| /*------------------------------------------------------------------------- | |
| * | |
| * pg_cast.h | |
| * definition of the "type casts" system catalog (pg_cast) | |
| * | |
| * As of Postgres 8.0, pg_cast describes not only type coercion functions | |
| * but also length coercion functions. | |
| * | |
| * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group | |
| * Portions Copyright (c) 1994, Regents of the University of California | |
| * | |
| * src/include/catalog/pg_cast.h | |
| * | |
| * NOTES | |
| * The Catalog.pm module reads this file and derives schema | |
| * information. | |
| * | |
| *------------------------------------------------------------------------- | |
| */ | |
| /* ---------------- | |
| * pg_cast definition. cpp turns this into | |
| * typedef struct FormData_pg_cast | |
| * ---------------- | |
| */ | |
| CATALOG(pg_cast,2605,CastRelationId) | |
| { | |
| Oid oid; /* oid */ | |
| /* source datatype for cast */ | |
| Oid castsource BKI_LOOKUP(pg_type); | |
| /* destination datatype for cast */ | |
| Oid casttarget BKI_LOOKUP(pg_type); | |
| /* cast function; 0 = binary coercible */ | |
| Oid castfunc BKI_LOOKUP_OPT(pg_proc); | |
| /* contexts in which cast can be used */ | |
| char castcontext; | |
| /* cast method */ | |
| char castmethod; | |
| } FormData_pg_cast; | |
| /* ---------------- | |
| * Form_pg_cast corresponds to a pointer to a tuple with | |
| * the format of pg_cast relation. | |
| * ---------------- | |
| */ | |
| typedef FormData_pg_cast *Form_pg_cast; | |
| DECLARE_UNIQUE_INDEX_PKEY(pg_cast_oid_index, 2660, CastOidIndexId, on pg_cast using btree(oid oid_ops)); | |
| DECLARE_UNIQUE_INDEX(pg_cast_source_target_index, 2661, CastSourceTargetIndexId, on pg_cast using btree(castsource oid_ops, casttarget oid_ops)); | |
| /* | |
| * The allowable values for pg_cast.castcontext are specified by this enum. | |
| * Since castcontext is stored as a "char", we use ASCII codes for human | |
| * convenience in reading the table. Note that internally to the backend, | |
| * these values are converted to the CoercionContext enum (see primnodes.h), | |
| * which is defined to sort in a convenient order; the ASCII codes don't | |
| * have to sort in any special order. | |
| */ | |
| typedef enum CoercionCodes | |
| { | |
| COERCION_CODE_IMPLICIT = 'i', /* coercion in context of expression */ | |
| COERCION_CODE_ASSIGNMENT = 'a', /* coercion in context of assignment */ | |
| COERCION_CODE_EXPLICIT = 'e' /* explicit cast operation */ | |
| } CoercionCodes; | |
| /* | |
| * The allowable values for pg_cast.castmethod are specified by this enum. | |
| * Since castmethod is stored as a "char", we use ASCII codes for human | |
| * convenience in reading the table. | |
| */ | |
| typedef enum CoercionMethod | |
| { | |
| COERCION_METHOD_FUNCTION = 'f', /* use a function */ | |
| COERCION_METHOD_BINARY = 'b', /* types are binary-compatible */ | |
| COERCION_METHOD_INOUT = 'i' /* use input/output functions */ | |
| } CoercionMethod; | |
| extern ObjectAddress CastCreate(Oid sourcetypeid, | |
| Oid targettypeid, | |
| Oid funcid, | |
| Oid incastid, | |
| Oid outcastid, | |
| char castcontext, | |
| char castmethod, | |
| DependencyType behavior); | |