diff options
Diffstat (limited to 'src/backend/utils/cache/lsyscache.c')
| -rw-r--r-- | src/backend/utils/cache/lsyscache.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c index 400e7689fe2..6b24369de8f 100644 --- a/src/backend/utils/cache/lsyscache.c +++ b/src/backend/utils/cache/lsyscache.c @@ -23,6 +23,7 @@ #include "catalog/pg_am.h" #include "catalog/pg_amop.h" #include "catalog/pg_amproc.h" +#include "catalog/pg_cast.h" #include "catalog/pg_collation.h" #include "catalog/pg_constraint.h" #include "catalog/pg_language.h" @@ -908,6 +909,31 @@ get_atttypetypmodcoll(Oid relid, AttrNumber attnum, ReleaseSysCache(tp); } +/* ---------- PG_CAST CACHE ---------- */ + +/* + * get_cast_oid - given two type OIDs, look up a cast OID + * + * If missing_ok is false, throw an error if the cast is not found. If + * true, just return InvalidOid. + */ +Oid +get_cast_oid(Oid sourcetypeid, Oid targettypeid, bool missing_ok) +{ + Oid oid; + + oid = GetSysCacheOid2(CASTSOURCETARGET, Anum_pg_cast_oid, + ObjectIdGetDatum(sourcetypeid), + ObjectIdGetDatum(targettypeid)); + if (!OidIsValid(oid) && !missing_ok) + ereport(ERROR, + (errcode(ERRCODE_UNDEFINED_OBJECT), + errmsg("cast from type %s to type %s does not exist", + format_type_be(sourcetypeid), + format_type_be(targettypeid)))); + return oid; +} + /* ---------- COLLATION CACHE ---------- */ /* |