vvysotskyi commented on a change in pull request #1945: DRILL-7502: Invalid
codegen for typeof() with UNION
URL: https://github.com/apache/drill/pull/1945#discussion_r363369497
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/DefaultSqlHandler.java
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@@ -324,7 +323,12 @@ protected DrillRel convertToDrel(RelNode relNode) throws
SqlUnsupportedException
/**
* A shuttle designed to finalize all RelNodes.
*/
- private static class PrelFinalizer extends RelShuttleImpl {
+ public static class PrelFinalizer extends RelShuttleImpl {
+
+ // The non-default constructor appears to be called from Calcite
+ // code when processing Hive-based queries.
+ public PrelFinalizer(DefaultSqlHandler handler) { }
Review comment:
Could you please explain it a little? I thought this is a regular visitor
which is used only in places where its instance is created and used. By the
way, since it doesn't store any state, its instance may be reused.
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