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postgresql/src/backend/utils/adt/rowtypes.c

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/*-------------------------------------------------------------------------
*
* rowtypes.c
* I/O and comparison functions for generic composite types.
*
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/adt/rowtypes.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include "access/detoast.h"
#include "access/htup_details.h"
#include "catalog/pg_type.h"
#include "common/hashfn.h"
#include "funcapi.h"
#include "libpq/pqformat.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/datum.h"
#include "utils/lsyscache.h"
#include "utils/typcache.h"
/*
* structure to cache metadata needed for record I/O
*/
typedef struct ColumnIOData
{
Oid column_type;
Oid typiofunc;
Oid typioparam;
bool typisvarlena;
FmgrInfo proc;
} ColumnIOData;
typedef struct RecordIOData
{
Oid record_type;
int32 record_typmod;
int ncolumns;
ColumnIOData columns[FLEXIBLE_ARRAY_MEMBER];
} RecordIOData;
/*
* structure to cache metadata needed for record comparison
*/
typedef struct ColumnCompareData
{
TypeCacheEntry *typentry; /* has everything we need, actually */
} ColumnCompareData;
typedef struct RecordCompareData
{
int ncolumns; /* allocated length of columns[] */
Oid record1_type;
int32 record1_typmod;
Oid record2_type;
int32 record2_typmod;
ColumnCompareData columns[FLEXIBLE_ARRAY_MEMBER];
} RecordCompareData;
/*
* record_in - input routine for any composite type.
*/
Datum
record_in(PG_FUNCTION_ARGS)
{
char *string = PG_GETARG_CSTRING(0);
Oid tupType = PG_GETARG_OID(1);
int32 tupTypmod = PG_GETARG_INT32(2);
Node *escontext = fcinfo->context;
HeapTupleHeader result;
TupleDesc tupdesc;
HeapTuple tuple;
RecordIOData *my_extra;
bool needComma = false;
int ncolumns;
int i;
char *ptr;
Datum *values;
bool *nulls;
StringInfoData buf;
check_stack_depth(); /* recurses for record-type columns */
/*
* Give a friendly error message if we did not get enough info to identify
* the target record type. (lookup_rowtype_tupdesc would fail anyway, but
* with a non-user-friendly message.) In ordinary SQL usage, we'll get -1
* for typmod, since composite types and RECORD have no type modifiers at
* the SQL level, and thus must fail for RECORD. However some callers can
* supply a valid typmod, and then we can do something useful for RECORD.
*/
if (tupType == RECORDOID && tupTypmod < 0)
ereturn(escontext, (Datum) 0,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("input of anonymous composite types is not implemented")));
/*
* This comes from the composite type's pg_type.oid and stores system oids
* in user tables, specifically DatumTupleFields. This oid must be
* preserved by binary upgrades.
*/
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
ncolumns = tupdesc->natts;
/*
* We arrange to look up the needed I/O info just once per series of
* calls, assuming the record type doesn't change underneath us.
*/
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns != ncolumns)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
offsetof(RecordIOData, columns) +
ncolumns * sizeof(ColumnIOData));
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
my_extra->record_type = InvalidOid;
my_extra->record_typmod = 0;
}
if (my_extra->record_type != tupType ||
my_extra->record_typmod != tupTypmod)
{
MemSet(my_extra, 0,
offsetof(RecordIOData, columns) +
ncolumns * sizeof(ColumnIOData));
my_extra->record_type = tupType;
my_extra->record_typmod = tupTypmod;
my_extra->ncolumns = ncolumns;
}
values = (Datum *) palloc(ncolumns * sizeof(Datum));
nulls = (bool *) palloc(ncolumns * sizeof(bool));
/*
* Scan the string. We use "buf" to accumulate the de-quoted data for
* each column, which is then fed to the appropriate input converter.
*/
ptr = string;
/* Allow leading whitespace */
while (*ptr && isspace((unsigned char) *ptr))
ptr++;
if (*ptr++ != '(')
{
errsave(escontext,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("malformed record literal: \"%s\"", string),
errdetail("Missing left parenthesis.")));
goto fail;
}
initStringInfo(&buf);
for (i = 0; i < ncolumns; i++)
{
Form_pg_attribute att = TupleDescAttr(tupdesc, i);
ColumnIOData *column_info = &my_extra->columns[i];
Oid column_type = att->atttypid;
char *column_data;
/* Ignore dropped columns in datatype, but fill with nulls */
if (att->attisdropped)
{
values[i] = (Datum) 0;
nulls[i] = true;
continue;
}
if (needComma)
{
/* Skip comma that separates prior field from this one */
if (*ptr == ',')
ptr++;
else
/* *ptr must be ')' */
{
errsave(escontext,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("malformed record literal: \"%s\"", string),
errdetail("Too few columns.")));
goto fail;
}
}
/* Check for null: completely empty input means null */
if (*ptr == ',' || *ptr == ')')
{
column_data = NULL;
nulls[i] = true;
}
else
{
/* Extract string for this column */
bool inquote = false;
resetStringInfo(&buf);
while (inquote || !(*ptr == ',' || *ptr == ')'))
{
char ch = *ptr++;
if (ch == '\0')
{
errsave(escontext,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("malformed record literal: \"%s\"",
string),
errdetail("Unexpected end of input.")));
goto fail;
}
if (ch == '\\')
{
if (*ptr == '\0')
{
errsave(escontext,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("malformed record literal: \"%s\"",
string),
errdetail("Unexpected end of input.")));
goto fail;
}
appendStringInfoChar(&buf, *ptr++);
}
else if (ch == '"')
{
if (!inquote)
inquote = true;
else if (*ptr == '"')
{
/* doubled quote within quote sequence */
appendStringInfoChar(&buf, *ptr++);
}
else
inquote = false;
}
else
appendStringInfoChar(&buf, ch);
}
column_data = buf.data;
nulls[i] = false;
}
/*
* Convert the column value
*/
if (column_info->column_type != column_type)
{
getTypeInputInfo(column_type,
&column_info->typiofunc,
&column_info->typioparam);
fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
fcinfo->flinfo->fn_mcxt);
column_info->column_type = column_type;
}
if (!InputFunctionCallSafe(&column_info->proc,
column_data,
column_info->typioparam,
att->atttypmod,
escontext,
&values[i]))
goto fail;
/*
* Prep for next column
*/
needComma = true;
}
if (*ptr++ != ')')
{
errsave(escontext,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("malformed record literal: \"%s\"", string),
errdetail("Too many columns.")));
goto fail;
}
/* Allow trailing whitespace */
while (*ptr && isspace((unsigned char) *ptr))
ptr++;
if (*ptr)
{
errsave(escontext,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("malformed record literal: \"%s\"", string),
errdetail("Junk after right parenthesis.")));
goto fail;
}
tuple = heap_form_tuple(tupdesc, values, nulls);
/*
* We cannot return tuple->t_data because heap_form_tuple allocates it as
* part of a larger chunk, and our caller may expect to be able to pfree
* our result. So must copy the info into a new palloc chunk.
*/
result = (HeapTupleHeader) palloc(tuple->t_len);
memcpy(result, tuple->t_data, tuple->t_len);
heap_freetuple(tuple);
pfree(buf.data);
pfree(values);
pfree(nulls);
ReleaseTupleDesc(tupdesc);
PG_RETURN_HEAPTUPLEHEADER(result);
/* exit here once we've done lookup_rowtype_tupdesc */
fail:
ReleaseTupleDesc(tupdesc);
PG_RETURN_NULL();
}
/*
* record_out - output routine for any composite type.
*/
Datum
record_out(PG_FUNCTION_ARGS)
{
HeapTupleHeader rec = PG_GETARG_HEAPTUPLEHEADER(0);
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc;
HeapTupleData tuple;
RecordIOData *my_extra;
bool needComma = false;
int ncolumns;
int i;
Datum *values;
bool *nulls;
StringInfoData buf;
check_stack_depth(); /* recurses for record-type columns */
/* Extract type info from the tuple itself */
tupType = HeapTupleHeaderGetTypeId(rec);
tupTypmod = HeapTupleHeaderGetTypMod(rec);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
ncolumns = tupdesc->natts;
/* Build a temporary HeapTuple control structure */
tuple.t_len = HeapTupleHeaderGetDatumLength(rec);
ItemPointerSetInvalid(&(tuple.t_self));
tuple.t_tableOid = InvalidOid;
tuple.t_data = rec;
/*
* We arrange to look up the needed I/O info just once per series of
* calls, assuming the record type doesn't change underneath us.
*/
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns != ncolumns)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
offsetof(RecordIOData, columns) +
ncolumns * sizeof(ColumnIOData));
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
my_extra->record_type = InvalidOid;
my_extra->record_typmod = 0;
}
if (my_extra->record_type != tupType ||
my_extra->record_typmod != tupTypmod)
{
MemSet(my_extra, 0,
offsetof(RecordIOData, columns) +
ncolumns * sizeof(ColumnIOData));
my_extra->record_type = tupType;
my_extra->record_typmod = tupTypmod;
my_extra->ncolumns = ncolumns;
}
values = (Datum *) palloc(ncolumns * sizeof(Datum));
nulls = (bool *) palloc(ncolumns * sizeof(bool));
/* Break down the tuple into fields */
heap_deform_tuple(&tuple, tupdesc, values, nulls);
/* And build the result string */
initStringInfo(&buf);
appendStringInfoChar(&buf, '(');
for (i = 0; i < ncolumns; i++)
{
Form_pg_attribute att = TupleDescAttr(tupdesc, i);
ColumnIOData *column_info = &my_extra->columns[i];
Oid column_type = att->atttypid;
Datum attr;
char *value;
char *tmp;
bool nq;
/* Ignore dropped columns in datatype */
if (att->attisdropped)
continue;
if (needComma)
appendStringInfoChar(&buf, ',');
needComma = true;
if (nulls[i])
{
/* emit nothing... */
continue;
}
/*
* Convert the column value to text
*/
if (column_info->column_type != column_type)
{
getTypeOutputInfo(column_type,
&column_info->typiofunc,
&column_info->typisvarlena);
fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
fcinfo->flinfo->fn_mcxt);
column_info->column_type = column_type;
}
attr = values[i];
value = OutputFunctionCall(&column_info->proc, attr);
/* Detect whether we need double quotes for this value */
nq = (value[0] == '\0'); /* force quotes for empty string */
for (tmp = value; *tmp; tmp++)
{
char ch = *tmp;
if (ch == '"' || ch == '\\' ||
ch == '(' || ch == ')' || ch == ',' ||
isspace((unsigned char) ch))
{
nq = true;
break;
}
}
/* And emit the string */
if (nq)
appendStringInfoCharMacro(&buf, '"');
for (tmp = value; *tmp; tmp++)
{
char ch = *tmp;
if (ch == '"' || ch == '\\')
appendStringInfoCharMacro(&buf, ch);
appendStringInfoCharMacro(&buf, ch);
}
if (nq)
appendStringInfoCharMacro(&buf, '"');
}
appendStringInfoChar(&buf, ')');
pfree(values);
pfree(nulls);
ReleaseTupleDesc(tupdesc);
PG_RETURN_CSTRING(buf.data);
}
/*
* record_recv - binary input routine for any composite type.
*/
Datum
record_recv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
Oid tupType = PG_GETARG_OID(1);
int32 tupTypmod = PG_GETARG_INT32(2);
HeapTupleHeader result;
TupleDesc tupdesc;
HeapTuple tuple;
RecordIOData *my_extra;
int ncolumns;
int usercols;
int validcols;
int i;
Datum *values;
bool *nulls;
check_stack_depth(); /* recurses for record-type columns */
/*
* Give a friendly error message if we did not get enough info to identify
* the target record type. (lookup_rowtype_tupdesc would fail anyway, but
* with a non-user-friendly message.) In ordinary SQL usage, we'll get -1
* for typmod, since composite types and RECORD have no type modifiers at
* the SQL level, and thus must fail for RECORD. However some callers can
* supply a valid typmod, and then we can do something useful for RECORD.
*/
if (tupType == RECORDOID && tupTypmod < 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("input of anonymous composite types is not implemented")));
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
ncolumns = tupdesc->natts;
/*
* We arrange to look up the needed I/O info just once per series of
* calls, assuming the record type doesn't change underneath us.
*/
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns != ncolumns)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
offsetof(RecordIOData, columns) +
ncolumns * sizeof(ColumnIOData));
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
my_extra->record_type = InvalidOid;
my_extra->record_typmod = 0;
}
if (my_extra->record_type != tupType ||
my_extra->record_typmod != tupTypmod)
{
MemSet(my_extra, 0,
offsetof(RecordIOData, columns) +
ncolumns * sizeof(ColumnIOData));
my_extra->record_type = tupType;
my_extra->record_typmod = tupTypmod;
my_extra->ncolumns = ncolumns;
}
values = (Datum *) palloc(ncolumns * sizeof(Datum));
nulls = (bool *) palloc(ncolumns * sizeof(bool));
/* Fetch number of columns user thinks it has */
usercols = pq_getmsgint(buf, 4);
/* Need to scan to count nondeleted columns */
validcols = 0;
for (i = 0; i < ncolumns; i++)
{
if (!TupleDescAttr(tupdesc, i)->attisdropped)
validcols++;
}
if (usercols != validcols)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("wrong number of columns: %d, expected %d",
usercols, validcols)));
/* Process each column */
for (i = 0; i < ncolumns; i++)
{
Form_pg_attribute att = TupleDescAttr(tupdesc, i);
ColumnIOData *column_info = &my_extra->columns[i];
Oid column_type = att->atttypid;
Oid coltypoid;
int itemlen;
StringInfoData item_buf;
StringInfo bufptr;
char csave;
/* Ignore dropped columns in datatype, but fill with nulls */
if (att->attisdropped)
{
values[i] = (Datum) 0;
nulls[i] = true;
continue;
}
/* Check column type recorded in the data */
coltypoid = pq_getmsgint(buf, sizeof(Oid));
/*
* From a security standpoint, it doesn't matter whether the input's
* column type matches what we expect: the column type's receive
* function has to be robust enough to cope with invalid data.
* However, from a user-friendliness standpoint, it's nicer to
* complain about type mismatches than to throw "improper binary
* format" errors. But there's a problem: only built-in types have
* OIDs that are stable enough to believe that a mismatch is a real
* issue. So complain only if both OIDs are in the built-in range.
* Otherwise, carry on with the column type we "should" be getting.
*/
if (coltypoid != column_type &&
coltypoid < FirstGenbkiObjectId &&
column_type < FirstGenbkiObjectId)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("binary data has type %u (%s) instead of expected %u (%s) in record column %d",
coltypoid,
format_type_extended(coltypoid, -1,
FORMAT_TYPE_ALLOW_INVALID),
column_type,
format_type_extended(column_type, -1,
FORMAT_TYPE_ALLOW_INVALID),
i + 1)));
/* Get and check the item length */
itemlen = pq_getmsgint(buf, 4);
if (itemlen < -1 || itemlen > (buf->len - buf->cursor))
ereport(ERROR,
(errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
errmsg("insufficient data left in message")));
if (itemlen == -1)
{
/* -1 length means NULL */
bufptr = NULL;
nulls[i] = true;
csave = 0; /* keep compiler quiet */
}
else
{
/*
* Rather than copying data around, we just set up a phony
* StringInfo pointing to the correct portion of the input buffer.
* We assume we can scribble on the input buffer so as to maintain
* the convention that StringInfos have a trailing null.
*/
item_buf.data = &buf->data[buf->cursor];
item_buf.maxlen = itemlen + 1;
item_buf.len = itemlen;
item_buf.cursor = 0;
buf->cursor += itemlen;
csave = buf->data[buf->cursor];
buf->data[buf->cursor] = '\0';
bufptr = &item_buf;
nulls[i] = false;
}
/* Now call the column's receiveproc */
if (column_info->column_type != column_type)
{
getTypeBinaryInputInfo(column_type,
&column_info->typiofunc,
&column_info->typioparam);
fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
fcinfo->flinfo->fn_mcxt);
column_info->column_type = column_type;
}
values[i] = ReceiveFunctionCall(&column_info->proc,
bufptr,
column_info->typioparam,
att->atttypmod);
if (bufptr)
{
/* Trouble if it didn't eat the whole buffer */
if (item_buf.cursor != itemlen)
ereport(ERROR,
(errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
errmsg("improper binary format in record column %d",
i + 1)));
buf->data[buf->cursor] = csave;
}
}
tuple = heap_form_tuple(tupdesc, values, nulls);
/*
* We cannot return tuple->t_data because heap_form_tuple allocates it as
* part of a larger chunk, and our caller may expect to be able to pfree
* our result. So must copy the info into a new palloc chunk.
*/
result = (HeapTupleHeader) palloc(tuple->t_len);
memcpy(result, tuple->t_data, tuple->t_len);
heap_freetuple(tuple);
pfree(values);
pfree(nulls);
ReleaseTupleDesc(tupdesc);
PG_RETURN_HEAPTUPLEHEADER(result);
}
/*
* record_send - binary output routine for any composite type.
*/
Datum
record_send(PG_FUNCTION_ARGS)
{
HeapTupleHeader rec = PG_GETARG_HEAPTUPLEHEADER(0);
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc;
HeapTupleData tuple;
RecordIOData *my_extra;
int ncolumns;
int validcols;
int i;
Datum *values;
bool *nulls;
StringInfoData buf;
check_stack_depth(); /* recurses for record-type columns */
/* Extract type info from the tuple itself */
tupType = HeapTupleHeaderGetTypeId(rec);
tupTypmod = HeapTupleHeaderGetTypMod(rec);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
ncolumns = tupdesc->natts;
/* Build a temporary HeapTuple control structure */
tuple.t_len = HeapTupleHeaderGetDatumLength(rec);
ItemPointerSetInvalid(&(tuple.t_self));
tuple.t_tableOid = InvalidOid;
tuple.t_data = rec;
/*
* We arrange to look up the needed I/O info just once per series of
* calls, assuming the record type doesn't change underneath us.
*/
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns != ncolumns)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
offsetof(RecordIOData, columns) +
ncolumns * sizeof(ColumnIOData));
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
my_extra->record_type = InvalidOid;
my_extra->record_typmod = 0;
}
if (my_extra->record_type != tupType ||
my_extra->record_typmod != tupTypmod)
{
MemSet(my_extra, 0,
offsetof(RecordIOData, columns) +
ncolumns * sizeof(ColumnIOData));
my_extra->record_type = tupType;
my_extra->record_typmod = tupTypmod;
my_extra->ncolumns = ncolumns;
}
values = (Datum *) palloc(ncolumns * sizeof(Datum));
nulls = (bool *) palloc(ncolumns * sizeof(bool));
/* Break down the tuple into fields */
heap_deform_tuple(&tuple, tupdesc, values, nulls);
/* And build the result string */
pq_begintypsend(&buf);
/* Need to scan to count nondeleted columns */
validcols = 0;
for (i = 0; i < ncolumns; i++)
{
if (!TupleDescAttr(tupdesc, i)->attisdropped)
validcols++;
}
pq_sendint32(&buf, validcols);
for (i = 0; i < ncolumns; i++)
{
Form_pg_attribute att = TupleDescAttr(tupdesc, i);
ColumnIOData *column_info = &my_extra->columns[i];
Oid column_type = att->atttypid;
Datum attr;
bytea *outputbytes;
/* Ignore dropped columns in datatype */
if (att->attisdropped)
continue;
pq_sendint32(&buf, column_type);
if (nulls[i])
{
/* emit -1 data length to signify a NULL */
pq_sendint32(&buf, -1);
continue;
}
/*
* Convert the column value to binary
*/
if (column_info->column_type != column_type)
{
getTypeBinaryOutputInfo(column_type,
&column_info->typiofunc,
&column_info->typisvarlena);
fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
fcinfo->flinfo->fn_mcxt);
column_info->column_type = column_type;
}
attr = values[i];
outputbytes = SendFunctionCall(&column_info->proc, attr);
pq_sendint32(&buf, VARSIZE(outputbytes) - VARHDRSZ);
pq_sendbytes(&buf, VARDATA(outputbytes),
VARSIZE(outputbytes) - VARHDRSZ);
}
pfree(values);
pfree(nulls);
ReleaseTupleDesc(tupdesc);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* record_cmp()
* Internal comparison function for records.
*
* Returns -1, 0 or 1
*
* Do not assume that the two inputs are exactly the same record type;
* for instance we might be comparing an anonymous ROW() construct against a
* named composite type. We will compare as long as they have the same number
* of non-dropped columns of the same types.
*/
static int
record_cmp(FunctionCallInfo fcinfo)
{
HeapTupleHeader record1 = PG_GETARG_HEAPTUPLEHEADER(0);
HeapTupleHeader record2 = PG_GETARG_HEAPTUPLEHEADER(1);
int result = 0;
Oid tupType1;
Oid tupType2;
int32 tupTypmod1;
int32 tupTypmod2;
TupleDesc tupdesc1;
TupleDesc tupdesc2;
HeapTupleData tuple1;
HeapTupleData tuple2;
int ncolumns1;
int ncolumns2;
RecordCompareData *my_extra;
int ncols;
Datum *values1;
Datum *values2;
bool *nulls1;
bool *nulls2;
int i1;
int i2;
int j;
check_stack_depth(); /* recurses for record-type columns */
/* Extract type info from the tuples */
tupType1 = HeapTupleHeaderGetTypeId(record1);
tupTypmod1 = HeapTupleHeaderGetTypMod(record1);
tupdesc1 = lookup_rowtype_tupdesc(tupType1, tupTypmod1);
ncolumns1 = tupdesc1->natts;
tupType2 = HeapTupleHeaderGetTypeId(record2);
tupTypmod2 = HeapTupleHeaderGetTypMod(record2);
tupdesc2 = lookup_rowtype_tupdesc(tupType2, tupTypmod2);
ncolumns2 = tupdesc2->natts;
/* Build temporary HeapTuple control structures */
tuple1.t_len = HeapTupleHeaderGetDatumLength(record1);
ItemPointerSetInvalid(&(tuple1.t_self));
tuple1.t_tableOid = InvalidOid;
tuple1.t_data = record1;
tuple2.t_len = HeapTupleHeaderGetDatumLength(record2);
ItemPointerSetInvalid(&(tuple2.t_self));
tuple2.t_tableOid = InvalidOid;
tuple2.t_data = record2;
/*
* We arrange to look up the needed comparison info just once per series
* of calls, assuming the record types don't change underneath us.
*/
ncols = Max(ncolumns1, ncolumns2);
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns < ncols)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
offsetof(RecordCompareData, columns) +
ncols * sizeof(ColumnCompareData));
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
my_extra->ncolumns = ncols;
my_extra->record1_type = InvalidOid;
my_extra->record1_typmod = 0;
my_extra->record2_type = InvalidOid;
my_extra->record2_typmod = 0;
}
if (my_extra->record1_type != tupType1 ||
my_extra->record1_typmod != tupTypmod1 ||
my_extra->record2_type != tupType2 ||
my_extra->record2_typmod != tupTypmod2)
{
MemSet(my_extra->columns, 0, ncols * sizeof(ColumnCompareData));
my_extra->record1_type = tupType1;
my_extra->record1_typmod = tupTypmod1;
my_extra->record2_type = tupType2;
my_extra->record2_typmod = tupTypmod2;
}
/* Break down the tuples into fields */
values1 = (Datum *) palloc(ncolumns1 * sizeof(Datum));
nulls1 = (bool *) palloc(ncolumns1 * sizeof(bool));
heap_deform_tuple(&tuple1, tupdesc1, values1, nulls1);
values2 = (Datum *) palloc(ncolumns2 * sizeof(Datum));
nulls2 = (bool *) palloc(ncolumns2 * sizeof(bool));
heap_deform_tuple(&tuple2, tupdesc2, values2, nulls2);
/*
* Scan corresponding columns, allowing for dropped columns in different
* places in the two rows. i1 and i2 are physical column indexes, j is
* the logical column index.
*/
i1 = i2 = j = 0;
while (i1 < ncolumns1 || i2 < ncolumns2)
{
Form_pg_attribute att1;
Form_pg_attribute att2;
TypeCacheEntry *typentry;
Oid collation;
/*
* Skip dropped columns
*/
if (i1 < ncolumns1 && TupleDescAttr(tupdesc1, i1)->attisdropped)
{
i1++;
continue;
}
if (i2 < ncolumns2 && TupleDescAttr(tupdesc2, i2)->attisdropped)
{
i2++;
continue;
}
if (i1 >= ncolumns1 || i2 >= ncolumns2)
break; /* we'll deal with mismatch below loop */
att1 = TupleDescAttr(tupdesc1, i1);
att2 = TupleDescAttr(tupdesc2, i2);
/*
* Have two matching columns, they must be same type
*/
if (att1->atttypid != att2->atttypid)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot compare dissimilar column types %s and %s at record column %d",
format_type_be(att1->atttypid),
format_type_be(att2->atttypid),
j + 1)));
/*
* If they're not same collation, we don't complain here, but the
* comparison function might.
*/
collation = att1->attcollation;
if (collation != att2->attcollation)
collation = InvalidOid;
/*
* Lookup the comparison function if not done already
*/
typentry = my_extra->columns[j].typentry;
if (typentry == NULL ||
typentry->type_id != att1->atttypid)
{
typentry = lookup_type_cache(att1->atttypid,
TYPECACHE_CMP_PROC_FINFO);
if (!OidIsValid(typentry->cmp_proc_finfo.fn_oid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_FUNCTION),
errmsg("could not identify a comparison function for type %s",
format_type_be(typentry->type_id))));
my_extra->columns[j].typentry = typentry;
}
/*
* We consider two NULLs equal; NULL > not-NULL.
*/
if (!nulls1[i1] || !nulls2[i2])
{
LOCAL_FCINFO(locfcinfo, 2);
int32 cmpresult;
if (nulls1[i1])
{
/* arg1 is greater than arg2 */
result = 1;
break;
}
if (nulls2[i2])
{
/* arg1 is less than arg2 */
result = -1;
break;
}
/* Compare the pair of elements */
InitFunctionCallInfoData(*locfcinfo, &typentry->cmp_proc_finfo, 2,
collation, NULL, NULL);
locfcinfo->args[0].value = values1[i1];
locfcinfo->args[0].isnull = false;
locfcinfo->args[1].value = values2[i2];
locfcinfo->args[1].isnull = false;
cmpresult = DatumGetInt32(FunctionCallInvoke(locfcinfo));
/* We don't expect comparison support functions to return null */
Assert(!locfcinfo->isnull);
if (cmpresult < 0)
{
/* arg1 is less than arg2 */
result = -1;
break;
}
else if (cmpresult > 0)
{
/* arg1 is greater than arg2 */
result = 1;
break;
}
}
/* equal, so continue to next column */
i1++, i2++, j++;
}
/*
* If we didn't break out of the loop early, check for column count
* mismatch. (We do not report such mismatch if we found unequal column
* values; is that a feature or a bug?)
*/
if (result == 0)
{
if (i1 != ncolumns1 || i2 != ncolumns2)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot compare record types with different numbers of columns")));
}
pfree(values1);
pfree(nulls1);
pfree(values2);
pfree(nulls2);
ReleaseTupleDesc(tupdesc1);
ReleaseTupleDesc(tupdesc2);
/* Avoid leaking memory when handed toasted input. */
PG_FREE_IF_COPY(record1, 0);
PG_FREE_IF_COPY(record2, 1);
return result;
}
/*
* record_eq :
* compares two records for equality
* result :
* returns true if the records are equal, false otherwise.
*
* Note: we do not use record_cmp here, since equality may be meaningful in
* datatypes that don't have a total ordering (and hence no btree support).
*/
Datum
record_eq(PG_FUNCTION_ARGS)
{
HeapTupleHeader record1 = PG_GETARG_HEAPTUPLEHEADER(0);
HeapTupleHeader record2 = PG_GETARG_HEAPTUPLEHEADER(1);
bool result = true;
Oid tupType1;
Oid tupType2;
int32 tupTypmod1;
int32 tupTypmod2;
TupleDesc tupdesc1;
TupleDesc tupdesc2;
HeapTupleData tuple1;
HeapTupleData tuple2;
int ncolumns1;
int ncolumns2;
RecordCompareData *my_extra;
int ncols;
Datum *values1;
Datum *values2;
bool *nulls1;
bool *nulls2;
int i1;
int i2;
int j;
check_stack_depth(); /* recurses for record-type columns */
/* Extract type info from the tuples */
tupType1 = HeapTupleHeaderGetTypeId(record1);
tupTypmod1 = HeapTupleHeaderGetTypMod(record1);
tupdesc1 = lookup_rowtype_tupdesc(tupType1, tupTypmod1);
ncolumns1 = tupdesc1->natts;
tupType2 = HeapTupleHeaderGetTypeId(record2);
tupTypmod2 = HeapTupleHeaderGetTypMod(record2);
tupdesc2 = lookup_rowtype_tupdesc(tupType2, tupTypmod2);
ncolumns2 = tupdesc2->natts;
/* Build temporary HeapTuple control structures */
tuple1.t_len = HeapTupleHeaderGetDatumLength(record1);
ItemPointerSetInvalid(&(tuple1.t_self));
tuple1.t_tableOid = InvalidOid;
tuple1.t_data = record1;
tuple2.t_len = HeapTupleHeaderGetDatumLength(record2);
ItemPointerSetInvalid(&(tuple2.t_self));
tuple2.t_tableOid = InvalidOid;
tuple2.t_data = record2;
/*
* We arrange to look up the needed comparison info just once per series
* of calls, assuming the record types don't change underneath us.
*/
ncols = Max(ncolumns1, ncolumns2);
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns < ncols)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
offsetof(RecordCompareData, columns) +
ncols * sizeof(ColumnCompareData));
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
my_extra->ncolumns = ncols;
my_extra->record1_type = InvalidOid;
my_extra->record1_typmod = 0;
my_extra->record2_type = InvalidOid;
my_extra->record2_typmod = 0;
}
if (my_extra->record1_type != tupType1 ||
my_extra->record1_typmod != tupTypmod1 ||
my_extra->record2_type != tupType2 ||
my_extra->record2_typmod != tupTypmod2)
{
MemSet(my_extra->columns, 0, ncols * sizeof(ColumnCompareData));
my_extra->record1_type = tupType1;
my_extra->record1_typmod = tupTypmod1;
my_extra->record2_type = tupType2;
my_extra->record2_typmod = tupTypmod2;
}
/* Break down the tuples into fields */
values1 = (Datum *) palloc(ncolumns1 * sizeof(Datum));
nulls1 = (bool *) palloc(ncolumns1 * sizeof(bool));
heap_deform_tuple(&tuple1, tupdesc1, values1, nulls1);
values2 = (Datum *) palloc(ncolumns2 * sizeof(Datum));
nulls2 = (bool *) palloc(ncolumns2 * sizeof(bool));
heap_deform_tuple(&tuple2, tupdesc2, values2, nulls2);
/*
* Scan corresponding columns, allowing for dropped columns in different
* places in the two rows. i1 and i2 are physical column indexes, j is
* the logical column index.
*/
i1 = i2 = j = 0;
while (i1 < ncolumns1 || i2 < ncolumns2)
{
LOCAL_FCINFO(locfcinfo, 2);
Form_pg_attribute att1;
Form_pg_attribute att2;
TypeCacheEntry *typentry;
Oid collation;
bool oprresult;
/*
* Skip dropped columns
*/
if (i1 < ncolumns1 && TupleDescAttr(tupdesc1, i1)->attisdropped)
{
i1++;
continue;
}
if (i2 < ncolumns2 && TupleDescAttr(tupdesc2, i2)->attisdropped)
{
i2++;
continue;
}
if (i1 >= ncolumns1 || i2 >= ncolumns2)
break; /* we'll deal with mismatch below loop */
att1 = TupleDescAttr(tupdesc1, i1);
att2 = TupleDescAttr(tupdesc2, i2);
/*
* Have two matching columns, they must be same type
*/
if (att1->atttypid != att2->atttypid)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot compare dissimilar column types %s and %s at record column %d",
format_type_be(att1->atttypid),
format_type_be(att2->atttypid),
j + 1)));
/*
* If they're not same collation, we don't complain here, but the
* equality function might.
*/
collation = att1->attcollation;
if (collation != att2->attcollation)
collation = InvalidOid;
/*
* Lookup the equality function if not done already
*/
typentry = my_extra->columns[j].typentry;
if (typentry == NULL ||
typentry->type_id != att1->atttypid)
{
typentry = lookup_type_cache(att1->atttypid,
TYPECACHE_EQ_OPR_FINFO);
if (!OidIsValid(typentry->eq_opr_finfo.fn_oid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_FUNCTION),
errmsg("could not identify an equality operator for type %s",
format_type_be(typentry->type_id))));
my_extra->columns[j].typentry = typentry;
}
/*
* We consider two NULLs equal; NULL > not-NULL.
*/
if (!nulls1[i1] || !nulls2[i2])
{
if (nulls1[i1] || nulls2[i2])
{
result = false;
break;
}
/* Compare the pair of elements */
InitFunctionCallInfoData(*locfcinfo, &typentry->eq_opr_finfo, 2,
collation, NULL, NULL);
locfcinfo->args[0].value = values1[i1];
locfcinfo->args[0].isnull = false;
locfcinfo->args[1].value = values2[i2];
locfcinfo->args[1].isnull = false;
oprresult = DatumGetBool(FunctionCallInvoke(locfcinfo));
if (locfcinfo->isnull || !oprresult)
{
result = false;
break;
}
}
/* equal, so continue to next column */
i1++, i2++, j++;
}
/*
* If we didn't break out of the loop early, check for column count
* mismatch. (We do not report such mismatch if we found unequal column
* values; is that a feature or a bug?)
*/
if (result)
{
if (i1 != ncolumns1 || i2 != ncolumns2)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot compare record types with different numbers of columns")));
}
pfree(values1);
pfree(nulls1);
pfree(values2);
pfree(nulls2);
ReleaseTupleDesc(tupdesc1);
ReleaseTupleDesc(tupdesc2);
/* Avoid leaking memory when handed toasted input. */
PG_FREE_IF_COPY(record1, 0);
PG_FREE_IF_COPY(record2, 1);
PG_RETURN_BOOL(result);
}
Datum
record_ne(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(!DatumGetBool(record_eq(fcinfo)));
}
Datum
record_lt(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(record_cmp(fcinfo) < 0);
}
Datum
record_gt(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(record_cmp(fcinfo) > 0);
}
Datum
record_le(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(record_cmp(fcinfo) <= 0);
}
Datum
record_ge(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(record_cmp(fcinfo) >= 0);
}
Datum
btrecordcmp(PG_FUNCTION_ARGS)
{
PG_RETURN_INT32(record_cmp(fcinfo));
}
/*
* record_image_cmp :
* Internal byte-oriented comparison function for records.
*
* Returns -1, 0 or 1
*
* Note: The normal concepts of "equality" do not apply here; different
* representation of values considered to be equal are not considered to be
* identical. As an example, for the citext type 'A' and 'a' are equal, but
* they are not identical.
*/
static int
record_image_cmp(FunctionCallInfo fcinfo)
{
HeapTupleHeader record1 = PG_GETARG_HEAPTUPLEHEADER(0);
HeapTupleHeader record2 = PG_GETARG_HEAPTUPLEHEADER(1);
int result = 0;
Oid tupType1;
Oid tupType2;
int32 tupTypmod1;
int32 tupTypmod2;
TupleDesc tupdesc1;
TupleDesc tupdesc2;
HeapTupleData tuple1;
HeapTupleData tuple2;
int ncolumns1;
int ncolumns2;
RecordCompareData *my_extra;
int ncols;
Datum *values1;
Datum *values2;
bool *nulls1;
bool *nulls2;
int i1;
int i2;
int j;
/* Extract type info from the tuples */
tupType1 = HeapTupleHeaderGetTypeId(record1);
tupTypmod1 = HeapTupleHeaderGetTypMod(record1);
tupdesc1 = lookup_rowtype_tupdesc(tupType1, tupTypmod1);
ncolumns1 = tupdesc1->natts;
tupType2 = HeapTupleHeaderGetTypeId(record2);
tupTypmod2 = HeapTupleHeaderGetTypMod(record2);
tupdesc2 = lookup_rowtype_tupdesc(tupType2, tupTypmod2);
ncolumns2 = tupdesc2->natts;
/* Build temporary HeapTuple control structures */
tuple1.t_len = HeapTupleHeaderGetDatumLength(record1);
ItemPointerSetInvalid(&(tuple1.t_self));
tuple1.t_tableOid = InvalidOid;
tuple1.t_data = record1;
tuple2.t_len = HeapTupleHeaderGetDatumLength(record2);
ItemPointerSetInvalid(&(tuple2.t_self));
tuple2.t_tableOid = InvalidOid;
tuple2.t_data = record2;
/*
* We arrange to look up the needed comparison info just once per series
* of calls, assuming the record types don't change underneath us.
*/
ncols = Max(ncolumns1, ncolumns2);
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns < ncols)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
offsetof(RecordCompareData, columns) +
ncols * sizeof(ColumnCompareData));
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
my_extra->ncolumns = ncols;
my_extra->record1_type = InvalidOid;
my_extra->record1_typmod = 0;
my_extra->record2_type = InvalidOid;
my_extra->record2_typmod = 0;
}
if (my_extra->record1_type != tupType1 ||
my_extra->record1_typmod != tupTypmod1 ||
my_extra->record2_type != tupType2 ||
my_extra->record2_typmod != tupTypmod2)
{
MemSet(my_extra->columns, 0, ncols * sizeof(ColumnCompareData));
my_extra->record1_type = tupType1;
my_extra->record1_typmod = tupTypmod1;
my_extra->record2_type = tupType2;
my_extra->record2_typmod = tupTypmod2;
}
/* Break down the tuples into fields */
values1 = (Datum *) palloc(ncolumns1 * sizeof(Datum));
nulls1 = (bool *) palloc(ncolumns1 * sizeof(bool));
heap_deform_tuple(&tuple1, tupdesc1, values1, nulls1);
values2 = (Datum *) palloc(ncolumns2 * sizeof(Datum));
nulls2 = (bool *) palloc(ncolumns2 * sizeof(bool));
heap_deform_tuple(&tuple2, tupdesc2, values2, nulls2);
/*
* Scan corresponding columns, allowing for dropped columns in different
* places in the two rows. i1 and i2 are physical column indexes, j is
* the logical column index.
*/
i1 = i2 = j = 0;
while (i1 < ncolumns1 || i2 < ncolumns2)
{
Form_pg_attribute att1;
Form_pg_attribute att2;
/*
* Skip dropped columns
*/
if (i1 < ncolumns1 && TupleDescAttr(tupdesc1, i1)->attisdropped)
{
i1++;
continue;
}
if (i2 < ncolumns2 && TupleDescAttr(tupdesc2, i2)->attisdropped)
{
i2++;
continue;
}
if (i1 >= ncolumns1 || i2 >= ncolumns2)
break; /* we'll deal with mismatch below loop */
att1 = TupleDescAttr(tupdesc1, i1);
att2 = TupleDescAttr(tupdesc2, i2);
/*
* Have two matching columns, they must be same type
*/
if (att1->atttypid != att2->atttypid)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot compare dissimilar column types %s and %s at record column %d",
format_type_be(att1->atttypid),
format_type_be(att2->atttypid),
j + 1)));
/*
* The same type should have the same length (or both should be
* variable).
*/
Assert(att1->attlen == att2->attlen);
/*
* We consider two NULLs equal; NULL > not-NULL.
*/
if (!nulls1[i1] || !nulls2[i2])
{
int cmpresult = 0;
if (nulls1[i1])
{
/* arg1 is greater than arg2 */
result = 1;
break;
}
if (nulls2[i2])
{
/* arg1 is less than arg2 */
result = -1;
break;
}
/* Compare the pair of elements */
if (att1->attbyval)
{
if (values1[i1] != values2[i2])
cmpresult = (values1[i1] < values2[i2]) ? -1 : 1;
}
else if (att1->attlen > 0)
{
cmpresult = memcmp(DatumGetPointer(values1[i1]),
DatumGetPointer(values2[i2]),
att1->attlen);
}
else if (att1->attlen == -1)
{
Size len1,
len2;
struct varlena *arg1val;
struct varlena *arg2val;
len1 = toast_raw_datum_size(values1[i1]);
len2 = toast_raw_datum_size(values2[i2]);
arg1val = PG_DETOAST_DATUM_PACKED(values1[i1]);
arg2val = PG_DETOAST_DATUM_PACKED(values2[i2]);
cmpresult = memcmp(VARDATA_ANY(arg1val),
VARDATA_ANY(arg2val),
Min(len1, len2) - VARHDRSZ);
if ((cmpresult == 0) && (len1 != len2))
cmpresult = (len1 < len2) ? -1 : 1;
if ((Pointer) arg1val != (Pointer) values1[i1])
pfree(arg1val);
if ((Pointer) arg2val != (Pointer) values2[i2])
pfree(arg2val);
}
else
elog(ERROR, "unexpected attlen: %d", att1->attlen);
if (cmpresult < 0)
{
/* arg1 is less than arg2 */
result = -1;
break;
}
else if (cmpresult > 0)
{
/* arg1 is greater than arg2 */
result = 1;
break;
}
}
/* equal, so continue to next column */
i1++, i2++, j++;
}
/*
* If we didn't break out of the loop early, check for column count
* mismatch. (We do not report such mismatch if we found unequal column
* values; is that a feature or a bug?)
*/
if (result == 0)
{
if (i1 != ncolumns1 || i2 != ncolumns2)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot compare record types with different numbers of columns")));
}
pfree(values1);
pfree(nulls1);
pfree(values2);
pfree(nulls2);
ReleaseTupleDesc(tupdesc1);
ReleaseTupleDesc(tupdesc2);
/* Avoid leaking memory when handed toasted input. */
PG_FREE_IF_COPY(record1, 0);
PG_FREE_IF_COPY(record2, 1);
return result;
}
/*
* record_image_eq :
* compares two records for identical contents, based on byte images
* result :
* returns true if the records are identical, false otherwise.
*
* Note: we do not use record_image_cmp here, since we can avoid
* de-toasting for unequal lengths this way.
*/
Datum
record_image_eq(PG_FUNCTION_ARGS)
{
HeapTupleHeader record1 = PG_GETARG_HEAPTUPLEHEADER(0);
HeapTupleHeader record2 = PG_GETARG_HEAPTUPLEHEADER(1);
bool result = true;
Oid tupType1;
Oid tupType2;
int32 tupTypmod1;
int32 tupTypmod2;
TupleDesc tupdesc1;
TupleDesc tupdesc2;
HeapTupleData tuple1;
HeapTupleData tuple2;
int ncolumns1;
int ncolumns2;
RecordCompareData *my_extra;
int ncols;
Datum *values1;
Datum *values2;
bool *nulls1;
bool *nulls2;
int i1;
int i2;
int j;
/* Extract type info from the tuples */
tupType1 = HeapTupleHeaderGetTypeId(record1);
tupTypmod1 = HeapTupleHeaderGetTypMod(record1);
tupdesc1 = lookup_rowtype_tupdesc(tupType1, tupTypmod1);
ncolumns1 = tupdesc1->natts;
tupType2 = HeapTupleHeaderGetTypeId(record2);
tupTypmod2 = HeapTupleHeaderGetTypMod(record2);
tupdesc2 = lookup_rowtype_tupdesc(tupType2, tupTypmod2);
ncolumns2 = tupdesc2->natts;
/* Build temporary HeapTuple control structures */
tuple1.t_len = HeapTupleHeaderGetDatumLength(record1);
ItemPointerSetInvalid(&(tuple1.t_self));
tuple1.t_tableOid = InvalidOid;
tuple1.t_data = record1;
tuple2.t_len = HeapTupleHeaderGetDatumLength(record2);
ItemPointerSetInvalid(&(tuple2.t_self));
tuple2.t_tableOid = InvalidOid;
tuple2.t_data = record2;
/*
* We arrange to look up the needed comparison info just once per series
* of calls, assuming the record types don't change underneath us.
*/
ncols = Max(ncolumns1, ncolumns2);
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns < ncols)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
offsetof(RecordCompareData, columns) +
ncols * sizeof(ColumnCompareData));
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
my_extra->ncolumns = ncols;
my_extra->record1_type = InvalidOid;
my_extra->record1_typmod = 0;
my_extra->record2_type = InvalidOid;
my_extra->record2_typmod = 0;
}
if (my_extra->record1_type != tupType1 ||
my_extra->record1_typmod != tupTypmod1 ||
my_extra->record2_type != tupType2 ||
my_extra->record2_typmod != tupTypmod2)
{
MemSet(my_extra->columns, 0, ncols * sizeof(ColumnCompareData));
my_extra->record1_type = tupType1;
my_extra->record1_typmod = tupTypmod1;
my_extra->record2_type = tupType2;
my_extra->record2_typmod = tupTypmod2;
}
/* Break down the tuples into fields */
values1 = (Datum *) palloc(ncolumns1 * sizeof(Datum));
nulls1 = (bool *) palloc(ncolumns1 * sizeof(bool));
heap_deform_tuple(&tuple1, tupdesc1, values1, nulls1);
values2 = (Datum *) palloc(ncolumns2 * sizeof(Datum));
nulls2 = (bool *) palloc(ncolumns2 * sizeof(bool));
heap_deform_tuple(&tuple2, tupdesc2, values2, nulls2);
/*
* Scan corresponding columns, allowing for dropped columns in different
* places in the two rows. i1 and i2 are physical column indexes, j is
* the logical column index.
*/
i1 = i2 = j = 0;
while (i1 < ncolumns1 || i2 < ncolumns2)
{
Form_pg_attribute att1;
Form_pg_attribute att2;
/*
* Skip dropped columns
*/
if (i1 < ncolumns1 && TupleDescAttr(tupdesc1, i1)->attisdropped)
{
i1++;
continue;
}
if (i2 < ncolumns2 && TupleDescAttr(tupdesc2, i2)->attisdropped)
{
i2++;
continue;
}
if (i1 >= ncolumns1 || i2 >= ncolumns2)
break; /* we'll deal with mismatch below loop */
att1 = TupleDescAttr(tupdesc1, i1);
att2 = TupleDescAttr(tupdesc2, i2);
/*
* Have two matching columns, they must be same type
*/
if (att1->atttypid != att2->atttypid)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot compare dissimilar column types %s and %s at record column %d",
format_type_be(att1->atttypid),
format_type_be(att2->atttypid),
j + 1)));
/*
* We consider two NULLs equal; NULL > not-NULL.
*/
if (!nulls1[i1] || !nulls2[i2])
{
if (nulls1[i1] || nulls2[i2])
{
result = false;
break;
}
/* Compare the pair of elements */
result = datum_image_eq(values1[i1], values2[i2], att1->attbyval, att2->attlen);
if (!result)
break;
}
/* equal, so continue to next column */
i1++, i2++, j++;
}
/*
* If we didn't break out of the loop early, check for column count
* mismatch. (We do not report such mismatch if we found unequal column
* values; is that a feature or a bug?)
*/
if (result)
{
if (i1 != ncolumns1 || i2 != ncolumns2)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot compare record types with different numbers of columns")));
}
pfree(values1);
pfree(nulls1);
pfree(values2);
pfree(nulls2);
ReleaseTupleDesc(tupdesc1);
ReleaseTupleDesc(tupdesc2);
/* Avoid leaking memory when handed toasted input. */
PG_FREE_IF_COPY(record1, 0);
PG_FREE_IF_COPY(record2, 1);
PG_RETURN_BOOL(result);
}
Datum
record_image_ne(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(!DatumGetBool(record_image_eq(fcinfo)));
}
Datum
record_image_lt(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(record_image_cmp(fcinfo) < 0);
}
Datum
record_image_gt(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(record_image_cmp(fcinfo) > 0);
}
Datum
record_image_le(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(record_image_cmp(fcinfo) <= 0);
}
Datum
record_image_ge(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(record_image_cmp(fcinfo) >= 0);
}
Datum
btrecordimagecmp(PG_FUNCTION_ARGS)
{
PG_RETURN_INT32(record_image_cmp(fcinfo));
}
/*
* Row type hash functions
*/
Datum
hash_record(PG_FUNCTION_ARGS)
{
HeapTupleHeader record = PG_GETARG_HEAPTUPLEHEADER(0);
uint32 result = 0;
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc;
HeapTupleData tuple;
int ncolumns;
RecordCompareData *my_extra;
Datum *values;
bool *nulls;
check_stack_depth(); /* recurses for record-type columns */
/* Extract type info from tuple */
tupType = HeapTupleHeaderGetTypeId(record);
tupTypmod = HeapTupleHeaderGetTypMod(record);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
ncolumns = tupdesc->natts;
/* Build temporary HeapTuple control structure */
tuple.t_len = HeapTupleHeaderGetDatumLength(record);
ItemPointerSetInvalid(&(tuple.t_self));
tuple.t_tableOid = InvalidOid;
tuple.t_data = record;
/*
* We arrange to look up the needed hashing info just once per series of
* calls, assuming the record type doesn't change underneath us.
*/
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns < ncolumns)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
offsetof(RecordCompareData, columns) +
ncolumns * sizeof(ColumnCompareData));
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
my_extra->ncolumns = ncolumns;
my_extra->record1_type = InvalidOid;
my_extra->record1_typmod = 0;
}
if (my_extra->record1_type != tupType ||
my_extra->record1_typmod != tupTypmod)
{
MemSet(my_extra->columns, 0, ncolumns * sizeof(ColumnCompareData));
my_extra->record1_type = tupType;
my_extra->record1_typmod = tupTypmod;
}
/* Break down the tuple into fields */
values = (Datum *) palloc(ncolumns * sizeof(Datum));
nulls = (bool *) palloc(ncolumns * sizeof(bool));
heap_deform_tuple(&tuple, tupdesc, values, nulls);
for (int i = 0; i < ncolumns; i++)
{
Form_pg_attribute att;
TypeCacheEntry *typentry;
uint32 element_hash;
att = TupleDescAttr(tupdesc, i);
if (att->attisdropped)
continue;
/*
* Lookup the hash function if not done already
*/
typentry = my_extra->columns[i].typentry;
if (typentry == NULL ||
typentry->type_id != att->atttypid)
{
typentry = lookup_type_cache(att->atttypid,
TYPECACHE_HASH_PROC_FINFO);
if (!OidIsValid(typentry->hash_proc_finfo.fn_oid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_FUNCTION),
errmsg("could not identify a hash function for type %s",
format_type_be(typentry->type_id))));
my_extra->columns[i].typentry = typentry;
}
/* Compute hash of element */
if (nulls[i])
{
element_hash = 0;
}
else
{
LOCAL_FCINFO(locfcinfo, 1);
InitFunctionCallInfoData(*locfcinfo, &typentry->hash_proc_finfo, 1,
att->attcollation, NULL, NULL);
locfcinfo->args[0].value = values[i];
locfcinfo->args[0].isnull = false;
element_hash = DatumGetUInt32(FunctionCallInvoke(locfcinfo));
/* We don't expect hash support functions to return null */
Assert(!locfcinfo->isnull);
}
/* see hash_array() */
result = (result << 5) - result + element_hash;
}
pfree(values);
pfree(nulls);
ReleaseTupleDesc(tupdesc);
/* Avoid leaking memory when handed toasted input. */
PG_FREE_IF_COPY(record, 0);
PG_RETURN_UINT32(result);
}
Datum
hash_record_extended(PG_FUNCTION_ARGS)
{
HeapTupleHeader record = PG_GETARG_HEAPTUPLEHEADER(0);
uint64 seed = PG_GETARG_INT64(1);
uint64 result = 0;
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc;
HeapTupleData tuple;
int ncolumns;
RecordCompareData *my_extra;
Datum *values;
bool *nulls;
check_stack_depth(); /* recurses for record-type columns */
/* Extract type info from tuple */
tupType = HeapTupleHeaderGetTypeId(record);
tupTypmod = HeapTupleHeaderGetTypMod(record);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
ncolumns = tupdesc->natts;
/* Build temporary HeapTuple control structure */
tuple.t_len = HeapTupleHeaderGetDatumLength(record);
ItemPointerSetInvalid(&(tuple.t_self));
tuple.t_tableOid = InvalidOid;
tuple.t_data = record;
/*
* We arrange to look up the needed hashing info just once per series of
* calls, assuming the record type doesn't change underneath us.
*/
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns < ncolumns)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
offsetof(RecordCompareData, columns) +
ncolumns * sizeof(ColumnCompareData));
my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
my_extra->ncolumns = ncolumns;
my_extra->record1_type = InvalidOid;
my_extra->record1_typmod = 0;
}
if (my_extra->record1_type != tupType ||
my_extra->record1_typmod != tupTypmod)
{
MemSet(my_extra->columns, 0, ncolumns * sizeof(ColumnCompareData));
my_extra->record1_type = tupType;
my_extra->record1_typmod = tupTypmod;
}
/* Break down the tuple into fields */
values = (Datum *) palloc(ncolumns * sizeof(Datum));
nulls = (bool *) palloc(ncolumns * sizeof(bool));
heap_deform_tuple(&tuple, tupdesc, values, nulls);
for (int i = 0; i < ncolumns; i++)
{
Form_pg_attribute att;
TypeCacheEntry *typentry;
uint64 element_hash;
att = TupleDescAttr(tupdesc, i);
if (att->attisdropped)
continue;
/*
* Lookup the hash function if not done already
*/
typentry = my_extra->columns[i].typentry;
if (typentry == NULL ||
typentry->type_id != att->atttypid)
{
typentry = lookup_type_cache(att->atttypid,
TYPECACHE_HASH_EXTENDED_PROC_FINFO);
if (!OidIsValid(typentry->hash_extended_proc_finfo.fn_oid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_FUNCTION),
errmsg("could not identify an extended hash function for type %s",
format_type_be(typentry->type_id))));
my_extra->columns[i].typentry = typentry;
}
/* Compute hash of element */
if (nulls[i])
{
element_hash = 0;
}
else
{
LOCAL_FCINFO(locfcinfo, 2);
InitFunctionCallInfoData(*locfcinfo, &typentry->hash_extended_proc_finfo, 2,
att->attcollation, NULL, NULL);
locfcinfo->args[0].value = values[i];
locfcinfo->args[0].isnull = false;
locfcinfo->args[1].value = Int64GetDatum(seed);
locfcinfo->args[0].isnull = false;
element_hash = DatumGetUInt64(FunctionCallInvoke(locfcinfo));
/* We don't expect hash support functions to return null */
Assert(!locfcinfo->isnull);
}
/* see hash_array_extended() */
result = (result << 5) - result + element_hash;
}
pfree(values);
pfree(nulls);
ReleaseTupleDesc(tupdesc);
/* Avoid leaking memory when handed toasted input. */
PG_FREE_IF_COPY(record, 0);
PG_RETURN_UINT64(result);
}
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