xiedeyantu commented on code in PR #4970:
URL: https://github.com/apache/calcite/pull/4970#discussion_r3361851737
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core/src/main/java/org/apache/calcite/plan/RelOptUtil.java:
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@@ -3346,6 +3346,21 @@ public static List<RexNode> pushPastProject(List<?
extends RexNode> nodes,
// function? Possibly. But it's invalid SQL, so don't go there.
return null;
}
+ // [CALCITE-7551] Refuse to merge if it would duplicate a
+ // non-deterministic expression (e.g. RAND()).
+ final List<RexNode> bottom = project.getProjects();
+ final int[] refs = new int[bottom.size()];
+ new RexVisitorImpl<Void>(true) {
+ @Override public Void visitInputRef(RexInputRef ref) {
+ refs[ref.getIndex()]++;
+ return null;
+ }
+ }.visitEach(nodes);
+ for (int i = 0; i < refs.length; i++) {
Review Comment:
After thinking about it carefully, I believe we should create this JIRA
before this PR is merged. However, it shouldn't block the PR from being merged,
since the stricter approach does not introduce any incorrect behavior. Am I
right?
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