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https://issues.apache.org/jira/browse/PHOENIX-4644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389001#comment-16389001
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James Taylor commented on PHOENIX-4644:
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If first arg is null, then expression evaluates to null, but a null second arg
returns first arg. FYI, the index argument is zero based.
> Array modification functions should require two arguments
> ---------------------------------------------------------
>
> Key: PHOENIX-4644
> URL: https://issues.apache.org/jira/browse/PHOENIX-4644
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Assignee: James Taylor
> Priority: Major
> Fix For: 4.14.0
>
> Attachments: PHOENIX-4644_v1.patch
>
>
> ARRAY_APPEND, ARRAY_PREPEND, and ARRAY_CAT should require two arguments.
> Also, if the second argument is null, we need to make sure not to have the
> entire expression return null (but instead it should return the first
> argument). To accomplish this, we need to have a ParseNode that overrides the
> method controlling this and ensure it's used for these functions.
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