libenchao commented on code in PR #3085:
URL: https://github.com/apache/calcite/pull/3085#discussion_r1181247359
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core/src/main/java/org/apache/calcite/rel/rel2sql/SqlImplementor.java:
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@@ -1791,6 +1791,14 @@ private boolean needNewSubQuery(
return false;
}
final Clause maxClause = Collections.max(clauses);
+
+ if (rel instanceof Project
+ && clauses.contains(Clause.ORDER_BY)
+ && dialect.getConformance().isSortByOrdinal()) {
+ // Cannot merge a Project that contains sort by ordinal under it.
+ return hasSortByOrdinal();
Review Comment:
To be honest, I felt uneasy about moving this up. I'm not sure if we will
miss some opportunity to add a new sub query. The changes in
https://github.com/apache/calcite/pull/3057 was also merged by me, and now I
think that is not perfect as well, since it also suffers from this.
For `needNewSubQuery`, we should only bail out when we returns `true`. In
that way, we could safely add new conditions into this method, and all the
cases are orthogonal.
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