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From Sergey Shelukhin <ser...@hortonworks.com>
Subject adding ANSI flag for hive
Date Thu, 12 Dec 2013 00:33:16 GMT
Hi.

There's recently been some discussion about data type changes in Hive
(double to decimal), and result changes for special cases like division by
zero, etc., to bring it in compliance with MySQL (that's what JIRAs use an
example; I am assuming ANSI SQL is meant).
The latter are non-controversial (I guess), but for the former, performance
may suffer and/or backward compat may be broken if Hive is brought in
compliance.
If fuller ANSI compat is sought in the future, there may be some even
hairier issues such as double-quoted identifiers.

In light of that, and also following MySQL, I wonder if we should add a
flag, or set of flags, to HIVE to be able to force ANSI compliance.
When this/ese flag/s is/are not set, for example, int/int division could
return double for backward compat/perf, vectorization can skip the special
case handling for division by zero/etc., etc.
Wdyt?

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