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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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23
src/backend/nodes/equalfuncs.c
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@@ -18,7 +18,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.219 2004/05/05 04:48:45 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.220 2004/05/10 22:44:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -423,6 +423,24 @@ _equalArrayExpr(ArrayExpr *a, ArrayExpr *b)
return true;
}
static bool
_equalRowExpr(RowExpr *a, RowExpr *b)
{
COMPARE_NODE_FIELD(args);
COMPARE_SCALAR_FIELD(row_typeid);
/*
* Special-case COERCE_DONTCARE, so that planner can build coercion
* nodes that are equal() to both explicit and implicit coercions.
*/
if (a->row_format != b->row_format &&
a->row_format != COERCE_DONTCARE &&
b->row_format != COERCE_DONTCARE)
return false;
return true;
}
static bool
_equalCoalesceExpr(CoalesceExpr *a, CoalesceExpr *b)
{
@@ -1748,6 +1766,9 @@ equal(void *a, void *b)
case T_ArrayExpr:
retval = _equalArrayExpr(a, b);
break;
case T_RowExpr:
retval = _equalRowExpr(a, b);
break;
case T_CoalesceExpr:
retval = _equalCoalesceExpr(a, b);
break;