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3651a3e6fb
CREATE AGGREGATE aggname (input_type) (parameter_list) along with the old syntax where the input type was named in the parameter list. This fits more naturally with the way that the aggregate is identified in DROP AGGREGATE and other utility commands; furthermore it has a natural extension to handle multiple-input aggregates, where the basetype-parameter method would get ugly. In fact, this commit fixes the grammar and all the utility commands to support multiple-input aggregates; but DefineAggregate rejects it because the executor isn't fixed yet. I didn't do anything about treating agg(*) as a zero-input aggregate instead of artificially making it a one-input aggregate, but that should be considered in combination with supporting multi-input aggregates.
83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* parse_func.h
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*
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*
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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_func.h,v 1.56 2006/04/15 17:45:41 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARSER_FUNC_H
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#define PARSER_FUNC_H
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#include "catalog/namespace.h"
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#include "parser/parse_node.h"
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/*
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* This structure is used to explore the inheritance hierarchy above
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* nodes in the type tree in order to disambiguate among polymorphic
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* functions.
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*/
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typedef struct _InhPaths
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{
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int nsupers; /* number of superclasses */
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Oid self; /* this class */
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Oid *supervec; /* vector of superclasses */
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} InhPaths;
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/* Result codes for func_get_detail */
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typedef enum
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{
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FUNCDETAIL_NOTFOUND, /* no matching function */
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FUNCDETAIL_MULTIPLE, /* too many matching functions */
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FUNCDETAIL_NORMAL, /* found a matching regular function */
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FUNCDETAIL_AGGREGATE, /* found a matching aggregate function */
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FUNCDETAIL_COERCION /* it's a type coercion request */
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} FuncDetailCode;
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extern Node *ParseFuncOrColumn(ParseState *pstate,
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List *funcname, List *fargs,
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bool agg_star, bool agg_distinct, bool is_column,
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int location);
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extern FuncDetailCode func_get_detail(List *funcname, List *fargs,
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int nargs, Oid *argtypes,
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Oid *funcid, Oid *rettype,
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bool *retset, Oid **true_typeids);
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extern int func_match_argtypes(int nargs,
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Oid *input_typeids,
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FuncCandidateList raw_candidates,
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FuncCandidateList *candidates);
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extern FuncCandidateList func_select_candidate(int nargs,
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Oid *input_typeids,
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FuncCandidateList candidates);
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extern bool typeInheritsFrom(Oid subclassTypeId, Oid superclassTypeId);
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extern void make_fn_arguments(ParseState *pstate,
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List *fargs,
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Oid *actual_arg_types,
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Oid *declared_arg_types);
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extern const char *funcname_signature_string(const char *funcname,
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int nargs, const Oid *argtypes);
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extern const char *func_signature_string(List *funcname,
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int nargs, const Oid *argtypes);
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extern Oid LookupFuncName(List *funcname, int nargs, const Oid *argtypes,
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bool noError);
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extern Oid LookupFuncNameTypeNames(List *funcname, List *argtypes,
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bool noError);
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extern Oid LookupAggNameTypeNames(List *aggname, List *argtypes,
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bool noError);
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#endif /* PARSE_FUNC_H */
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