Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/210#issuecomment-60470554
Actually, this patch includes the module separation and package move. I
rearrange the packages of plan, optimizer, and expressions. In some viewpoint,
it may be not unnecessary.
But, the module separation inevitably causes conflicts against the patches
for plan, optimizer, and expression part. The package rename is very trivial
than the module separation. It just requires to rearrange package imports.
The reason why this patch includes the package rename is to cleanup the
package. The current package hierarchy of plan, optimizer, and expressions is
too ugly and inconsistent.
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