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f213131f20
the SQL spec, viz IS NULL is true if all the row's fields are null, IS NOT NULL is true if all the row's fields are not null. The former coding got this right for a limited number of cases with IS NULL (ie, those where it could disassemble a ROW constructor at parse time), but was entirely wrong for IS NOT NULL. Per report from Teodor. I desisted from changing the behavior for arrays, since on closer inspection it's not clear that there's any support for that in the SQL spec. This probably needs more consideration.
121 lines
4.8 KiB
C
121 lines
4.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* lsyscache.h
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* Convenience routines for common queries in the system catalog cache.
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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/utils/lsyscache.h,v 1.106 2006/09/28 20:51:43 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef LSYSCACHE_H
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#define LSYSCACHE_H
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#include "access/attnum.h"
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#include "access/htup.h"
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#include "nodes/pg_list.h"
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/* I/O function selector for get_type_io_data */
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typedef enum IOFuncSelector
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{
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IOFunc_input,
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IOFunc_output,
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IOFunc_receive,
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IOFunc_send
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} IOFuncSelector;
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extern bool op_in_opclass(Oid opno, Oid opclass);
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extern int get_op_opclass_strategy(Oid opno, Oid opclass);
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extern void get_op_opclass_properties(Oid opno, Oid opclass,
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int *strategy, Oid *subtype,
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bool *recheck);
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extern Oid get_opclass_member(Oid opclass, Oid subtype, int16 strategy);
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extern Oid get_op_hash_function(Oid opno);
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extern void get_op_btree_interpretation(Oid opno,
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List **opclasses, List **opstrats);
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extern Oid get_opclass_proc(Oid opclass, Oid subtype, int16 procnum);
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extern char *get_attname(Oid relid, AttrNumber attnum);
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extern char *get_relid_attribute_name(Oid relid, AttrNumber attnum);
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extern AttrNumber get_attnum(Oid relid, const char *attname);
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extern Oid get_atttype(Oid relid, AttrNumber attnum);
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extern int32 get_atttypmod(Oid relid, AttrNumber attnum);
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extern void get_atttypetypmod(Oid relid, AttrNumber attnum,
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Oid *typid, int32 *typmod);
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extern bool opclass_is_btree(Oid opclass);
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extern bool opclass_is_hash(Oid opclass);
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extern bool opclass_is_default(Oid opclass);
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extern Oid get_opclass_input_type(Oid opclass);
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extern RegProcedure get_opcode(Oid opno);
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extern char *get_opname(Oid opno);
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extern void op_input_types(Oid opno, Oid *lefttype, Oid *righttype);
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extern bool op_mergejoinable(Oid opno, Oid *leftOp, Oid *rightOp);
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extern void op_mergejoin_crossops(Oid opno, Oid *ltop, Oid *gtop,
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RegProcedure *ltproc, RegProcedure *gtproc);
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extern bool op_hashjoinable(Oid opno);
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extern bool op_strict(Oid opno);
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extern char op_volatile(Oid opno);
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extern Oid get_commutator(Oid opno);
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extern Oid get_negator(Oid opno);
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extern RegProcedure get_oprrest(Oid opno);
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extern RegProcedure get_oprjoin(Oid opno);
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extern char *get_func_name(Oid funcid);
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extern Oid get_func_rettype(Oid funcid);
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extern int get_func_nargs(Oid funcid);
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extern Oid get_func_signature(Oid funcid, Oid **argtypes, int *nargs);
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extern bool get_func_retset(Oid funcid);
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extern bool func_strict(Oid funcid);
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extern char func_volatile(Oid funcid);
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extern Oid get_relname_relid(const char *relname, Oid relnamespace);
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extern char *get_rel_name(Oid relid);
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extern Oid get_rel_namespace(Oid relid);
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extern Oid get_rel_type_id(Oid relid);
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extern char get_rel_relkind(Oid relid);
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extern bool get_typisdefined(Oid typid);
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extern int16 get_typlen(Oid typid);
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extern bool get_typbyval(Oid typid);
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extern void get_typlenbyval(Oid typid, int16 *typlen, bool *typbyval);
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extern void get_typlenbyvalalign(Oid typid, int16 *typlen, bool *typbyval,
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char *typalign);
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extern Oid getTypeIOParam(HeapTuple typeTuple);
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extern void get_type_io_data(Oid typid,
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IOFuncSelector which_func,
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int16 *typlen,
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bool *typbyval,
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char *typalign,
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char *typdelim,
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Oid *typioparam,
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Oid *func);
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extern char get_typstorage(Oid typid);
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extern Node *get_typdefault(Oid typid);
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extern char get_typtype(Oid typid);
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extern bool type_is_rowtype(Oid typid);
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extern Oid get_typ_typrelid(Oid typid);
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extern Oid get_element_type(Oid typid);
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extern Oid get_array_type(Oid typid);
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extern void getTypeInputInfo(Oid type, Oid *typInput, Oid *typIOParam);
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extern void getTypeOutputInfo(Oid type, Oid *typOutput, bool *typIsVarlena);
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extern void getTypeBinaryInputInfo(Oid type, Oid *typReceive, Oid *typIOParam);
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extern void getTypeBinaryOutputInfo(Oid type, Oid *typSend, bool *typIsVarlena);
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extern Oid getBaseType(Oid typid);
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extern Oid getBaseTypeAndTypmod(Oid typid, int32 *typmod);
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extern int32 get_typavgwidth(Oid typid, int32 typmod);
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extern int32 get_attavgwidth(Oid relid, AttrNumber attnum);
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extern bool get_attstatsslot(HeapTuple statstuple,
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Oid atttype, int32 atttypmod,
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int reqkind, Oid reqop,
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Datum **values, int *nvalues,
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float4 **numbers, int *nnumbers);
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extern void free_attstatsslot(Oid atttype,
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Datum *values, int nvalues,
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float4 *numbers, int nnumbers);
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extern char *get_namespace_name(Oid nspid);
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extern Oid get_roleid(const char *rolname);
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extern Oid get_roleid_checked(const char *rolname);
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#define is_array_type(typid) (get_element_type(typid) != InvalidOid)
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#define TypeIsToastable(typid) (get_typstorage(typid) != 'p')
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#endif /* LSYSCACHE_H */
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