text: /*-------------------------------------------------------------------------
   *
   * lsyscache.h
   *	  Convenience routines for common queries in the system catalog cache.
   *
   * Portions Copyright (c) 2016, Bitnine Inc.
   * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
   * Portions Copyright (c) 1994, Regents of the University of California
   *
   * src/include/utils/lsyscache.h
   *
   *-------------------------------------------------------------------------
   */
  #ifndef LSYSCACHE_H
  #define LSYSCACHE_H
  
  #include "access/attnum.h"
  #include "access/htup.h"
  #include "nodes/pg_list.h"
  
  /* Result list element for get_op_btree_interpretation */
  typedef struct OpBtreeInterpretation
  {
  	Oid			opfamily_id;	/* btree opfamily containing operator */
  	int			strategy;		/* its strategy number */
  	Oid			oplefttype;		/* declared left input datatype */
  	Oid			oprighttype;	/* declared right input datatype */
  } OpBtreeInterpretation;
  
  /* I/O function selector for get_type_io_data */
  typedef enum IOFuncSelector
  {
  	IOFunc_input,
  	IOFunc_output,
  	IOFunc_receive,
  	IOFunc_send
  } IOFuncSelector;
  
  /* Hook for plugins to get control in get_attavgwidth() */
  typedef int32 (*get_attavgwidth_hook_type) (Oid relid, AttrNumber attnum);
  extern PGDLLIMPORT get_attavgwidth_hook_type get_attavgwidth_hook;
  
  extern bool op_in_opfamily(Oid opno, Oid opfamily);
  extern int	get_op_opfamily_strategy(Oid opno, Oid opfamily);
  extern Oid	get_op_opfamily_sortfamily(Oid opno, Oid opfamily);
  extern void get_op_opfamily_properties(Oid opno, Oid opfamily, bool ordering_op,
  						   int *strategy,
  						   Oid *lefttype,
  						   Oid *righttype);
  extern Oid get_opfamily_member(Oid opfamily, Oid lefttype, Oid righttype,
  					int16 strategy);
  extern bool get_ordering_op_properties(Oid opno,
  						   Oid *opfamily, Oid *opcintype, int16 *strategy);
  extern Oid	get_equality_op_for_ordering_op(Oid opno, bool *reverse);
  extern Oid	get_ordering_op_for_equality_op(Oid opno, bool use_lhs_type);
  extern List *get_mergejoin_opfamilies(Oid opno);
  extern bool get_compatible_hash_operators(Oid opno,
  							  Oid *lhs_opno, Oid *rhs_opno);
  extern bool get_op_hash_functions(Oid opno,
  					  RegProcedure *lhs_procno, RegProcedure *rhs_procno);
  extern List *get_op_btree_interpretation(Oid opno);
  extern bool equality_ops_are_compatible(Oid opno1, Oid opno2);
  extern Oid get_opfamily_proc(Oid opfamily, Oid lefttype, Oid righttype,
  				  int16 procnum);
  extern char *get_attname(Oid relid, AttrNumber attnum);
  extern char *get_relid_attribute_name(Oid relid, AttrNumber attnum);
  extern AttrNumber get_attnum(Oid relid, const char *attname);
  extern Oid	get_atttype(Oid relid, AttrNumber attnum);
  extern int32 get_atttypmod(Oid relid, AttrNumber attnum);
  extern void get_atttypetypmodcoll(Oid relid, AttrNumber attnum,
  					  Oid *typid, int32 *typmod, Oid *collid);
  extern char *get_collation_name(Oid colloid);
  extern char *get_constraint_name(Oid conoid);
  extern char *get_language_name(Oid langoid, bool missing_ok);
  extern Oid	get_opclass_family(Oid opclass);
  extern Oid	get_opclass_input_type(Oid opclass);
  extern RegProcedure get_opcode(Oid opno);
  extern char *get_opname(Oid opno);
  extern Oid	get_op_rettype(Oid opno);
  extern void op_input_types(Oid opno, Oid *lefttype, Oid *righttype);
  extern bool op_mergejoinable(Oid opno, Oid inputtype);
  extern bool op_hashjoinable(Oid opno, Oid inputtype);
  extern bool op_strict(Oid opno);
  extern char op_volatile(Oid opno);
  extern Oid	get_commutator(Oid opno);
  extern Oid	get_negator(Oid opno);
  extern RegProcedure get_oprrest(Oid opno);
  extern RegProcedure get_oprjoin(Oid opno);
  extern char *get_func_name(Oid funcid);
  extern Oid	get_func_namespace(Oid funcid);
  extern Oid	get_func_rettype(Oid funcid);
  extern int	get_func_nargs(Oid funcid);
  extern Oid	get_func_signature(Oid funcid, Oid **argtypes, int *nargs);
  extern Oid	get_func_variadictype(Oid funcid);
  extern bool get_func_retset(Oid funcid);
  extern bool func_strict(Oid funcid);
  extern char func_volatile(Oid funcid);
  extern char func_parallel(Oid funcid);
  extern bool get_func_leakproof(Oid funcid);
  extern float4 get_func_cost(Oid funcid);
  extern float4 get_func_rows(Oid funcid);
  extern Oid	get_relname_relid(const char *relname, Oid relnamespace);
  extern char *get_rel_name(Oid relid);
  extern Oid	get_rel_namespace(Oid relid);
  extern Oid	get_rel_type_id(Oid relid);
  extern char get_rel_relkind(Oid relid);
  extern Oid	get_rel_tablespace(Oid relid);
  extern char get_rel_persistence(Oid relid);
  extern Oid	get_transform_fromsql(Oid typid, Oid langid, List *trftypes);
  extern Oid	get_transform_tosql(Oid typid, Oid langid, List *trftypes);
  extern bool get_typisdefined(Oid typid);
  extern int16 get_typlen(Oid typid);
  extern bool get_typbyval(Oid typid);
  extern void get_typlenbyval(Oid typid, int16 *typlen, bool *typbyval);
  extern void get_typlenbyvalalign(Oid typid, int16 *typlen, bool *typbyval,
  					 char *typalign);
  extern Oid	getTypeIOParam(HeapTuple typeTuple);
  extern void get_type_io_data(Oid typid,
  				 IOFuncSelector which_func,
  				 int16 *typlen,
  				 bool *typbyval,
  				 char *typalign,
  				 char *typdelim,
  				 Oid *typioparam,
  				 Oid *func);
  extern char get_typstorage(Oid typid);
  extern Node *get_typdefault(Oid typid);
  extern char get_typtype(Oid typid);
  extern bool type_is_rowtype(Oid typid);
  extern bool type_is_enum(Oid typid);
  extern bool type_is_range(Oid typid);
  extern void get_type_category_preferred(Oid typid,
  							char *typcategory,
  							bool *typispreferred);
  extern Oid	get_typ_typrelid(Oid typid);
  extern Oid	get_element_type(Oid typid);
  extern Oid	get_array_type(Oid typid);
  extern Oid	get_promoted_array_type(Oid typid);
  extern Oid	get_base_element_type(Oid typid);
  extern void getTypeInputInfo(Oid type, Oid *typInput, Oid *typIOParam);
  extern void getTypeOutputInfo(Oid type, Oid *typOutput, bool *typIsVarlena);
  extern void getTypeBinaryInputInfo(Oid type, Oid *typReceive, Oid *typIOParam);
  extern void getTypeBinaryOutputInfo(Oid type, Oid *typSend, bool *typIsVarlena);
  extern Oid	get_typmodin(Oid typid);
  extern Oid	get_typcollation(Oid typid);
  extern bool type_is_collatable(Oid typid);
  extern Oid	getBaseType(Oid typid);
  extern Oid	getBaseTypeAndTypmod(Oid typid, int32 *typmod);
  extern int32 get_typavgwidth(Oid typid, int32 typmod);
  extern int32 get_attavgwidth(Oid relid, AttrNumber attnum);
  extern bool get_attstatsslot(HeapTuple statstuple,
  				 Oid atttype, int32 atttypmod,
  				 int reqkind, Oid reqop,
  				 Oid *actualop,
  				 Datum **values, int *nvalues,
  				 float4 **numbers, int *nnumbers);
  extern void free_attstatsslot(Oid atttype,
  				  Datum *values, int nvalues,
  				  float4 *numbers, int nnumbers);
  extern char *get_namespace_name(Oid nspid);
  extern char *get_namespace_name_or_temp(Oid nspid);
  extern Oid	get_range_subtype(Oid rangeOid);
  
  extern Oid	get_graphname_oid(const char *graphname);
  extern char *get_labid_labname(Oid graphid, uint16 labid);
  extern Oid	get_labid_relid(Oid graphid, uint16 labid);
  extern bool labid_exists(Oid graphid, uint16 labid);
  extern Oid	get_labname_laboid(const char *labname, Oid graphid);
  extern uint16 get_labname_labid(const char *labname, Oid graphid);
  extern Oid	get_laboid_relid(Oid laboid);
  extern Oid	get_relid_laboid(Oid relid);
  
  #define type_is_array(typid)  (get_element_type(typid) != InvalidOid)
  /* type_is_array_domain accepts both plain arrays and domains over arrays */
  #define type_is_array_domain(typid)  (get_base_element_type(typid) != InvalidOid)
  
  #define TypeIsToastable(typid)	(get_typstorage(typid) != 'p')
  
  #endif   /* LSYSCACHE_H */
  