leventov commented on a change in pull request #5958: Part 2 of changes for SQL
Compatible Null Handling
URL: https://github.com/apache/incubator-druid/pull/5958#discussion_r202522880
##########
File path: sql/src/main/java/io/druid/sql/calcite/rel/DruidSemiJoin.java
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@@ -308,16 +313,18 @@ public RelOptCost computeSelfCost(final RelOptPlanner
planner, final RelMetadata
for (int i = 0; i < values.size(); i++) {
final String value = values.get(i);
- subConditions.add(
- getCluster().getRexBuilder().makeCall(
- SqlStdOperatorTable.EQUALS,
- leftExpressions.get(i),
- getCluster().getRexBuilder().makeLiteral(value)
- )
- );
+ // NULLS are not supposed to match NULLs in a join. So ignore
them.
Review comment:
NULL*s*
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