jinxing64 commented on a change in pull request #1547: [CALCITE-3460] Poor
performance in RexReplacer for large queries
URL: https://github.com/apache/calcite/pull/1547#discussion_r340483666
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File path:
core/src/main/java/org/apache/calcite/rel/rules/ReduceExpressionsRule.java
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@@ -845,9 +846,12 @@ protected static RexNode substitute(RexCall call, int
ordinal, RexNode node) {
List<Boolean> addCasts) {
this.simplify = simplify;
this.unknownAs = unknownAs;
- this.reducibleExps = reducibleExps;
+ this.reducibleExpsMap = new HashMap<>();
this.reducedValues = reducedValues;
this.addCasts = addCasts;
+ for (int i = 0; i < reducibleExps.size(); i++) {
+ reducibleExpsMap.put(reducibleExps.get(i), i);
+ }
Review comment:
LGTM ~
shall we also save `reducedValues` by map ? Thus to save memory.
Please ignore if it gains little.
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