granicus.if.org Git - postgresql/blob - src/test/regress/regress.c

   1 /*
   2  * $Header: /cvsroot/pgsql/src/test/regress/regress.c,v 1.48 2001/08/16 20:38:56 tgl Exp $
   3  */
   4
   5 #include "postgres.h"
   6
   7 #include <float.h>                              /* faked on sunos */
   8
   9 #include "utils/geo_decls.h"    /* includes <math.h> */
  10 #include "executor/executor.h"  /* For GetAttributeByName */
  11 #include "commands/sequence.h"  /* for nextval() */
  12
  13 #define P_MAXDIG 12
  14 #define LDELIM                  '('
  15 #define RDELIM                  ')'
  16 #define DELIM                   ','
  17
  18 typedef TupleTableSlot *TUPLE;
  19
  20 extern Datum regress_dist_ptpath(PG_FUNCTION_ARGS);
  21 extern Datum regress_path_dist(PG_FUNCTION_ARGS);
  22 extern PATH *poly2path(POLYGON *poly);
  23 extern Datum interpt_pp(PG_FUNCTION_ARGS);
  24 extern void regress_lseg_construct(LSEG *lseg, Point *pt1, Point *pt2);
  25 extern Datum overpaid(PG_FUNCTION_ARGS);
  26 extern Datum boxarea(PG_FUNCTION_ARGS);
  27 extern char *reverse_name(char *string);
  28 extern int      oldstyle_length(int n, text *t);
  29
  30 /*
  31 ** Distance from a point to a path
  32 */
  33 PG_FUNCTION_INFO_V1(regress_dist_ptpath);
  34
  35 Datum
  36 regress_dist_ptpath(PG_FUNCTION_ARGS)
  37 {
  38         Point      *pt = PG_GETARG_POINT_P(0);
  39         PATH       *path = PG_GETARG_PATH_P(1);
  40         float8          result = 0.0;   /* keep compiler quiet */
  41         float8          tmp;
  42         int                     i;
  43         LSEG            lseg;
  44
  45         switch (path->npts)
  46         {
  47                 case 0:
  48                         PG_RETURN_NULL();
  49                 case 1:
  50                         result = point_dt(pt, &path->p[0]);
  51                         break;
  52                 default:
  53
  54                         /*
  55                          * the distance from a point to a path is the smallest
  56                          * distance from the point to any of its constituent segments.
  57                          */
  58                         Assert(path->npts > 1);
  59                         for (i = 0; i < path->npts - 1; ++i)
  60                         {
  61                                 regress_lseg_construct(&lseg, &path->p[i], &path->p[i + 1]);
  62                                 tmp = DatumGetFloat8(DirectFunctionCall2(dist_ps,
  63                                                                                                           PointPGetDatum(pt),
  64                                                                                                   LsegPGetDatum(&lseg)));
  65                                 if (i == 0 || tmp < result)
  66                                         result = tmp;
  67                         }
  68                         break;
  69         }
  70         PG_RETURN_FLOAT8(result);
  71 }
  72
  73 /* this essentially does a cartesian product of the lsegs in the
  74    two paths, and finds the min distance between any two lsegs */
  75 PG_FUNCTION_INFO_V1(regress_path_dist);
  76
  77 Datum
  78 regress_path_dist(PG_FUNCTION_ARGS)
  79 {
  80         PATH       *p1 = PG_GETARG_PATH_P(0);
  81         PATH       *p2 = PG_GETARG_PATH_P(1);
  82         bool            have_min = false;
  83         float8          min = 0.0;              /* initialize to keep compiler quiet */
  84         float8          tmp;
  85         int                     i,
  86                                 j;
  87         LSEG            seg1,
  88                                 seg2;
  89
  90         for (i = 0; i < p1->npts - 1; i++)
  91         {
  92                 for (j = 0; j < p2->npts - 1; j++)
  93                 {
  94                         regress_lseg_construct(&seg1, &p1->p[i], &p1->p[i + 1]);
  95                         regress_lseg_construct(&seg2, &p2->p[j], &p2->p[j + 1]);
  96
  97                         tmp = DatumGetFloat8(DirectFunctionCall2(lseg_distance,
  98                                                                                                          LsegPGetDatum(&seg1),
  99                                                                                                   LsegPGetDatum(&seg2)));
 100                         if (!have_min || tmp < min)
 101                         {
 102                                 min = tmp;
 103                                 have_min = true;
 104                         }
 105                 }
 106         }
 107
 108         if (!have_min)
 109                 PG_RETURN_NULL();
 110
 111         PG_RETURN_FLOAT8(min);
 112 }
 113
 114 PATH *
 115 poly2path(poly)
 116 POLYGON    *poly;
 117 {
 118         int                     i;
 119         char       *output = (char *) palloc(2 * (P_MAXDIG + 1) * poly->npts + 64);
 120         char            buf[2 * (P_MAXDIG) + 20];
 121
 122         sprintf(output, "(1, %*d", P_MAXDIG, poly->npts);
 123
 124         for (i = 0; i < poly->npts; i++)
 125         {
 126                 sprintf(buf, ",%*g,%*g", P_MAXDIG, poly->p[i].x, P_MAXDIG, poly->p[i].y);
 127                 strcat(output, buf);
 128         }
 129
 130         sprintf(buf, "%c", RDELIM);
 131         strcat(output, buf);
 132         return DatumGetPathP(DirectFunctionCall1(path_in,
 133                                                                                          CStringGetDatum(output)));
 134 }
 135
 136 /* return the point where two paths intersect, or NULL if no intersection. */
 137 PG_FUNCTION_INFO_V1(interpt_pp);
 138
 139 Datum
 140 interpt_pp(PG_FUNCTION_ARGS)
 141 {
 142         PATH       *p1 = PG_GETARG_PATH_P(0);
 143         PATH       *p2 = PG_GETARG_PATH_P(1);
 144         int                     i,
 145                                 j;
 146         LSEG            seg1,
 147                                 seg2;
 148         bool            found;                  /* We've found the intersection */
 149
 150         found = false;                          /* Haven't found it yet */
 151
 152         for (i = 0; i < p1->npts - 1 && !found; i++)
 153         {
 154                 regress_lseg_construct(&seg1, &p1->p[i], &p1->p[i + 1]);
 155                 for (j = 0; j < p2->npts - 1 && !found; j++)
 156                 {
 157                         regress_lseg_construct(&seg2, &p2->p[j], &p2->p[j + 1]);
 158                         if (DatumGetBool(DirectFunctionCall2(lseg_intersect,
 159                                                                                                  LsegPGetDatum(&seg1),
 160                                                                                                  LsegPGetDatum(&seg2))))
 161                                 found = true;
 162                 }
 163         }
 164
 165         if (!found)
 166                 PG_RETURN_NULL();
 167
 168         /*
 169          * Note: DirectFunctionCall2 will kick out an error if lseg_interpt()
 170          * returns NULL, but that should be impossible since we know the two
 171          * segments intersect.
 172          */
 173         PG_RETURN_DATUM(DirectFunctionCall2(lseg_interpt,
 174                                                                                 LsegPGetDatum(&seg1),
 175                                                                                 LsegPGetDatum(&seg2)));
 176 }
 177
 178
 179 /* like lseg_construct, but assume space already allocated */
 180 void
 181 regress_lseg_construct(lseg, pt1, pt2)
 182 LSEG       *lseg;
 183 Point      *pt1;
 184 Point      *pt2;
 185 {
 186         lseg->p[0].x = pt1->x;
 187         lseg->p[0].y = pt1->y;
 188         lseg->p[1].x = pt2->x;
 189         lseg->p[1].y = pt2->y;
 190         lseg->m = point_sl(pt1, pt2);
 191 }
 192
 193 PG_FUNCTION_INFO_V1(overpaid);
 194
 195 Datum
 196 overpaid(PG_FUNCTION_ARGS)
 197 {
 198         TUPLE           tuple = (TUPLE) PG_GETARG_POINTER(0);
 199         bool            isnull;
 200         int32           salary;
 201
 202         salary = DatumGetInt32(GetAttributeByName(tuple, "salary", &isnull));
 203         if (isnull)
 204                 PG_RETURN_NULL();
 205         PG_RETURN_BOOL(salary > 699);
 206 }
 207
 208 /* New type "widget"
 209  * This used to be "circle", but I added circle to builtins,
 210  *      so needed to make sure the names do not collide. - tgl 97/04/21
 211  */
 212
 213 typedef struct
 214 {
 215         Point           center;
 216         double          radius;
 217 }                       WIDGET;
 218
 219 WIDGET     *widget_in(char *str);
 220 char       *widget_out(WIDGET * widget);
 221 extern Datum pt_in_widget(PG_FUNCTION_ARGS);
 222
 223 #define NARGS   3
 224
 225 WIDGET *
 226 widget_in(str)
 227 char       *str;
 228 {
 229         char       *p,
 230                            *coord[NARGS],
 231                                 buf2[1000];
 232         int                     i;
 233         WIDGET     *result;
 234
 235         if (str == NULL)
 236                 return NULL;
 237         for (i = 0, p = str; *p && i < NARGS && *p != RDELIM; p++)
 238                 if (*p == ',' || (*p == LDELIM && !i))
 239                         coord[i++] = p + 1;
 240         if (i < NARGS - 1)
 241                 return NULL;
 242         result = (WIDGET *) palloc(sizeof(WIDGET));
 243         result->center.x = atof(coord[0]);
 244         result->center.y = atof(coord[1]);
 245         result->radius = atof(coord[2]);
 246
 247         sprintf(buf2, "widget_in: read (%f, %f, %f)\n", result->center.x,
 248                         result->center.y, result->radius);
 249         return result;
 250 }
 251
 252 char *
 253 widget_out(widget)
 254 WIDGET     *widget;
 255 {
 256         char       *result;
 257
 258         if (widget == NULL)
 259                 return NULL;
 260
 261         result = (char *) palloc(60);
 262         sprintf(result, "(%g,%g,%g)",
 263                         widget->center.x, widget->center.y, widget->radius);
 264         return result;
 265 }
 266
 267 PG_FUNCTION_INFO_V1(pt_in_widget);
 268
 269 Datum
 270 pt_in_widget(PG_FUNCTION_ARGS)
 271 {
 272         Point      *point = PG_GETARG_POINT_P(0);
 273         WIDGET     *widget = (WIDGET *) PG_GETARG_POINTER(1);
 274
 275         PG_RETURN_BOOL(point_dt(point, &widget->center) < widget->radius);
 276 }
 277
 278 #define ABS(X) ((X) >= 0 ? (X) : -(X))
 279
 280 PG_FUNCTION_INFO_V1(boxarea);
 281
 282 Datum
 283 boxarea(PG_FUNCTION_ARGS)
 284 {
 285         BOX                *box = PG_GETARG_BOX_P(0);
 286         double          width,
 287                                 height;
 288
 289         width = ABS(box->high.x - box->low.x);
 290         height = ABS(box->high.y - box->low.y);
 291         PG_RETURN_FLOAT8(width * height);
 292 }
 293
 294 char *
 295 reverse_name(char *string)
 296 {
 297         int                     i;
 298         int                     len;
 299         char       *new_string;
 300
 301         if (!(new_string = palloc(NAMEDATALEN)))
 302         {
 303                 fprintf(stderr, "reverse_name: palloc failed\n");
 304                 return NULL;
 305         }
 306         MemSet(new_string, 0, NAMEDATALEN);
 307         for (i = 0; i < NAMEDATALEN && string[i]; ++i)
 308                 ;
 309         if (i == NAMEDATALEN || !string[i])
 310                 --i;
 311         len = i;
 312         for (; i >= 0; --i)
 313                 new_string[len - i] = string[i];
 314         return new_string;
 315 }
 316
 317 /* This rather silly function is just to test that oldstyle functions
 318  * work correctly on toast-able inputs.
 319  */
 320 int
 321 oldstyle_length(int n, text *t)
 322 {
 323         int                     len = 0;
 324
 325         if (t)
 326                 len = VARSIZE(t) - VARHDRSZ;
 327
 328         return n + len;
 329 }
 330
 331 #include "executor/spi.h"               /* this is what you need to work with SPI */
 332 #include "commands/trigger.h"   /* -"- and triggers */
 333
 334 static TransactionId fd17b_xid = InvalidTransactionId;
 335 static TransactionId fd17a_xid = InvalidTransactionId;
 336 static int      fd17b_level = 0;
 337 static int      fd17a_level = 0;
 338 static bool fd17b_recursion = true;
 339 static bool fd17a_recursion = true;
 340 extern Datum funny_dup17(PG_FUNCTION_ARGS);
 341
 342 PG_FUNCTION_INFO_V1(funny_dup17);
 343
 344 Datum
 345 funny_dup17(PG_FUNCTION_ARGS)
 346 {
 347         TriggerData *trigdata = (TriggerData *) fcinfo->context;
 348         TransactionId *xid;
 349         int                *level;
 350         bool       *recursion;
 351         Relation        rel;
 352         TupleDesc       tupdesc;
 353         HeapTuple       tuple;
 354         char       *query,
 355                            *fieldval,
 356                            *fieldtype;
 357         char       *when;
 358         int                     inserted;
 359         int                     selected = 0;
 360         int                     ret;
 361
 362         if (!CALLED_AS_TRIGGER(fcinfo))
 363                 elog(ERROR, "funny_dup17: not fired by trigger manager");
 364
 365         tuple = trigdata->tg_trigtuple;
 366         rel = trigdata->tg_relation;
 367         tupdesc = rel->rd_att;
 368         if (TRIGGER_FIRED_BEFORE(trigdata->tg_event))
 369         {
 370                 xid = &fd17b_xid;
 371                 level = &fd17b_level;
 372                 recursion = &fd17b_recursion;
 373                 when = "BEFORE";
 374         }
 375         else
 376         {
 377                 xid = &fd17a_xid;
 378                 level = &fd17a_level;
 379                 recursion = &fd17a_recursion;
 380                 when = "AFTER ";
 381         }
 382
 383         if (!TransactionIdIsCurrentTransactionId(*xid))
 384         {
 385                 *xid = GetCurrentTransactionId();
 386                 *level = 0;
 387                 *recursion = true;
 388         }
 389
 390         if (*level == 17)
 391         {
 392                 *recursion = false;
 393                 return PointerGetDatum(tuple);
 394         }
 395
 396         if (!(*recursion))
 397                 return PointerGetDatum(tuple);
 398
 399         (*level)++;
 400
 401         SPI_connect();
 402
 403         fieldval = SPI_getvalue(tuple, tupdesc, 1);
 404         fieldtype = SPI_gettype(tupdesc, 1);
 405
 406         query = (char *) palloc(100 + NAMEDATALEN * 3 +
 407                                                         strlen(fieldval) + strlen(fieldtype));
 408
 409         sprintf(query, "insert into %s select * from %s where %s = '%s'::%s",
 410                         SPI_getrelname(rel), SPI_getrelname(rel),
 411                         SPI_fname(tupdesc, 1),
 412                         fieldval, fieldtype);
 413
 414         if ((ret = SPI_exec(query, 0)) < 0)
 415                 elog(ERROR, "funny_dup17 (fired %s) on level %3d: SPI_exec (insert ...) returned %d",
 416                          when, *level, ret);
 417
 418         inserted = SPI_processed;
 419
 420         sprintf(query, "select count (*) from %s where %s = '%s'::%s",
 421                         SPI_getrelname(rel),
 422                         SPI_fname(tupdesc, 1),
 423                         fieldval, fieldtype);
 424
 425         if ((ret = SPI_exec(query, 0)) < 0)
 426                 elog(ERROR, "funny_dup17 (fired %s) on level %3d: SPI_exec (select ...) returned %d",
 427                          when, *level, ret);
 428
 429         if (SPI_processed > 0)
 430         {
 431                 selected = DatumGetInt32(DirectFunctionCall1(int4in,
 432                                                                                         CStringGetDatum(SPI_getvalue(
 433                                                                                                    SPI_tuptable->vals[0],
 434                                                                                                    SPI_tuptable->tupdesc,
 435                                                                                                                                                  1
 436                                                                                                                                         ))));
 437         }
 438
 439         elog(NOTICE, "funny_dup17 (fired %s) on level %3d: %d/%d tuples inserted/selected",
 440                  when, *level, inserted, selected);
 441
 442         SPI_finish();
 443
 444         (*level)--;
 445
 446         if (*level == 0)
 447                 *xid = InvalidTransactionId;
 448
 449         return PointerGetDatum(tuple);
 450 }
 451
 452 extern Datum ttdummy(PG_FUNCTION_ARGS);
 453 extern Datum set_ttdummy(PG_FUNCTION_ARGS);
 454
 455 #define TTDUMMY_INFINITY        999999
 456
 457 static void *splan = NULL;
 458 static bool ttoff = false;
 459
 460 PG_FUNCTION_INFO_V1(ttdummy);
 461
 462 Datum
 463 ttdummy(PG_FUNCTION_ARGS)
 464 {
 465         TriggerData *trigdata = (TriggerData *) fcinfo->context;
 466         Trigger    *trigger;            /* to get trigger name */
 467         char      **args;                       /* arguments */
 468         int                     attnum[2];              /* fnumbers of start/stop columns */
 469         Datum           oldon,
 470                                 oldoff;
 471         Datum           newon,
 472                                 newoff;
 473         Datum      *cvals;                      /* column values */
 474         char       *cnulls;                     /* column nulls */
 475         char       *relname;            /* triggered relation name */
 476         Relation        rel;                    /* triggered relation */
 477         HeapTuple       trigtuple;
 478         HeapTuple       newtuple = NULL;
 479         HeapTuple       rettuple;
 480         TupleDesc       tupdesc;                /* tuple description */
 481         int                     natts;                  /* # of attributes */
 482         bool            isnull;                 /* to know is some column NULL or not */
 483         int                     ret;
 484         int                     i;
 485
 486         if (!CALLED_AS_TRIGGER(fcinfo))
 487                 elog(ERROR, "ttdummy: not fired by trigger manager");
 488         if (TRIGGER_FIRED_FOR_STATEMENT(trigdata->tg_event))
 489                 elog(ERROR, "ttdummy: can't process STATEMENT events");
 490         if (TRIGGER_FIRED_AFTER(trigdata->tg_event))
 491                 elog(ERROR, "ttdummy: must be fired before event");
 492         if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
 493                 elog(ERROR, "ttdummy: can't process INSERT event");
 494         if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
 495                 newtuple = trigdata->tg_newtuple;
 496
 497         trigtuple = trigdata->tg_trigtuple;
 498
 499         rel = trigdata->tg_relation;
 500         relname = SPI_getrelname(rel);
 501
 502         /* check if TT is OFF for this relation */
 503         if (ttoff)                                      /* OFF - nothing to do */
 504         {
 505                 pfree(relname);
 506                 return PointerGetDatum((newtuple != NULL) ? newtuple : trigtuple);
 507         }
 508
 509         trigger = trigdata->tg_trigger;
 510
 511         if (trigger->tgnargs != 2)
 512                 elog(ERROR, "ttdummy (%s): invalid (!= 2) number of arguments %d",
 513                          relname, trigger->tgnargs);
 514
 515         args = trigger->tgargs;
 516         tupdesc = rel->rd_att;
 517         natts = tupdesc->natts;
 518
 519         for (i = 0; i < 2; i++)
 520         {
 521                 attnum[i] = SPI_fnumber(tupdesc, args[i]);
 522                 if (attnum[i] < 0)
 523                         elog(ERROR, "ttdummy (%s): there is no attribute %s", relname, args[i]);
 524                 if (SPI_gettypeid(tupdesc, attnum[i]) != INT4OID)
 525                         elog(ERROR, "ttdummy (%s): attributes %s and %s must be of abstime type",
 526                                  relname, args[0], args[1]);
 527         }
 528
 529         oldon = SPI_getbinval(trigtuple, tupdesc, attnum[0], &isnull);
 530         if (isnull)
 531                 elog(ERROR, "ttdummy (%s): %s must be NOT NULL", relname, args[0]);
 532
 533         oldoff = SPI_getbinval(trigtuple, tupdesc, attnum[1], &isnull);
 534         if (isnull)
 535                 elog(ERROR, "ttdummy (%s): %s must be NOT NULL", relname, args[1]);
 536
 537         if (newtuple != NULL)           /* UPDATE */
 538         {
 539                 newon = SPI_getbinval(newtuple, tupdesc, attnum[0], &isnull);
 540                 if (isnull)
 541                         elog(ERROR, "ttdummy (%s): %s must be NOT NULL", relname, args[0]);
 542                 newoff = SPI_getbinval(newtuple, tupdesc, attnum[1], &isnull);
 543                 if (isnull)
 544                         elog(ERROR, "ttdummy (%s): %s must be NOT NULL", relname, args[1]);
 545
 546                 if (oldon != newon || oldoff != newoff)
 547                         elog(ERROR, "ttdummy (%s): you can't change %s and/or %s columns (use set_ttdummy)",
 548                                  relname, args[0], args[1]);
 549
 550                 if (newoff != TTDUMMY_INFINITY)
 551                 {
 552                         pfree(relname);         /* allocated in upper executor context */
 553                         return PointerGetDatum(NULL);
 554                 }
 555         }
 556         else if (oldoff != TTDUMMY_INFINITY)            /* DELETE */
 557         {
 558                 pfree(relname);
 559                 return PointerGetDatum(NULL);
 560         }
 561
 562         {
 563                 text       *seqname = DatumGetTextP(DirectFunctionCall1(textin,
 564                                                                                 CStringGetDatum("ttdummy_seq")));
 565
 566                 newoff = DirectFunctionCall1(nextval,
 567                                                                          PointerGetDatum(seqname));
 568                 /* nextval now returns int64; coerce down to int32 */
 569                 newoff = Int32GetDatum((int32) DatumGetInt64(newoff));
 570                 pfree(seqname);
 571         }
 572
 573         /* Connect to SPI manager */
 574         if ((ret = SPI_connect()) < 0)
 575                 elog(ERROR, "ttdummy (%s): SPI_connect returned %d", relname, ret);
 576
 577         /* Fetch tuple values and nulls */
 578         cvals = (Datum *) palloc(natts * sizeof(Datum));
 579         cnulls = (char *) palloc(natts * sizeof(char));
 580         for (i = 0; i < natts; i++)
 581         {
 582                 cvals[i] = SPI_getbinval((newtuple != NULL) ? newtuple : trigtuple,
 583                                                                  tupdesc, i + 1, &isnull);
 584                 cnulls[i] = (isnull) ? 'n' : ' ';
 585         }
 586
 587         /* change date column(s) */
 588         if (newtuple)                           /* UPDATE */
 589         {
 590                 cvals[attnum[0] - 1] = newoff;  /* start_date eq current date */
 591                 cnulls[attnum[0] - 1] = ' ';
 592                 cvals[attnum[1] - 1] = TTDUMMY_INFINITY;                /* stop_date eq INFINITY */
 593                 cnulls[attnum[1] - 1] = ' ';
 594         }
 595         else
 596 /* DELETE */
 597         {
 598                 cvals[attnum[1] - 1] = newoff;  /* stop_date eq current date */
 599                 cnulls[attnum[1] - 1] = ' ';
 600         }
 601
 602         /* if there is no plan ... */
 603         if (splan == NULL)
 604         {
 605                 void       *pplan;
 606                 Oid                *ctypes;
 607                 char       *query;
 608
 609                 /* allocate space in preparation */
 610                 ctypes = (Oid *) palloc(natts * sizeof(Oid));
 611                 query = (char *) palloc(100 + 16 * natts);
 612
 613                 /*
 614                  * Construct query: INSERT INTO _relation_ VALUES ($1, ...)
 615                  */
 616                 sprintf(query, "INSERT INTO %s VALUES (", relname);
 617                 for (i = 1; i <= natts; i++)
 618                 {
 619                         sprintf(query + strlen(query), "$%d%s",
 620                                         i, (i < natts) ? ", " : ")");
 621                         ctypes[i - 1] = SPI_gettypeid(tupdesc, i);
 622                 }
 623
 624                 /* Prepare plan for query */
 625                 pplan = SPI_prepare(query, natts, ctypes);
 626                 if (pplan == NULL)
 627                         elog(ERROR, "ttdummy (%s): SPI_prepare returned %d", relname, SPI_result);
 628
 629                 pplan = SPI_saveplan(pplan);
 630                 if (pplan == NULL)
 631                         elog(ERROR, "ttdummy (%s): SPI_saveplan returned %d", relname, SPI_result);
 632
 633                 splan = pplan;
 634         }
 635
 636         ret = SPI_execp(splan, cvals, cnulls, 0);
 637
 638         if (ret < 0)
 639                 elog(ERROR, "ttdummy (%s): SPI_execp returned %d", relname, ret);
 640
 641         /* Tuple to return to upper Executor ... */
 642         if (newtuple)                           /* UPDATE */
 643         {
 644                 HeapTuple       tmptuple;
 645
 646                 tmptuple = SPI_copytuple(trigtuple);
 647                 rettuple = SPI_modifytuple(rel, tmptuple, 1, &(attnum[1]), &newoff, NULL);
 648                 SPI_freetuple(tmptuple);
 649         }
 650         else
 651 /* DELETE */
 652                 rettuple = trigtuple;
 653
 654         SPI_finish();                           /* don't forget say Bye to SPI mgr */
 655
 656         pfree(relname);
 657
 658         return PointerGetDatum(rettuple);
 659 }
 660
 661 PG_FUNCTION_INFO_V1(set_ttdummy);
 662
 663 Datum
 664 set_ttdummy(PG_FUNCTION_ARGS)
 665 {
 666         int32           on = PG_GETARG_INT32(0);
 667
 668         if (ttoff)                                      /* OFF currently */
 669         {
 670                 if (on == 0)
 671                         PG_RETURN_INT32(0);
 672
 673                 /* turn ON */
 674                 ttoff = false;
 675                 PG_RETURN_INT32(0);
 676         }
 677
 678         /* ON currently */
 679         if (on != 0)
 680                 PG_RETURN_INT32(1);
 681
 682         /* turn OFF */
 683         ttoff = true;
 684
 685         PG_RETURN_INT32(1);
 686 }