korlov42 commented on a change in pull request #2623:
URL: https://github.com/apache/calcite/pull/2623#discussion_r827154071
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File path: druid/src/main/java/org/apache/calcite/adapter/druid/DruidRules.java
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@@ -395,10 +396,11 @@ protected DruidProjectRule(DruidProjectRuleConfig config)
{
}
builder.add(name, e.getType());
}
- final RelNode newProject = project.copy(project.getTraitSet(), input,
below, builder.build());
+ final RelNode newProject = project.copy(project.getTraitSet(), input,
below, builder.build(),
+ ImmutableSet.of());
Review comment:
This rule actually splits the original project onto two. The project
below (named `newProject` here) is an identity project that trim unused fields.
Hence, it's safe to pass an empty set in that case.
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