Kurt Deschler created IMPALA-9358:
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Summary: Query slowdown with inline views and hundreds of columns
Key: IMPALA-9358
URL: https://issues.apache.org/jira/browse/IMPALA-9358
Project: IMPALA
Issue Type: Bug
Components: Frontend
Affects Versions: Impala 3.2.0
Reporter: Kurt Deschler
IMPALA-8386 introduced an expensive precondition check using the function
ExprSubstitutionMap.checkComposedFrom(). This check has significant performance
impact on statements that contain inline views with hundreds of columns. This
check needs to be made more efficient to avoid exponential slowdowns with many
columns.
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