xuzifu666 commented on code in PR #4970:
URL: https://github.com/apache/calcite/pull/4970#discussion_r3315018605
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core/src/main/java/org/apache/calcite/rel/rules/FilterProjectTransposeRule.java:
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@@ -165,6 +165,13 @@ protected FilterProjectTransposeRule(
// it can be pushed down. For now we don't support this.
return;
}
+ // Pushing the filter below the project would split a single
+ // non-deterministic evaluation (e.g. RAND()) into two: one consumed by
+ // the new filter condition, and the original still produced by the
+ // project above. Refuse to transpose in that case.
+ if (!project.getProjects().stream().allMatch(RexUtil::isDeterministic)) {
Review Comment:
Blocks transpose (because RAND() exists in project)? eg:
```
SELECT * FROM (
SELECT RAND() as r, col1 as b FROM emp
)
WHERE col1 > 0
```
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