Github user xccui commented on a diff in the pull request:
https://github.com/apache/flink/pull/6027#discussion_r188895005
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarOperatorsTest.scala
---
@@ -406,5 +406,26 @@ class ScalarOperatorsTest extends
ScalarOperatorsTestBase {
"((((true) === true) || false).cast(STRING) + 'X ').trim",
"trueX")
testTableApi(12.isNull, "12.isNull", "false")
+
+ // between
+ testTableApi(2.between(1, 3), "2.BETWEEN(1, 3)", "true")
--- End diff --
Would be better to add some tests for boundaries here.
---
