Tim Armstrong created IMPALA-8405:
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Summary: Document UDA state machine
Key: IMPALA-8405
URL: https://issues.apache.org/jira/browse/IMPALA-8405
Project: IMPALA
Issue Type: Improvement
Components: Docs
Reporter: Tim Armstrong
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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