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https://issues.apache.org/jira/browse/CALCITE-1012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15049354#comment-15049354
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Julian Hyde commented on CALCITE-1012:
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For better or worse, that's the API we use. The first time it will populate the
static SqlParserImpl.metadata field, and it recursively invokes a parser to do
so. I wouldn't count that in benchmarks. Every time you create a parser it will
populate
{code}JJCalls[] jj_2_rtns = new JJCalls[721]{code}
and initialize each with a JJCall - a struct with 4 members. That probably
accounts for your 70KB.
We could look at re-using parser instances, saving a small number of them in a
cache. Can you change your benchmark to call one of the SqlParserImpl.ReInit
methods?
> Benchmark SQL parser
> --------------------
>
> Key: CALCITE-1012
> URL: https://issues.apache.org/jira/browse/CALCITE-1012
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
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