Haisheng Yuan created CALCITE-3460:
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Summary: 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
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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