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Diffstat (limited to 'src/backend/utils/cache/lsyscache.c')
| -rw-r--r-- | src/backend/utils/cache/lsyscache.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c index 552e498cf57..73138e0a5bb 100644 --- a/src/backend/utils/cache/lsyscache.c +++ b/src/backend/utils/cache/lsyscache.c @@ -2355,6 +2355,27 @@ get_array_type(Oid typid) } /* + * get_promoted_array_type + * + * The "promoted" type is what you'd get from an ARRAY(SELECT ...) + * construct, that is, either the corresponding "true" array type + * if the input is a scalar type that has such an array type, + * or the same type if the input is already a "true" array type. + * Returns InvalidOid if neither rule is satisfied. + */ +Oid +get_promoted_array_type(Oid typid) +{ + Oid array_type = get_array_type(typid); + + if (OidIsValid(array_type)) + return array_type; + if (OidIsValid(get_element_type(typid))) + return typid; + return InvalidOid; +} + +/* * get_base_element_type * Given the type OID, get the typelem, looking "through" any domain * to its underlying array type. |