caicancai commented on code in PR #3874:
URL: https://github.com/apache/calcite/pull/3874#discussion_r1685341278
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core/src/main/java/org/apache/calcite/rel/rules/SortJoinCopyRule.java:
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@@ -96,9 +96,7 @@ public SortJoinCopyRule(Class<? extends Sort> sortClass,
if (leftFieldCollation.isEmpty()) {
newLeftInput = join.getLeft();
} else {
- final RelCollation leftCollation =
- RelCollationTraitDef.INSTANCE.canonize(
- RelCollations.of(leftFieldCollation));
+ final RelCollation leftCollation = RelCollations.of(leftFieldCollation);
Review Comment:
One question, why did you change it? I observed that you only changed the
shift interface, and the shift interface was not called here.
Is it because this part of the code is redundant?
I observed that the return value of the of interface is return
RelCollationTraitDef.INSTANCE.canonize(collation), and it seems that this part
of the code is indeed redundant
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