libenchao commented on code in PR #2911:
URL: https://github.com/apache/calcite/pull/2911#discussion_r974896291
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core/src/main/java/org/apache/calcite/sql2rel/RelFieldTrimmer.java:
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@@ -481,6 +481,18 @@ public TrimResult trimFields(
final int fieldCount = rowType.getFieldCount();
final RelNode input = project.getInput();
+ boolean containsSubQuery = false;
+ for (RexNode node : project.getProjects()) {
+ if (RexUtil.containsSubQuery(node)) {
+ containsSubQuery = true;
+ break;
+ }
+ }
+ // Do not trim Project's fields before SubQueryRemoveRule applies.
+ if (containsSubQuery) {
+ return result(project, Mappings.createIdentity(fieldCount));
+ }
+
Review Comment:
The test added in `sub-query.iq` will fail without this change. It surprised
me too that this does not affect any existing plan tests. I guess that's
because we don't have enough plan tests for sub query. If there is a test case
which is affected by this change, then it was already wrong.
Due to the integrity of this issue I think this is ok to keep it in the same
PR, WDYT?
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