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16fd03e956
This adds combine, serial and deserial functions for the array_agg() and string_agg() aggregate functions, thus allowing these aggregates to partake in partial aggregations. This allows both parallel aggregation to take place when these aggregates are present and also allows additional partition-wise aggregation plan shapes to include plans that require additional aggregation once the partially aggregated results from the partitions have been combined. Author: David Rowley Reviewed-by: Andres Freund, Tomas Vondra, Stephen Frost, Tom Lane Discussion: https://postgr.es/m/CAKJS1f9sx_6GTcvd6TMuZnNtCh0VhBzhX6FZqw17TgVFH-ga_A@mail.gmail.com
65 lines
2 KiB
C
65 lines
2 KiB
C
/*-------------------------------------------------------------------------
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*
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* parse_agg.h
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* handle aggregates and window functions in parser
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*
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* Portions Copyright (c) 1996-2023, 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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* src/include/parser/parse_agg.h
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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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List *args, List *aggorder,
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bool agg_distinct);
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extern Node *transformGroupingFunc(ParseState *pstate, GroupingFunc *p);
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extern void transformWindowFuncCall(ParseState *pstate, WindowFunc *wfunc,
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WindowDef *windef);
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extern void parseCheckAggregates(ParseState *pstate, Query *qry);
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extern List *expand_grouping_sets(List *groupingSets, bool groupDistinct, int limit);
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extern int get_aggregate_argtypes(Aggref *aggref, Oid *inputTypes);
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extern Oid resolve_aggregate_transtype(Oid aggfuncid,
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Oid aggtranstype,
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Oid *inputTypes,
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int numArguments);
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extern bool agg_args_support_sendreceive(Aggref *aggref);
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extern void build_aggregate_transfn_expr(Oid *agg_input_types,
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int agg_num_inputs,
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int agg_num_direct_inputs,
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bool agg_variadic,
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Oid agg_state_type,
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Oid agg_input_collation,
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Oid transfn_oid,
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Oid invtransfn_oid,
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Expr **transfnexpr,
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Expr **invtransfnexpr);
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extern void build_aggregate_serialfn_expr(Oid serialfn_oid,
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Expr **serialfnexpr);
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extern void build_aggregate_deserialfn_expr(Oid deserialfn_oid,
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Expr **deserialfnexpr);
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extern void build_aggregate_finalfn_expr(Oid *agg_input_types,
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int num_finalfn_inputs,
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Oid agg_state_type,
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Oid agg_result_type,
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Oid agg_input_collation,
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Oid finalfn_oid,
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Expr **finalfnexpr);
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#endif /* PARSE_AGG_H */
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