查询External catalog（postgresql）中的表，where条件没有携带到oracle中去导致查询缓慢

[superstar100]

Steps to reproduce the behavior (Required)

1. CREATE TABLE '...'
2. INSERT INTO '....'
3. SELECT '....'

Expected behavior (Required)

Real behavior (Required)

StarRocks version (Required)

• You can get the StarRocks version by executing SQL select current_version()