chunweilei commented on a change in pull request #1355: [CALCITE-3228] Error
while applying rule ProjectScanRule: interpreter
URL: https://github.com/apache/calcite/pull/1355#discussion_r310630268
##########
File path: core/src/main/java/org/apache/calcite/rel/core/Project.java
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@@ -282,7 +282,12 @@ public RelWriter explainTerms(RelWriter pw) {
if (!(exp.e instanceof RexInputRef)) {
return null;
}
Review comment:
I don't think it is safe to call `TargetMapping#getTarget(int)` mentioned in
the comment.
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