Csaba Ringhofer created IMPALA-12111:
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Summary: Speed up DATE to STRING conversion
Key: IMPALA-12111
URL: https://issues.apache.org/jira/browse/IMPALA-12111
Project: IMPALA
Issue Type: Improvement
Components: be
Reporter: Csaba Ringhofer
Converting DATE to STRING is slower than converting TIMESTAMP to STRING which
is weird as TIMESTAMP handling should need more work. The culprit seems to be
using stringstream in DateValue.ToString():
https://github.com/apache/impala/blob/14698c8b99b80db7e6fd99900e32b6742bef1662/be/src/runtime/date-value.cc#L433
As dates are returned as string to the client this also slow down the
materialization of results on the coordinator.
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