YesOrNo828 commented on code in PR #23684:
URL: https://github.com/apache/flink/pull/23684#discussion_r1404114371
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flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/runtime/stream/sql/FunctionITCase.java:
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@@ -1698,6 +1717,32 @@ public void eval(@DataTypeHint("STRING") StringData s) {
}
}
+ /** This is an empty synchronous table function. */
+ private static class LookupTableLevel0Function<T> extends TableFunction<T>
{}
+
+ /**
+ * Synchronous table function that uses {@link RowData} type inference for
{@link
+ * LookupTableSource} and inherits {@link TableFunction} at multiple
levels.
+ */
+ public static class LookupTableWithoutHintLevel1Function
Review Comment:
I have added the `testLookupTableFunctionWithHintLevel1` test.
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