himanshug commented on a change in pull request #7716: AggregatorUtil should
cache parsed expression to avoid memory problem (OOM/FGC) when Expression is
used in metricsSpec
URL: https://github.com/apache/incubator-druid/pull/7716#discussion_r287079210
##########
File path:
processing/src/main/java/org/apache/druid/query/aggregation/AggregatorUtil.java
##########
@@ -196,7 +246,7 @@ static BaseFloatColumnValueSelector
makeColumnValueSelectorWithFloatDefault(
if (fieldName != null) {
return metricFactory.makeColumnValueSelector(fieldName);
} else {
- final Expr expr = Parser.parse(fieldExpression, macroTable);
+ final Expr expr = parseIfAbsent(fieldExpression, macroTable);
Review comment:
sent a PR to your branch, pls merge that. I meant to remove cache altogether
and tie lifetime of parsed expression to the object holding it.
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