matriv commented on a change in pull request #17579:
URL: https://github.com/apache/flink/pull/17579#discussion_r738280594



##########
File path: 
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/functions/CastFunctionITCase.java
##########
@@ -966,4 +1130,21 @@ private static Instant fromLocalToUTC(LocalDateTime 
localDateTime) {
     private static Instant fromLocalTZ(String str) {
         return LocalDateTime.parse(str).toInstant(TEST_OFFSET);
     }
+
+    private static boolean randomBoolean() {

Review comment:
       I thought it's a not so important thing, since we test the cast from 
`BOOLEAN` type overall, but if you feel uneasy, I can do with default value as 
well for those.




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