hsyuan commented on a change in pull request #1959:
URL: https://github.com/apache/calcite/pull/1959#discussion_r422731546
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File path: core/src/main/java/org/apache/calcite/plan/RelTrait.java
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@@ -91,6 +93,17 @@
/**
* Applies a mapping to this trait.
*
+ * <p>Some traits may be changed if the columns order is changed by a
mapping of the
+ * {@link Project} operator. </p>
+ *
+ * <p>For example, if relation {@code ORDER a, b} is sorted by columns [0,
1], then the
Review comment:
Is it a typo? `ORDER a, b`
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