Alexander Behm created IMPALA-6626:
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Summary: Failure to assign dictionary predicates should not result
in query failure
Key: IMPALA-6626
URL: https://issues.apache.org/jira/browse/IMPALA-6626
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Affects Versions: Impala 2.11.0, Impala 2.10.0, Impala 2.9.0
Reporter: Alexander Behm
Assigning dictionary predicates to Parquet scans may involve evaluation of
expressions in the BE which could fail for various reasons. Such failures
should lead to non-assignment of dictionary predicates but not to query failure.
See HdfsScanNode:
{code}
private void addDictionaryFilter(...) {
...
try {
if (analyzer.isTrueWithNullSlots(conjunct)) return;
} catch (InternalException e) { <--- does not handle Exception which will
cause query to fail
// Expr evaluation failed in the backend. Skip this conjunct since we
cannot
// determine whether it is safe to apply it against a dictionary.
LOG.warn("Skipping dictionary filter because backend evaluation failed: "
+ conjunct.toSql(), e);
return;
}
}
{code}
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