Fix table drop in tests
Add one more test
Initial subqueries support API
Minor fixes
Prefix should be static to be shareble with subqueries
Added nicer where API to define operators
Revert "Minor fixes"

This reverts commit 99909967cb1d952c9633e83d489c5c645d85e5df.
Subquery support in UPDATE/INSERT
Merge pull request #3 from avbdr/master

Merge from avbdr