Github user sudheeshkatkam commented on the pull request:
https://github.com/apache/drill/pull/159#issuecomment-142342234
We use "exec" as the first part of many option names (e.g.
```exec.min_hash_table_size```), and unfortunately, "exec" is a keyword, and
the parser throws an error (```... PARSE ERROR: Encountered "SET exec" ...```).
We still have to escape keywords.
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