granicus.if.org Git - postgresql/blob - src/backend/utils/adt/rowtypes.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * rowtypes.c
   4  *        I/O functions for generic composite types.
   5  *
   6  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  *
  10  * IDENTIFICATION
  11  *        $PostgreSQL: pgsql/src/backend/utils/adt/rowtypes.c,v 1.11 2005/05/01 18:56:18 tgl Exp $
  12  *
  13  *-------------------------------------------------------------------------
  14  */
  15 #include "postgres.h"
  16
  17 #include <ctype.h>
  18
  19 #include "access/heapam.h"
  20 #include "access/htup.h"
  21 #include "catalog/pg_type.h"
  22 #include "lib/stringinfo.h"
  23 #include "libpq/pqformat.h"
  24 #include "utils/builtins.h"
  25 #include "utils/lsyscache.h"
  26 #include "utils/typcache.h"
  27
  28
  29 /*
  30  * structure to cache metadata needed for record I/O
  31  */
  32 typedef struct ColumnIOData
  33 {
  34         Oid                     column_type;
  35         Oid                     typiofunc;
  36         Oid                     typioparam;
  37         FmgrInfo        proc;
  38 } ColumnIOData;
  39
  40 typedef struct RecordIOData
  41 {
  42         Oid                     record_type;
  43         int32           record_typmod;
  44         int                     ncolumns;
  45         ColumnIOData columns[1];        /* VARIABLE LENGTH ARRAY */
  46 } RecordIOData;
  47
  48
  49 /*
  50  * record_in            - input routine for any composite type.
  51  */
  52 Datum
  53 record_in(PG_FUNCTION_ARGS)
  54 {
  55         char       *string = PG_GETARG_CSTRING(0);
  56         Oid                     tupType = PG_GETARG_OID(1);
  57         HeapTupleHeader result;
  58         int32           tupTypmod;
  59         TupleDesc       tupdesc;
  60         HeapTuple       tuple;
  61         RecordIOData *my_extra;
  62         bool            needComma = false;
  63         int                     ncolumns;
  64         int                     i;
  65         char       *ptr;
  66         Datum      *values;
  67         char       *nulls;
  68         StringInfoData buf;
  69
  70         /*
  71          * Use the passed type unless it's RECORD; we can't support input of
  72          * anonymous types, mainly because there's no good way to figure out
  73          * which anonymous type is wanted.      Note that for RECORD, what we'll
  74          * probably actually get is RECORD's typelem, ie, zero.
  75          */
  76         if (tupType == InvalidOid || tupType == RECORDOID)
  77                 ereport(ERROR,
  78                                 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
  79                 errmsg("input of anonymous composite types is not implemented")));
  80         tupTypmod = -1;                         /* for all non-anonymous types */
  81         tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
  82         ncolumns = tupdesc->natts;
  83
  84         /*
  85          * We arrange to look up the needed I/O info just once per series of
  86          * calls, assuming the record type doesn't change underneath us.
  87          */
  88         my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
  89         if (my_extra == NULL ||
  90                 my_extra->ncolumns != ncolumns)
  91         {
  92                 fcinfo->flinfo->fn_extra =
  93                         MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
  94                                                            sizeof(RecordIOData) - sizeof(ColumnIOData)
  95                                                            + ncolumns * sizeof(ColumnIOData));
  96                 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
  97                 my_extra->record_type = InvalidOid;
  98                 my_extra->record_typmod = 0;
  99         }
 100
 101         if (my_extra->record_type != tupType ||
 102                 my_extra->record_typmod != tupTypmod)
 103         {
 104                 MemSet(my_extra, 0,
 105                            sizeof(RecordIOData) - sizeof(ColumnIOData)
 106                            + ncolumns * sizeof(ColumnIOData));
 107                 my_extra->record_type = tupType;
 108                 my_extra->record_typmod = tupTypmod;
 109                 my_extra->ncolumns = ncolumns;
 110         }
 111
 112         values = (Datum *) palloc(ncolumns * sizeof(Datum));
 113         nulls = (char *) palloc(ncolumns * sizeof(char));
 114
 115         /*
 116          * Scan the string.  We use "buf" to accumulate the de-quoted data for
 117          * each column, which is then fed to the appropriate input converter.
 118          */
 119         ptr = string;
 120         /* Allow leading whitespace */
 121         while (*ptr && isspace((unsigned char) *ptr))
 122                 ptr++;
 123         if (*ptr++ != '(')
 124                 ereport(ERROR,
 125                                 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
 126                                  errmsg("malformed record literal: \"%s\"", string),
 127                                  errdetail("Missing left parenthesis.")));
 128
 129         initStringInfo(&buf);
 130
 131         for (i = 0; i < ncolumns; i++)
 132         {
 133                 ColumnIOData *column_info = &my_extra->columns[i];
 134                 Oid                     column_type = tupdesc->attrs[i]->atttypid;
 135
 136                 /* Ignore dropped columns in datatype, but fill with nulls */
 137                 if (tupdesc->attrs[i]->attisdropped)
 138                 {
 139                         values[i] = (Datum) 0;
 140                         nulls[i] = 'n';
 141                         continue;
 142                 }
 143
 144                 if (needComma)
 145                 {
 146                         /* Skip comma that separates prior field from this one */
 147                         if (*ptr == ',')
 148                                 ptr++;
 149                         else
 150                                 /* *ptr must be ')' */
 151                                 ereport(ERROR,
 152                                                 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
 153                                           errmsg("malformed record literal: \"%s\"", string),
 154                                                  errdetail("Too few columns.")));
 155                 }
 156
 157                 /* Check for null: completely empty input means null */
 158                 if (*ptr == ',' || *ptr == ')')
 159                 {
 160                         values[i] = (Datum) 0;
 161                         nulls[i] = 'n';
 162                 }
 163                 else
 164                 {
 165                         /* Extract string for this column */
 166                         bool            inquote = false;
 167
 168                         buf.len = 0;
 169                         buf.data[0] = '\0';
 170                         while (inquote || !(*ptr == ',' || *ptr == ')'))
 171                         {
 172                                 char            ch = *ptr++;
 173
 174                                 if (ch == '\0')
 175                                         ereport(ERROR,
 176                                                         (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
 177                                                          errmsg("malformed record literal: \"%s\"",
 178                                                                         string),
 179                                                          errdetail("Unexpected end of input.")));
 180                                 if (ch == '\\')
 181                                 {
 182                                         if (*ptr == '\0')
 183                                                 ereport(ERROR,
 184                                                    (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
 185                                                         errmsg("malformed record literal: \"%s\"",
 186                                                                    string),
 187                                                         errdetail("Unexpected end of input.")));
 188                                         appendStringInfoChar(&buf, *ptr++);
 189                                 }
 190                                 else if (ch == '\"')
 191                                 {
 192                                         if (!inquote)
 193                                                 inquote = true;
 194                                         else if (*ptr == '\"')
 195                                         {
 196                                                 /* doubled quote within quote sequence */
 197                                                 appendStringInfoChar(&buf, *ptr++);
 198                                         }
 199                                         else
 200                                                 inquote = false;
 201                                 }
 202                                 else
 203                                         appendStringInfoChar(&buf, ch);
 204                         }
 205
 206                         /*
 207                          * Convert the column value
 208                          */
 209                         if (column_info->column_type != column_type)
 210                         {
 211                                 getTypeInputInfo(column_type,
 212                                                                  &column_info->typiofunc,
 213                                                                  &column_info->typioparam);
 214                                 fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
 215                                                           fcinfo->flinfo->fn_mcxt);
 216                                 column_info->column_type = column_type;
 217                         }
 218
 219                         values[i] = FunctionCall3(&column_info->proc,
 220                                                                           CStringGetDatum(buf.data),
 221                                                            ObjectIdGetDatum(column_info->typioparam),
 222                                                         Int32GetDatum(tupdesc->attrs[i]->atttypmod));
 223                         nulls[i] = ' ';
 224                 }
 225
 226                 /*
 227                  * Prep for next column
 228                  */
 229                 needComma = true;
 230         }
 231
 232         if (*ptr++ != ')')
 233                 ereport(ERROR,
 234                                 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
 235                                  errmsg("malformed record literal: \"%s\"", string),
 236                                  errdetail("Too many columns.")));
 237         /* Allow trailing whitespace */
 238         while (*ptr && isspace((unsigned char) *ptr))
 239                 ptr++;
 240         if (*ptr)
 241                 ereport(ERROR,
 242                                 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
 243                                  errmsg("malformed record literal: \"%s\"", string),
 244                                  errdetail("Junk after right parenthesis.")));
 245
 246         tuple = heap_formtuple(tupdesc, values, nulls);
 247
 248         /*
 249          * We cannot return tuple->t_data because heap_formtuple allocates it
 250          * as part of a larger chunk, and our caller may expect to be able to
 251          * pfree our result.  So must copy the info into a new palloc chunk.
 252          */
 253         result = (HeapTupleHeader) palloc(tuple->t_len);
 254         memcpy(result, tuple->t_data, tuple->t_len);
 255
 256         heap_freetuple(tuple);
 257         pfree(buf.data);
 258         pfree(values);
 259         pfree(nulls);
 260
 261         PG_RETURN_HEAPTUPLEHEADER(result);
 262 }
 263
 264 /*
 265  * record_out           - output routine for any composite type.
 266  */
 267 Datum
 268 record_out(PG_FUNCTION_ARGS)
 269 {
 270         HeapTupleHeader rec = PG_GETARG_HEAPTUPLEHEADER(0);
 271         Oid                     tupType;
 272         int32           tupTypmod;
 273         TupleDesc       tupdesc;
 274         HeapTupleData tuple;
 275         RecordIOData *my_extra;
 276         bool            needComma = false;
 277         int                     ncolumns;
 278         int                     i;
 279         Datum      *values;
 280         char       *nulls;
 281         StringInfoData buf;
 282
 283         /* Extract type info from the tuple itself */
 284         tupType = HeapTupleHeaderGetTypeId(rec);
 285         tupTypmod = HeapTupleHeaderGetTypMod(rec);
 286         tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
 287         ncolumns = tupdesc->natts;
 288
 289         /* Build a temporary HeapTuple control structure */
 290         tuple.t_len = HeapTupleHeaderGetDatumLength(rec);
 291         ItemPointerSetInvalid(&(tuple.t_self));
 292         tuple.t_tableOid = InvalidOid;
 293         tuple.t_data = rec;
 294
 295         /*
 296          * We arrange to look up the needed I/O info just once per series of
 297          * calls, assuming the record type doesn't change underneath us.
 298          */
 299         my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
 300         if (my_extra == NULL ||
 301                 my_extra->ncolumns != ncolumns)
 302         {
 303                 fcinfo->flinfo->fn_extra =
 304                         MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
 305                                                            sizeof(RecordIOData) - sizeof(ColumnIOData)
 306                                                            + ncolumns * sizeof(ColumnIOData));
 307                 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
 308                 my_extra->record_type = InvalidOid;
 309                 my_extra->record_typmod = 0;
 310         }
 311
 312         if (my_extra->record_type != tupType ||
 313                 my_extra->record_typmod != tupTypmod)
 314         {
 315                 MemSet(my_extra, 0,
 316                            sizeof(RecordIOData) - sizeof(ColumnIOData)
 317                            + ncolumns * sizeof(ColumnIOData));
 318                 my_extra->record_type = tupType;
 319                 my_extra->record_typmod = tupTypmod;
 320                 my_extra->ncolumns = ncolumns;
 321         }
 322
 323         values = (Datum *) palloc(ncolumns * sizeof(Datum));
 324         nulls = (char *) palloc(ncolumns * sizeof(char));
 325
 326         /* Break down the tuple into fields */
 327         heap_deformtuple(&tuple, tupdesc, values, nulls);
 328
 329         /* And build the result string */
 330         initStringInfo(&buf);
 331
 332         appendStringInfoChar(&buf, '(');
 333
 334         for (i = 0; i < ncolumns; i++)
 335         {
 336                 ColumnIOData *column_info = &my_extra->columns[i];
 337                 Oid                     column_type = tupdesc->attrs[i]->atttypid;
 338                 char       *value;
 339                 char       *tmp;
 340                 bool            nq;
 341
 342                 /* Ignore dropped columns in datatype */
 343                 if (tupdesc->attrs[i]->attisdropped)
 344                         continue;
 345
 346                 if (needComma)
 347                         appendStringInfoChar(&buf, ',');
 348                 needComma = true;
 349
 350                 if (nulls[i] == 'n')
 351                 {
 352                         /* emit nothing... */
 353                         continue;
 354                 }
 355
 356                 /*
 357                  * Convert the column value to text
 358                  */
 359                 if (column_info->column_type != column_type)
 360                 {
 361                         bool            typIsVarlena;
 362
 363                         getTypeOutputInfo(column_type,
 364                                                           &column_info->typiofunc,
 365                                                           &typIsVarlena);
 366                         fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
 367                                                   fcinfo->flinfo->fn_mcxt);
 368                         column_info->column_type = column_type;
 369                 }
 370
 371                 value = DatumGetCString(FunctionCall1(&column_info->proc,
 372                                                                                           values[i]));
 373
 374                 /* Detect whether we need double quotes for this value */
 375                 nq = (value[0] == '\0');        /* force quotes for empty string */
 376                 for (tmp = value; *tmp; tmp++)
 377                 {
 378                         char            ch = *tmp;
 379
 380                         if (ch == '"' || ch == '\\' ||
 381                                 ch == '(' || ch == ')' || ch == ',' ||
 382                                 isspace((unsigned char) ch))
 383                         {
 384                                 nq = true;
 385                                 break;
 386                         }
 387                 }
 388
 389                 /* And emit the string */
 390                 if (nq)
 391                         appendStringInfoChar(&buf, '"');
 392                 for (tmp = value; *tmp; tmp++)
 393                 {
 394                         char            ch = *tmp;
 395
 396                         if (ch == '"' || ch == '\\')
 397                                 appendStringInfoChar(&buf, ch);
 398                         appendStringInfoChar(&buf, ch);
 399                 }
 400                 if (nq)
 401                         appendStringInfoChar(&buf, '"');
 402         }
 403
 404         appendStringInfoChar(&buf, ')');
 405
 406         pfree(values);
 407         pfree(nulls);
 408
 409         PG_RETURN_CSTRING(buf.data);
 410 }
 411
 412 /*
 413  * record_recv          - binary input routine for any composite type.
 414  */
 415 Datum
 416 record_recv(PG_FUNCTION_ARGS)
 417 {
 418         StringInfo      buf = (StringInfo) PG_GETARG_POINTER(0);
 419         Oid                     tupType = PG_GETARG_OID(1);
 420         HeapTupleHeader result;
 421         int32           tupTypmod;
 422         TupleDesc       tupdesc;
 423         HeapTuple       tuple;
 424         RecordIOData *my_extra;
 425         int                     ncolumns;
 426         int                     usercols;
 427         int                     validcols;
 428         int                     i;
 429         Datum      *values;
 430         char       *nulls;
 431
 432         /*
 433          * Use the passed type unless it's RECORD; we can't support input of
 434          * anonymous types, mainly because there's no good way to figure out
 435          * which anonymous type is wanted.      Note that for RECORD, what we'll
 436          * probably actually get is RECORD's typelem, ie, zero.
 437          */
 438         if (tupType == InvalidOid || tupType == RECORDOID)
 439                 ereport(ERROR,
 440                                 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 441                 errmsg("input of anonymous composite types is not implemented")));
 442         tupTypmod = -1;                         /* for all non-anonymous types */
 443         tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
 444         ncolumns = tupdesc->natts;
 445
 446         /*
 447          * We arrange to look up the needed I/O info just once per series of
 448          * calls, assuming the record type doesn't change underneath us.
 449          */
 450         my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
 451         if (my_extra == NULL ||
 452                 my_extra->ncolumns != ncolumns)
 453         {
 454                 fcinfo->flinfo->fn_extra =
 455                         MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
 456                                                            sizeof(RecordIOData) - sizeof(ColumnIOData)
 457                                                            + ncolumns * sizeof(ColumnIOData));
 458                 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
 459                 my_extra->record_type = InvalidOid;
 460                 my_extra->record_typmod = 0;
 461         }
 462
 463         if (my_extra->record_type != tupType ||
 464                 my_extra->record_typmod != tupTypmod)
 465         {
 466                 MemSet(my_extra, 0,
 467                            sizeof(RecordIOData) - sizeof(ColumnIOData)
 468                            + ncolumns * sizeof(ColumnIOData));
 469                 my_extra->record_type = tupType;
 470                 my_extra->record_typmod = tupTypmod;
 471                 my_extra->ncolumns = ncolumns;
 472         }
 473
 474         values = (Datum *) palloc(ncolumns * sizeof(Datum));
 475         nulls = (char *) palloc(ncolumns * sizeof(char));
 476
 477         /* Fetch number of columns user thinks it has */
 478         usercols = pq_getmsgint(buf, 4);
 479
 480         /* Need to scan to count nondeleted columns */
 481         validcols = 0;
 482         for (i = 0; i < ncolumns; i++)
 483         {
 484                 if (!tupdesc->attrs[i]->attisdropped)
 485                         validcols++;
 486         }
 487         if (usercols != validcols)
 488                 ereport(ERROR,
 489                                 (errcode(ERRCODE_DATATYPE_MISMATCH),
 490                                  errmsg("wrong number of columns: %d, expected %d",
 491                                                 usercols, validcols)));
 492
 493         /* Process each column */
 494         for (i = 0; i < ncolumns; i++)
 495         {
 496                 ColumnIOData *column_info = &my_extra->columns[i];
 497                 Oid                     column_type = tupdesc->attrs[i]->atttypid;
 498                 Oid                     coltypoid;
 499                 int                     itemlen;
 500
 501                 /* Ignore dropped columns in datatype, but fill with nulls */
 502                 if (tupdesc->attrs[i]->attisdropped)
 503                 {
 504                         values[i] = (Datum) 0;
 505                         nulls[i] = 'n';
 506                         continue;
 507                 }
 508
 509                 /* Verify column datatype */
 510                 coltypoid = pq_getmsgint(buf, sizeof(Oid));
 511                 if (coltypoid != column_type)
 512                         ereport(ERROR,
 513                                         (errcode(ERRCODE_DATATYPE_MISMATCH),
 514                                          errmsg("wrong data type: %u, expected %u",
 515                                                         coltypoid, column_type)));
 516
 517                 /* Get and check the item length */
 518                 itemlen = pq_getmsgint(buf, 4);
 519                 if (itemlen < -1 || itemlen > (buf->len - buf->cursor))
 520                         ereport(ERROR,
 521                                         (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
 522                                          errmsg("insufficient data left in message")));
 523
 524                 if (itemlen == -1)
 525                 {
 526                         /* -1 length means NULL */
 527                         values[i] = (Datum) 0;
 528                         nulls[i] = 'n';
 529                 }
 530                 else
 531                 {
 532                         /*
 533                          * Rather than copying data around, we just set up a phony
 534                          * StringInfo pointing to the correct portion of the input
 535                          * buffer. We assume we can scribble on the input buffer so as
 536                          * to maintain the convention that StringInfos have a trailing
 537                          * null.
 538                          */
 539                         StringInfoData item_buf;
 540                         char            csave;
 541
 542                         item_buf.data = &buf->data[buf->cursor];
 543                         item_buf.maxlen = itemlen + 1;
 544                         item_buf.len = itemlen;
 545                         item_buf.cursor = 0;
 546
 547                         buf->cursor += itemlen;
 548
 549                         csave = buf->data[buf->cursor];
 550                         buf->data[buf->cursor] = '\0';
 551
 552                         /* Now call the column's receiveproc */
 553                         if (column_info->column_type != column_type)
 554                         {
 555                                 getTypeBinaryInputInfo(column_type,
 556                                                                            &column_info->typiofunc,
 557                                                                            &column_info->typioparam);
 558                                 fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
 559                                                           fcinfo->flinfo->fn_mcxt);
 560                                 column_info->column_type = column_type;
 561                         }
 562
 563                         values[i] = FunctionCall2(&column_info->proc,
 564                                                                           PointerGetDatum(&item_buf),
 565                                                           ObjectIdGetDatum(column_info->typioparam));
 566
 567                         nulls[i] = ' ';
 568
 569                         /* Trouble if it didn't eat the whole buffer */
 570                         if (item_buf.cursor != itemlen)
 571                                 ereport(ERROR,
 572                                                 (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
 573                                          errmsg("improper binary format in record column %d",
 574                                                         i + 1)));
 575
 576                         buf->data[buf->cursor] = csave;
 577                 }
 578         }
 579
 580         tuple = heap_formtuple(tupdesc, values, nulls);
 581
 582         /*
 583          * We cannot return tuple->t_data because heap_formtuple allocates it
 584          * as part of a larger chunk, and our caller may expect to be able to
 585          * pfree our result.  So must copy the info into a new palloc chunk.
 586          */
 587         result = (HeapTupleHeader) palloc(tuple->t_len);
 588         memcpy(result, tuple->t_data, tuple->t_len);
 589
 590         heap_freetuple(tuple);
 591         pfree(values);
 592         pfree(nulls);
 593
 594         PG_RETURN_HEAPTUPLEHEADER(result);
 595 }
 596
 597 /*
 598  * record_send          - binary output routine for any composite type.
 599  */
 600 Datum
 601 record_send(PG_FUNCTION_ARGS)
 602 {
 603         HeapTupleHeader rec = PG_GETARG_HEAPTUPLEHEADER(0);
 604         Oid                     tupType;
 605         int32           tupTypmod;
 606         TupleDesc       tupdesc;
 607         HeapTupleData tuple;
 608         RecordIOData *my_extra;
 609         int                     ncolumns;
 610         int                     validcols;
 611         int                     i;
 612         Datum      *values;
 613         char       *nulls;
 614         StringInfoData buf;
 615
 616         /* Extract type info from the tuple itself */
 617         tupType = HeapTupleHeaderGetTypeId(rec);
 618         tupTypmod = HeapTupleHeaderGetTypMod(rec);
 619         tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
 620         ncolumns = tupdesc->natts;
 621
 622         /* Build a temporary HeapTuple control structure */
 623         tuple.t_len = HeapTupleHeaderGetDatumLength(rec);
 624         ItemPointerSetInvalid(&(tuple.t_self));
 625         tuple.t_tableOid = InvalidOid;
 626         tuple.t_data = rec;
 627
 628         /*
 629          * We arrange to look up the needed I/O info just once per series of
 630          * calls, assuming the record type doesn't change underneath us.
 631          */
 632         my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
 633         if (my_extra == NULL ||
 634                 my_extra->ncolumns != ncolumns)
 635         {
 636                 fcinfo->flinfo->fn_extra =
 637                         MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
 638                                                            sizeof(RecordIOData) - sizeof(ColumnIOData)
 639                                                            + ncolumns * sizeof(ColumnIOData));
 640                 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
 641                 my_extra->record_type = InvalidOid;
 642                 my_extra->record_typmod = 0;
 643         }
 644
 645         if (my_extra->record_type != tupType ||
 646                 my_extra->record_typmod != tupTypmod)
 647         {
 648                 MemSet(my_extra, 0,
 649                            sizeof(RecordIOData) - sizeof(ColumnIOData)
 650                            + ncolumns * sizeof(ColumnIOData));
 651                 my_extra->record_type = tupType;
 652                 my_extra->record_typmod = tupTypmod;
 653                 my_extra->ncolumns = ncolumns;
 654         }
 655
 656         values = (Datum *) palloc(ncolumns * sizeof(Datum));
 657         nulls = (char *) palloc(ncolumns * sizeof(char));
 658
 659         /* Break down the tuple into fields */
 660         heap_deformtuple(&tuple, tupdesc, values, nulls);
 661
 662         /* And build the result string */
 663         pq_begintypsend(&buf);
 664
 665         /* Need to scan to count nondeleted columns */
 666         validcols = 0;
 667         for (i = 0; i < ncolumns; i++)
 668         {
 669                 if (!tupdesc->attrs[i]->attisdropped)
 670                         validcols++;
 671         }
 672         pq_sendint(&buf, validcols, 4);
 673
 674         for (i = 0; i < ncolumns; i++)
 675         {
 676                 ColumnIOData *column_info = &my_extra->columns[i];
 677                 Oid                     column_type = tupdesc->attrs[i]->atttypid;
 678                 bytea      *outputbytes;
 679
 680                 /* Ignore dropped columns in datatype */
 681                 if (tupdesc->attrs[i]->attisdropped)
 682                         continue;
 683
 684                 pq_sendint(&buf, column_type, sizeof(Oid));
 685
 686                 if (nulls[i] == 'n')
 687                 {
 688                         /* emit -1 data length to signify a NULL */
 689                         pq_sendint(&buf, -1, 4);
 690                         continue;
 691                 }
 692
 693                 /*
 694                  * Convert the column value to binary
 695                  */
 696                 if (column_info->column_type != column_type)
 697                 {
 698                         bool            typIsVarlena;
 699
 700                         getTypeBinaryOutputInfo(column_type,
 701                                                                         &column_info->typiofunc,
 702                                                                         &typIsVarlena);
 703                         fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
 704                                                   fcinfo->flinfo->fn_mcxt);
 705                         column_info->column_type = column_type;
 706                 }
 707
 708                 outputbytes = DatumGetByteaP(FunctionCall1(&column_info->proc,
 709                                                                                                    values[i]));
 710
 711                 /* We assume the result will not have been toasted */
 712                 pq_sendint(&buf, VARSIZE(outputbytes) - VARHDRSZ, 4);
 713                 pq_sendbytes(&buf, VARDATA(outputbytes),
 714                                          VARSIZE(outputbytes) - VARHDRSZ);
 715                 pfree(outputbytes);
 716         }
 717
 718         pfree(values);
 719         pfree(nulls);
 720
 721         PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
 722 }