Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/844#discussion_r123632779
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/DefaultSqlHandler.java
---
@@ -459,7 +468,13 @@ protected Prel convertToPrel(RelNode drel) throws
RelConversionException, SqlUns
/* The order of the following transformations is important */
/*
- * 0.) For select * from join query, we need insert project on top of
scan and a top project just
+ * 0.)
+ * Add top project before screen operator or writer to ensure that
final output column names are preserved.
+ */
+ phyRelNode = TopProjectVisitor.insertTopProject(phyRelNode,
validatedRowType);
--- End diff --
Make sense to me that you put this Visitor handling first, after physical
transform() call, before these existing visitor handling.
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