Github user vasia commented on a diff in the pull request:
https://github.com/apache/flink/pull/1738#discussion_r54430318
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/table.scala
---
@@ -98,7 +100,19 @@ class Table(
.map(toRexNode(_, relBuilder))
relBuilder.project(exprs.toIterable.asJava)
- new Table(relBuilder.build(), relBuilder)
+ var projected = relBuilder.build()
+
+ if(relNode == projected) {
+ // Calcite's RelBuilder does not translate identity projects even if
they rename fields.
+ // Add a projection ourselves (will be automatically removed by
translation rules).
+ val names = exprs.map(_.asInstanceOf[RexCall].getOperands.get(1)
--- End diff --
This cast to `RexCall` seems to cause several tests to fail.
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