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https://issues.apache.org/jira/browse/PHOENIX-777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14543912#comment-14543912
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James Taylor commented on PHOENIX-777:
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[~ram_krish] - that code can be tweaked as necessary. We just don't have a way
of *serializing* a null value. We do allow it to be null, though - for example,
if you have a KeyValue column that is absent, a value of a primitive type will
be null.
The bigger issue is the one that [~Dumindux] brings up with b/w compatibility.
I don't think that scheme is going to work, as we can't differentiate between a
value and the version byte. The only feasible way I can think to do it is:
- determine if we're the old format by dividing the number of bytes by the
sizeof a single value. If it doesn't divide without a remainder, we've got the
new format, otherwise we have the old format.
- pad (if necessary) the array such that it doesn't divide evenly.
- don't store null values for any single byte primitive value. I think this is
ok, as it doesn't make a whole lot of sense to have a TINYINT ARRAY in the
first place (it's essentially the same as BINARY).
> 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
>
> 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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