Michael Smith created IMPALA-13307:
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Summary: disable_codegen_rows_threshold should apply to individual
fragments
Key: IMPALA-13307
URL: https://issues.apache.org/jira/browse/IMPALA-13307
Project: IMPALA
Issue Type: Improvement
Components: Backend
Reporter: Michael Smith
The {{disable_codegen_rows_threshold}} is currently applied query-wide. So if a
single scan deep in the query is expected to read a large number of rows, but
everything else expects to see hundreds of rows because the results will be
aggregated or heavily filtered, we still codegen the whole query.
{{disable_codegen_rows_threshold}} should be evaluated for each fragment so we
can determine whether to codegen based on the particular workload they'll be
handling.
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