Cyril de Catheu created CALCITE-6466:
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Summary: Sql Parsers instantiation is slow
Key: CALCITE-6466
URL: https://issues.apache.org/jira/browse/CALCITE-6466
Project: Calcite
Issue Type: Improvement
Reporter: Cyril de Catheu
*Summary: *
Sql Parsers instantiation is slow because it instantiates a Throwable with a
stacktrace.
The speed of instantiation also depends on the call stack depth at the time of
instantiation. The deeper in the call stack, the slower the instantiation.
*Analysis:*
This is an issue caused by JavaCC. The issue is fixed in newer version of
JavaCC.
Once JavaCC is upgraded to 7.0.13
(https://issues.apache.org/jira/browse/CALCITE-5541), this benchmark can be
re-run.
See full discussion here:
https://lists.apache.org/thread/xw35sdy1w1k8lvn1q1lr7xb93bkj0lpq
*TODO*:
Add a benchmark to measure the evolution of this issue.
The benchmark can be re-run once
https://issues.apache.org/jira/browse/CALCITE-5541 is done.
Expected improvements are:
- a minor speed improvement of ~10% for all parsers impacted by the issue
- the instantiation of parsers should not depend on the call stack depth anymore
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