jaehong choi 2e0f253c32 introducing lists of existing columns in the fields of select queries' output (#2491)
* introducing lists of existing columns in the fields of select queries' output

* rebase master

* address the comment. add test code for select query caching

* change the cache code in SelectQueryQueryToolChest to 0x16
2016-08-25 21:37:53 +05:30
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