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108fe47301
the opportunity to treat COUNT(*) as a zero-argument aggregate instead of the old hack that equated it to COUNT(1); this is materially cleaner (no more weird ANYOID cases) and ought to be at least a tiny bit faster. Original patch by Sergey Koposov; review, documentation, simple regression tests, pg_dump and psql support by moi.
31 lines
925 B
C
31 lines
925 B
C
/*-------------------------------------------------------------------------
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*
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* parse_agg.h
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* handle aggregates in parser
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*
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* Portions Copyright (c) 1996-2006, 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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* $PostgreSQL: pgsql/src/include/parser/parse_agg.h,v 1.34 2006/07/27 19:52:07 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARSE_AGG_H
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#define PARSE_AGG_H
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#include "parser/parse_node.h"
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extern void transformAggregateCall(ParseState *pstate, Aggref *agg);
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extern void parseCheckAggregates(ParseState *pstate, Query *qry);
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extern void build_aggregate_fnexprs(Oid *agg_input_types,
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int agg_num_inputs,
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Oid agg_state_type,
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Oid agg_result_type,
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Oid transfn_oid,
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Oid finalfn_oid,
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Expr **transfnexpr,
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Expr **finalfnexpr);
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#endif /* PARSE_AGG_H */
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