amaliujia commented on a change in pull request #2011:
URL: https://github.com/apache/calcite/pull/2011#discussion_r437586908
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File path: core/src/main/java/org/apache/calcite/plan/RelOptUtil.java
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@@ -3766,6 +3771,115 @@ private static void fix(List<RexNode> operands, int
before, int after) {
}
}
+ /**
+ * Gets a shuttle to expand RexLocalRef.
+ */
+ public static RexShuttle getExpandShuttle(RexProgram rexProgram) {
+ return new RexShuttle() {
+ @Override public RexNode visitLocalRef(RexLocalRef localRef) {
+ return rexProgram.expandLocalRef(localRef);
+ }
+ };
+ }
+
+ /**
+ * Determine whether there is mapping between project input and output
fields.
+ * Bail out if sort relies on non-trivial expressions.
+ */
+ private static boolean isCollationOnTrivialExpr(
+ List<RexNode> projects,RelDataTypeFactory typeFactory,
+ Mappings.TargetMapping map, RelFieldCollation fc, boolean passDown) {
+ final int index = fc.getFieldIndex();
+ int target = map.getTargetOpt(index);
Review comment:
I think the part of construct pairs of traits for `passThroughTraits`
and `dervieTratis` are better kept in Enumerable nodes, at least for better
readbility.
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