bug: resolve schema automactically in rw_table()

[st1page]

dev=> create schema s;
CREATE_SCHEMA
dev=> create table s.t(v int);
CREATE_TABLE
dev=> select * from rw_table(1001);
ERROR:  Failed to run the query

Caused by these errors (recent errors listed first):
  1: Catalog error
  2: table or source not found: t

[st1page]

Oh, it can work with schema name provided. hard to fix because we do not store the schema id in the table catalog and we need to maintain the backward compatibility if we want to add it in the proto. 😇