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https://issues.apache.org/jira/browse/IMPALA-8405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kris Hahn reassigned IMPALA-8405:
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Assignee: (was: Kris Hahn)
> Document UDA state machine
> --------------------------
>
> Key: IMPALA-8405
> URL: https://issues.apache.org/jira/browse/IMPALA-8405
> Project: IMPALA
> Issue Type: Bug
> Components: Docs
> Reporter: Tim Armstrong
> Priority: Major
> Labels: impala_user_docs_open
> Attachments: screenshot-1.png, udaf_state_machine.png
>
>
> The documentation in "The Underlying Functions for a UDA" doesn't do a good
> job of explaining the state transitions that a UDA can go through. E.g. when
> is Serialize() called. It's complicated because data needs to be serialized
> to go over the network, but *sometimes* is serialized to spill to disk, which
> changes the sequence of function calls.
> See
> https://community.cloudera.com/t5/Interactive-Short-cycle-SQL/Function-execution-flow-in-UDAs-and-memory-implications-for/m-p/88892#M5532?eid=1&aid=1
> for a user who is trying to understand this.
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