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postgres/src/include/executor/nodeSetOp.h

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Reimplementation of UNION/INTERSECT/EXCEPT. INTERSECT/EXCEPT now meet the SQL92 semantics, including support for ALL option. All three can be used in subqueries and views. DISTINCT and ORDER BY work now in views, too. This rewrite fixes many problems with cross-datatype UNIONs and INSERT/SELECT where the SELECT yields different datatypes than the INSERT needs. I did that by making UNION subqueries and SELECT in INSERT be treated like subselects-in-FROM, thereby allowing an extra level of targetlist where the datatype conversions can be inserted safely. INITDB NEEDED!
26 years ago
/*-------------------------------------------------------------------------
*
* nodeSetOp.h
*
*
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: nodeSetOp.h,v 1.1 2000/10/05 19:11:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef NODESETOP_H
#define NODESETOP_H
#include "nodes/plannodes.h"
extern TupleTableSlot *ExecSetOp(SetOp *node);
extern bool ExecInitSetOp(SetOp *node, EState *estate, Plan *parent);
extern int ExecCountSlotsSetOp(SetOp *node);
extern void ExecEndSetOp(SetOp *node);
extern void ExecReScanSetOp(SetOp *node, ExprContext *exprCtxt, Plan *parent);
#endif /* NODESETOP_H */