| /*------------------------------------------------------------------------- |
| * |
| * 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) 2006-2010, Greenplum inc |
| * Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates. |
| * Portions Copyright (c) 1996-2021, 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. |
| * |
| *------------------------------------------------------------------------- |
| */ |
| #ifndef PG_CAST_H |
| #define PG_CAST_H |
| |
| #include "catalog/dependency.h" |
| #include "catalog/genbki.h" |
| #include "catalog/pg_cast_d.h" |
| |
| /* ---------------- |
| * 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; |
| |
| /* GPDB added foreign key definitions for gpcheckcat. */ |
| FOREIGN_KEY(castsource REFERENCES pg_type(oid)); |
| FOREIGN_KEY(casttarget REFERENCES pg_type(oid)); |
| FOREIGN_KEY(castfunc REFERENCES pg_proc(oid)); |
| |
| /* ---------------- |
| * 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, on pg_cast using btree(oid oid_ops)); |
| #define CastOidIndexId 2660 |
| DECLARE_UNIQUE_INDEX(pg_cast_source_target_index, 2661, on pg_cast using btree(castsource oid_ops, casttarget oid_ops)); |
| #define CastSourceTargetIndexId 2661 |
| |
| #ifdef EXPOSE_TO_CLIENT_CODE |
| |
| /* |
| * 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; |
| |
| #endif /* EXPOSE_TO_CLIENT_CODE */ |
| |
| |
| extern ObjectAddress CastCreate(Oid sourcetypeid, |
| Oid targettypeid, |
| Oid funcid, |
| char castcontext, |
| char castmethod, |
| DependencyType behavior); |
| |
| #endif /* PG_CAST_H */ |
