Sergey Shelukhin created HIVE-14893:
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Summary: vectorized execution may convert LongCV to smaller types
incorrectly
Key: HIVE-14893
URL: https://issues.apache.org/jira/browse/HIVE-14893
Project: Hive
Issue Type: Bug
Reporter: Sergey Shelukhin
See the results for vectorized in decimal_11 test added in HIVE-14863.
We cast decimal to various int types; the cast is specialized for each type on
non-vectorized side; on vectorized side, it's only specialized for
LongColumnVector. LongColumnVector gets converted to a proper type in some
other mysterious place later, and tiny/small/regular int become truncated.
Logically, I am not sure if every vectorized expression should be aware of the
underlying type for the LongColumnVector (that seems implausible - I am not
sure if type information is even available, and if yes it doesn't look like
it's used in other places), or if they long-to-smaller-type automatic
conversion should be fixed to produce nulls on overflow.
However it seems like a good idea to do the latter in any case, to have a
catch-all for all the vectorized expressions that might treat LongCV as
representing longs at all times.
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