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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2020-03-10 11:28:23 -0300 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2020-03-10 11:28:23 -0300 |
| commit | 40b3e2c201af10c27a2c4c5bfcd029026b4cdff3 (patch) | |
| tree | c19e65a9b38c3ed42c26d58a25a349d0049a8606 /src/backend/utils/cache/lsyscache.c | |
| parent | 0a42a2e9ce8481a024d085f2cc526a366db8df59 (diff) | |
| download | postgresql-40b3e2c201af10c27a2c4c5bfcd029026b4cdff3.tar.gz postgresql-40b3e2c201af10c27a2c4c5bfcd029026b4cdff3.zip | |
Split out CreateCast into src/backend/catalog/pg_cast.c
This catalog-handling code was previously together with the rest of
CastCreate() in src/backend/commands/functioncmds.c. A future patch
will need a way to add casts internally, so this will be useful to have
separate.
Also, move the nearby get_cast_oid() function from functioncmds.c to
lsyscache.c, which seems a more natural place for it.
Author: Paul Jungwirth, minor edits by Álvaro
Discussion: https://postgr.es/m/20200309210003.GA19992@alvherre.pgsql
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 ---------- */ /* |