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https://issues.apache.org/jira/browse/IMPALA-13552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18048532#comment-18048532
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Arnab Karmakar commented on IMPALA-13552:
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1. As per the feedback from [~xuebinsu] and [~csringhofer], this patch will add
*TYPE_ARRAY* and *TYPE_MAP* enum members to the *FunctionContext::Type* enum in
the public UDF API.
2. These enum values are appended at the end to maintain ABI compatibility with
existing compiled UDFs.
3. Future work IMPALA-9519 will expose safe public API for user UDFs
(*CollectionVal* have to be made public)
> size()/length() function for array/map types
> --------------------------------------------
>
> Key: IMPALA-13552
> URL: https://issues.apache.org/jira/browse/IMPALA-13552
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend, Frontend
> Reporter: Quanlong Huang
> Assignee: Arnab Karmakar
> Priority: Critical
>
> Hive has a size() function to calculate the length of array/map values. We
> need a similar one to collect stats of array/map columns. length() can be
> defined as an alias to this.
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