Cyril de Catheu created CALCITE-6466: ----------------------------------------
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 -- This message was sent by Atlassian Jira (v8.20.10#820010)