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Promote row expressions to full-fledged citizens of the expression syntax,

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rather than allowing them only in a few special cases as before.  In
particular you can now pass a ROW() construct to a function that accepts
a rowtype parameter.  Internal generation of RowExprs fixes a number of
corner cases that used to not work very well, such as referencing the
whole-row result of a JOIN or subquery.  This represents a further step in
the work I started a month or so back to make rowtype values into
first-class citizens.
This commit is contained in:
Tom Lane
2004-05-10 22:44:49 +00:00
parent 9a939886ac
commit 2f63232d30
34 changed files with 1281 additions and 551 deletions
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36
src/backend/executor/execTuples.c
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@ -15,7 +15,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execTuples.c,v 1.76 2004/04/01 21:28:44 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/execTuples.c,v 1.77 2004/05/10 22:44:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -111,6 +111,7 @@
#include "access/heapam.h"
#include "catalog/pg_type.h"
#include "executor/executor.h"
#include "parser/parse_expr.h"
#include "utils/lsyscache.h"
#include "utils/typcache.h"
@ -118,6 +119,7 @@
static TupleDesc ExecTypeFromTLInternal(List *targetList,
bool hasoid, bool skipjunk);
/* ----------------------------------------------------------------
* tuple table create/delete functions
* ----------------------------------------------------------------
@ -595,6 +597,38 @@ ExecTypeFromTLInternal(List *targetList, bool hasoid, bool skipjunk)
return typeInfo;
}
/*
* ExecTypeFromExprList - build a tuple descriptor from a list of Exprs
*
* Here we must make up an arbitrary set of field names.
*/
TupleDesc
ExecTypeFromExprList(List *exprList)
{
TupleDesc typeInfo;
List *l;
int cur_resno = 1;
char fldname[NAMEDATALEN];
typeInfo = CreateTemplateTupleDesc(length(exprList), false);
foreach(l, exprList)
{
Node *e = lfirst(l);
sprintf(fldname, "f%d", cur_resno);
TupleDescInitEntry(typeInfo,
cur_resno++,
fldname,
exprType(e),
exprTypmod(e),
0);
}
return typeInfo;
}
/*
* BlessTupleDesc - make a completed tuple descriptor useful for SRFs
*