liyafan82 commented on a change in pull request #2292:
URL: https://github.com/apache/calcite/pull/2292#discussion_r538099519
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File path: core/src/main/java/org/apache/calcite/plan/RelOptUtil.java
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@@ -850,6 +853,9 @@ public static RelNode createCastRel(
* instead, create a projection with the input of {@code rel} and the new
* cast expressions.
*
+ * <p>The field count of the desired row type and the row type to be
converted
+ * should be equal. Otherwise, it would throw an exception.
Review comment:
count -> counts
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