wuchong commented on a change in pull request #11101:
[FLINK-16068][table-planner-blink] Fix computed column with escaped k…
URL: https://github.com/apache/flink/pull/11101#discussion_r380103215
##########
File path:
flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/calcite/SqlExprToRexConverter.java
##########
@@ -27,11 +27,15 @@
/**
* Converts a SQL expression to a {@link RexNode} expression.
+ *
+ * @param expr It's caller's duty to ensure that the expression has
been escaped correctly.
Review comment:
```
a SQL expression which must be quoted and expanded, e.g.
"`my_catalog`.`my_database`.`my_udf`(`f0`) + 1".
```
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