Wei Huang created HIVE-11619:
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Summary: For GenericUDAFs, iterate function is called despite
empty table
Key: HIVE-11619
URL: https://issues.apache.org/jira/browse/HIVE-11619
Project: Hive
Issue Type: Bug
Components: API, Hive
Environment: HDP 2.3
Reporter: Wei Huang
For empty input tables, the iterate function in GenericUDAF is called once with
a null input for empty table. This makes it impossible to differentiate the
empty table case for the case where there the table has one row with a null in
the desired column.
This happens only when the genericUDAFcall is made with a column name specified
and not when the '*' wild card in used.
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