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https://issues.apache.org/jira/browse/CALCITE-3460?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-3460:
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Labels: pull-request-available (was: )
> Poor performance in RexReplacer for large queries
> -------------------------------------------------
>
> Key: CALCITE-3460
> URL: https://issues.apache.org/jira/browse/CALCITE-3460
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
> Labels: pull-request-available
>
> We have queries that have tens of thousands of RexCalls.
> reducibleExps.indexOf(call) is an O(n) operation, which takes 50% of the
> running time, causing the query runs for ever until timed out.
> In RexShuttle, ImmutableList iterator creation in {{visitList}} takes another
> 5~7% of running time, and it is creating millions of temporary iterator
> object, not only time consuming, but also memory consuming.
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