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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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19
src/backend/nodes/readfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.168 2004/05/08 21:21:18 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.169 2004/05/10 22:44:44 tgl Exp $
*
* NOTES
* Path and Plan nodes do not have any readfuncs support, because we
@ -628,6 +628,21 @@ _readArrayExpr(void)
READ_DONE();
}
/*
* _readRowExpr
*/
static RowExpr *
_readRowExpr(void)
{
READ_LOCALS(RowExpr);
READ_NODE_FIELD(args);
READ_OID_FIELD(row_typeid);
READ_ENUM_FIELD(row_format, CoercionForm);
READ_DONE();
}
/*
* _readCoalesceExpr
*/
@ -978,6 +993,8 @@ parseNodeString(void)
return_value = _readCaseTestExpr();
else if (MATCH("ARRAY", 5))
return_value = _readArrayExpr();
else if (MATCH("ROW", 3))
return_value = _readRowExpr();
else if (MATCH("COALESCE", 8))
return_value = _readCoalesceExpr();
else if (MATCH("NULLIFEXPR", 10))