hsyuan commented on a change in pull request #1985:
URL: https://github.com/apache/calcite/pull/1985#discussion_r431867202
##########
File path:
core/src/main/java/org/apache/calcite/adapter/enumerable/EnumerableProject.java
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@@ -86,4 +100,74 @@ public Result implement(EnumerableRelImplementor
implementor, Prefer pref) {
// EnumerableCalcRel is always better
throw new UnsupportedOperationException();
}
+
+ @Override public Pair<RelTraitSet, List<RelTraitSet>> passThroughTraits(
+ RelTraitSet required) {
+ RelCollation collation = required.getCollation();
+ if (collation == null) {
+ return null;
+ }
+
+ final Mappings.TargetMapping map =
+ RelOptUtil.permutationIgnoreCast(
+ getProjects(), getInput().getRowType());
+
+ for (RelFieldCollation rc : collation.getFieldCollations()) {
+ if (!isCollationOnTrivialExpr(map, rc)) {
+ return null;
+ }
+ }
+
+ final RelCollation newCollation = collation.apply(map);
+ return Pair.of(required, ImmutableList.of(required.replace(newCollation)));
+ }
+
+ @Override public Pair<RelTraitSet, List<RelTraitSet>> deriveTraits(
+ final RelTraitSet childTraits, final int childId) {
+ RelCollation collation = childTraits.getCollation();
+ if (collation == null) {
+ return null;
+ }
+
+ final Mappings.TargetMapping map =
+ RelOptUtil.permutationIgnoreCast(
+ getProjects(), getInput().getRowType());
Review comment:
There is. You can use `Project.getPartialMapping()` instead.
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