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6eeb95f0f5
now has an RTE of its own, and references to its outputs now are Vars referencing the JOIN RTE, rather than CASE-expressions. This allows reverse-listing in ruleutils.c to use the correct alias easily, rather than painfully reverse-engineering the alias namespace as it used to do. Also, nested FULL JOINs work correctly, because the result of the inner joins are simple Vars that the planner can cope with. This fixes a bug reported a couple times now, notably by Tatsuo on 18-Nov-01. The alias Vars are expanded into COALESCE expressions where needed at the very end of planning, rather than during parsing. Also, beginnings of support for showing plan qualifier expressions in EXPLAIN. There are probably still cases that need work. initdb forced due to change of stored-rule representation.
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* parsetree.h
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* Routines to access various components and subcomponents of
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* parse trees.
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*
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: parsetree.h,v 1.17 2002/03/12 00:52:04 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARSETREE_H
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#define PARSETREE_H
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#include "nodes/parsenodes.h"
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#include "nodes/pg_list.h" /* for nth(), etc */
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/* ----------------
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* range table macros
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* ----------------
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*/
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/*
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* rt_fetch
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* rt_store
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*
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* Access and (destructively) replace rangetable entries.
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*/
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#define rt_fetch(rangetable_index, rangetable) \
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((RangeTblEntry *) nth((rangetable_index)-1, rangetable))
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#define rt_store(rangetable_index, rangetable, rt) \
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set_nth(rangetable, (rangetable_index)-1, rt)
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/*
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* getrelid
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*
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* Given the range index of a relation, return the corresponding
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* relation OID. Note that InvalidOid will be returned if the
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* RTE is for a non-relation-type RTE.
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*/
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#define getrelid(rangeindex,rangetable) \
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(rt_fetch(rangeindex, rangetable)->relid)
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/*
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* Given an RTE and an attribute number, return the appropriate
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* variable name or alias for that attribute of that RTE.
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*/
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extern char *get_rte_attribute_name(RangeTblEntry *rte, AttrNumber attnum);
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/*
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* Given an RTE and an attribute number, return the appropriate
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* type and typemod info for that attribute of that RTE.
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*/
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extern void get_rte_attribute_type(RangeTblEntry *rte, AttrNumber attnum,
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Oid *vartype, int32 *vartypmod);
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#endif /* PARSETREE_H */
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