[Algebrizer/Rewriter] make OptimizeOption.remove_from_ default to true

[zhouqingqing]

This flag controls the behavior to remove redundant FROM (select * from (select * from a) b) after we fixed bugs with it, for example (aggregation from aggregation).

[pkommoju]

Removing remove_from is presenting problems when from contains union/intersect/except because outputs are not set for all except the first select.