125 lines
4.3 KiB
C
125 lines
4.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* typcache.h
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* Type cache definitions.
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*
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* The type cache exists to speed lookup of certain information about data
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* types that is not directly available from a type's pg_type row.
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*
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* Portions Copyright (c) 1996-2012, 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/utils/typcache.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TYPCACHE_H
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#define TYPCACHE_H
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#include "access/tupdesc.h"
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#include "fmgr.h"
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/* TypeCacheEnumData is an opaque struct known only within typcache.c */
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struct TypeCacheEnumData;
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typedef struct TypeCacheEntry
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{
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/* typeId is the hash lookup key and MUST BE FIRST */
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Oid type_id; /* OID of the data type */
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/* some subsidiary information copied from the pg_type row */
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int16 typlen;
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bool typbyval;
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char typalign;
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char typstorage;
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char typtype;
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Oid typrelid;
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/*
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* Information obtained from opfamily entries
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*
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* These will be InvalidOid if no match could be found, or if the
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* information hasn't yet been requested. Also note that for array and
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* composite types, typcache.c checks that the contained types are
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* comparable or hashable before allowing eq_opr etc to become set.
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*/
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Oid btree_opf; /* the default btree opclass' family */
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Oid btree_opintype; /* the default btree opclass' opcintype */
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Oid hash_opf; /* the default hash opclass' family */
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Oid hash_opintype; /* the default hash opclass' opcintype */
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Oid eq_opr; /* the equality operator */
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Oid lt_opr; /* the less-than operator */
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Oid gt_opr; /* the greater-than operator */
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Oid cmp_proc; /* the btree comparison function */
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Oid hash_proc; /* the hash calculation function */
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/*
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* Pre-set-up fmgr call info for the equality operator, the btree
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* comparison function, and the hash calculation function. These are kept
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* in the type cache to avoid problems with memory leaks in repeated calls
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* to functions such as array_eq, array_cmp, hash_array. There is not
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* currently a need to maintain call info for the lt_opr or gt_opr.
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*/
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FmgrInfo eq_opr_finfo;
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FmgrInfo cmp_proc_finfo;
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FmgrInfo hash_proc_finfo;
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/*
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* Tuple descriptor if it's a composite type (row type). NULL if not
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* composite or information hasn't yet been requested. (NOTE: this is a
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* reference-counted tupledesc.)
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*/
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TupleDesc tupDesc;
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/*
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* Fields computed when TYPECACHE_RANGE_INFO is requested. Zeroes if
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* not a range type or information hasn't yet been requested. Note that
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* rng_cmp_proc_finfo could be different from the element type's default
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* btree comparison function.
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*/
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struct TypeCacheEntry *rngelemtype; /* range's element type */
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Oid rng_collation; /* collation for comparisons, if any */
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FmgrInfo rng_cmp_proc_finfo; /* comparison function */
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FmgrInfo rng_canonical_finfo; /* canonicalization function, if any */
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FmgrInfo rng_subdiff_finfo; /* difference function, if any */
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/* Private data, for internal use of typcache.c only */
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int flags; /* flags about what we've computed */
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/*
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* Private information about an enum type. NULL if not enum or
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* information hasn't been requested.
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*/
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struct TypeCacheEnumData *enumData;
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} TypeCacheEntry;
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/* Bit flags to indicate which fields a given caller needs to have set */
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#define TYPECACHE_EQ_OPR 0x0001
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#define TYPECACHE_LT_OPR 0x0002
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#define TYPECACHE_GT_OPR 0x0004
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#define TYPECACHE_CMP_PROC 0x0008
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#define TYPECACHE_HASH_PROC 0x0010
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#define TYPECACHE_EQ_OPR_FINFO 0x0020
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#define TYPECACHE_CMP_PROC_FINFO 0x0040
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#define TYPECACHE_HASH_PROC_FINFO 0x0080
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#define TYPECACHE_TUPDESC 0x0100
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#define TYPECACHE_BTREE_OPFAMILY 0x0200
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#define TYPECACHE_HASH_OPFAMILY 0x0400
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#define TYPECACHE_RANGE_INFO 0x0800
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extern TypeCacheEntry *lookup_type_cache(Oid type_id, int flags);
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extern TupleDesc lookup_rowtype_tupdesc(Oid type_id, int32 typmod);
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extern TupleDesc lookup_rowtype_tupdesc_noerror(Oid type_id, int32 typmod,
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bool noError);
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extern TupleDesc lookup_rowtype_tupdesc_copy(Oid type_id, int32 typmod);
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extern void assign_record_type_typmod(TupleDesc tupDesc);
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extern int compare_values_of_enum(TypeCacheEntry *tcache, Oid arg1, Oid arg2);
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#endif /* TYPCACHE_H */
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