danny0405 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_r311372569
##########
File path: core/src/main/java/org/apache/calcite/rel/core/Project.java
##########
@@ -282,7 +282,12 @@ public RelWriter explainTerms(RelWriter pw) {
if (!(exp.e instanceof RexInputRef)) {
return null;
}
- mapping.set(((RexInputRef) exp.e).getIndex(), exp.i);
+
+ int source = ((RexInputRef) exp.e).getIndex();
+ if (mapping.getTargetOpt(source) != -1) {
+ return null;
Review comment:
In a project, multiple source mapping to one target should never happen, i
think this is an necessary check.
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