[CBRD-24880] semantic check for remote table column names and aliases

[beyondykk9]

http://jira.cubrid.org/browse/CBRD-24880

It needs to check semantic for rewriting correctly the query with predicate pushing.

The dblink query can be rewritten by pushing predicates to enhance the performance. The query is rewritten by wrapping the user's query with "SELECT * FROM". While the rewriting processing it needs check the column names and aliases wether they are the same as DBLINK column definition's one.

For example, the following query is rewritten and the rewritten query returns error from the ORACLE server.

SELECT t.a, t.c FROM DBLINK(srv1, 'SELECT a, b AS p FROM t1 WHERE a > 10') t(a, c) JOIN tbl ON t.a = tbl.a WHERE c > 'a';
==> rewritten query to be executed at remote server (ORACLE or otheer DBMS)
SELECT * FROM (SELECT a, b AS p FROM t1 WHERE a > 10) cublink (a, c) WHERE c > 'a'
The query should be rewritten as below:

SELECT * FROM (SELECT a, b AS p FROM t1 WHERE a > 10) cublink WHERE p > 10