Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/74#issuecomment-49152988
I removed existIndexByColumn() and getIndexByColumn() from catalog
interface, because indexes can be created not only for columns but also
expressions.
Instead, we need to support an alternative way to find a proper index for
given columns, later.
PostgreSQL also doesn't seem to support the above functions directly. (see
http://stackoverflow.com/questions/2204058/show-which-columns-an-index-is-on-in-postgresql.)
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