hsyuan opened a new pull request #1547: [CALCITE-3460] Poor performance in RexReplacer for large queries URL: https://github.com/apache/calcite/pull/1547 We have queries that have tens of thousands of RexCalls. reducibleExps.indexOf(call) is an (O) 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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