deniskuzZ commented on code in PR #5262:
URL: https://github.com/apache/hive/pull/5262#discussion_r1683432966
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ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveAggregateReduceFunctionsRule.java:
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@@ -517,6 +517,12 @@ private RexNode reduceStddev(
rexBuilder.makeCall(
SqlStdOperatorTable.MINUS,
sumArgSquared, avgSumSquaredArg);
+ final RexNode zeroLiteral =
+ rexBuilder.makeExactLiteral(BigDecimal.ZERO);
+ final RexNode correctedDiff = rexBuilder.makeCall(SqlStdOperatorTable.CASE,
+ rexBuilder.makeCall(SqlStdOperatorTable.LESS_THAN, diff,
zeroLiteral),
Review Comment:
@yangjiandan, should we check that it's not just less than zero, but within
defined epsilon?
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