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https://issues.apache.org/jira/browse/PHOENIX-777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14559426#comment-14559426
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James Taylor commented on PHOENIX-777:
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I don't think that disambiguates those values from null. I think the idea I
floated does, but has some limitations. Another way (possible now) is for
an application to reserve a value to mean "null".
> Support null value for fixed length ARRAY
> -----------------------------------------
>
> Key: PHOENIX-777
> URL: https://issues.apache.org/jira/browse/PHOENIX-777
> Project: Phoenix
> Issue Type: Task
> Reporter: James Taylor
> Assignee: Dumindu Buddhika
> Fix For: 4.4.0
>
>
> A null value for a fixed length array can be handled with a bitset tacked on
> the end of the array. If an element is set to null, then the bit at that
> index is set. Trailing nulls are not stored and an attempt to access an array
> past the current size returns null.
> Current behavior,
> PBinaryArray - Throws an exception when a null is inserted.
> PBooleanArray - null is considered as false when a null is inserted.
> PCharArray - Throws an exception when a null is inserted.
> PDateArray - Throws an exception when a null is inserted.
> PDoubleArray - null is considered as 0.0 when a null is inserted.
> PFloatArray - null is considered as 0.0 when a null is inserted.
> PIntegerArray - null is considered as 0 when a null is inserted.
> PLongArray - null is considered as 0 when a null is inserted.
> PSmallIntArray - null is considered as 0 when a null is inserted.
> PTimeArray - Throws an exception when a null is inserted.
> PTimeStampArray - Throws an exception when a null is inserted.
> PTinyIntArray - null is considered as 0 when a null is inserted.
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