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Promote row expressions to full-fledged citizens of the expression syntax,
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.
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@ -15,7 +15,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/executor/execTuples.c,v 1.76 2004/04/01 21:28:44 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/executor/execTuples.c,v 1.77 2004/05/10 22:44:44 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -111,6 +111,7 @@
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#include "access/heapam.h"
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#include "catalog/pg_type.h"
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#include "executor/executor.h"
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#include "parser/parse_expr.h"
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#include "utils/lsyscache.h"
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#include "utils/typcache.h"
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@ -118,6 +119,7 @@
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static TupleDesc ExecTypeFromTLInternal(List *targetList,
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bool hasoid, bool skipjunk);
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/* ----------------------------------------------------------------
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* tuple table create/delete functions
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* ----------------------------------------------------------------
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@ -595,6 +597,38 @@ ExecTypeFromTLInternal(List *targetList, bool hasoid, bool skipjunk)
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return typeInfo;
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}
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/*
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* ExecTypeFromExprList - build a tuple descriptor from a list of Exprs
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*
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* Here we must make up an arbitrary set of field names.
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*/
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TupleDesc
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ExecTypeFromExprList(List *exprList)
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{
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TupleDesc typeInfo;
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List *l;
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int cur_resno = 1;
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char fldname[NAMEDATALEN];
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typeInfo = CreateTemplateTupleDesc(length(exprList), false);
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foreach(l, exprList)
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{
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Node *e = lfirst(l);
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sprintf(fldname, "f%d", cur_resno);
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TupleDescInitEntry(typeInfo,
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cur_resno++,
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fldname,
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exprType(e),
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exprTypmod(e),
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0);
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}
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return typeInfo;
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}
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/*
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* BlessTupleDesc - make a completed tuple descriptor useful for SRFs
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*
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