_free(hmap);
624}
static int rankCompare(const void *a, const void *b)
Definition: crosstabview.c:711
#define qsort(a, b, c, d)
Definition: port.h:479

References i, pg_free(), pg_malloc(), qsort, _pivot_field::rank, rankCompare(), _pivot_field::sort_value, and val.

Referenced by PrintResultInCrosstab().

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