xuyangzhong commented on code in PR #23519:
URL: https://github.com/apache/flink/pull/23519#discussion_r1372829433
##########
flink-table/flink-table-planner/src/main/java/org/apache/calcite/sql/fun/SqlRowOperator.java:
##########
@@ -66,12 +70,17 @@
* </ul>
* </ul>
*
- * Once Flink applies same logic for both table api and sql, this class should
be removed.
+ * <p>Once Flink applies same logic for both table api and sql, this first
changes should be
+ * removed.
+ *
+ * <p>2. It uses PEEK_FIELDS_NO_EXPAND with a nested struct type (Flink
[[RowType]]).
+ *
+ * <p>See more at {@code LogicalRelDataTypeConverter} and {@code
FlinkTypeFactory}.
Review Comment:
Agree with you.
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