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Posted to commits@calcite.apache.org by GitBox <gi...@apache.org> on 2019/10/30 07:35:00 UTC

[GitHub] [calcite] hsyuan opened a new pull request #1547: [CALCITE-3460] Poor performance in RexReplacer for large queries

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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