/**
* Resolves a multi-part identifier such as "SCHEMA.EMP.EMPNO" to a namespace. The returned
* namespace, never null, may represent a schema, table, column, etc.
*/
public static SqlValidatorNamespace lookup(SqlValidatorScope scope, List<String> names) {
assert names.size() > 0;
final SqlValidatorScope.ResolvedImpl resolved = new SqlValidatorScope.ResolvedImpl();
scope.resolve(ImmutableList.of(names.get(0)), false, resolved);
assert resolved.count() == 1;
SqlValidatorNamespace namespace = resolved.only().namespace;
for (String name : Util.skip(names)) {
namespace = namespace.lookupChild(name);
assert namespace != null;
}
return namespace;
}
