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From "Matt McCline (JIRA)" <>
Subject [jira] [Updated] (HIVE-18622) Vectorization: IF Statements, Comparisons, and more do not handle NULLs correctly
Date Fri, 16 Feb 2018 15:48:00 GMT


Matt McCline updated HIVE-18622:
    Attachment: HIVE-18622.0994.patch

> Vectorization: IF Statements, Comparisons, and more do not handle NULLs correctly
> ---------------------------------------------------------------------------------
>                 Key: HIVE-18622
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>             Fix For: 3.0.0
>         Attachments: HIVE-18622.03.patch, HIVE-18622.04.patch, HIVE-18622.05.patch, HIVE-18622.06.patch,
HIVE-18622.07.patch, HIVE-18622.08.patch, HIVE-18622.09.patch, HIVE-18622.091.patch, HIVE-18622.092.patch,
HIVE-18622.093.patch, HIVE-18622.094.patch, HIVE-18622.095.patch, HIVE-18622.096.patch, HIVE-18622.097.patch,
HIVE-18622.098.patch, HIVE-18622.099.patch, HIVE-18622.0992.patch, HIVE-18622.0993.patch,
>  Many vector expression classes are setting noNulls to true which does not work if the
VRB is a scratch column being reused. The previous use may have set noNulls to false and the
isNull array will have some rows marked as NULL. The result is wrong query results and sometimes
NPEs (for BytesColumnVector).
> So, many vector expressions need this:
> {code:java}
>       // Carefully handle NULLs...
>       /*
>        * For better performance on LONG/DOUBLE we don't want the conditional
>        * statements inside the for loop.
>        */
>       outputColVector.noNulls = false;
>  {code}
> And, vector expressions need to make sure the isNull array entry is set when outputColVector.noNulls
is false.
> And, all place that assign column value need to set noNulls to false when the value is
> Almost all cases where noNulls is set to true are incorrect.

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