raminqaf commented on code in PR #27898:
URL: https://github.com/apache/flink/pull/27898#discussion_r3043959721
##########
flink-table/flink-table-planner/src/test/scala/org/apache/flink/table/planner/expressions/ScalarFunctionsTest.scala:
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@@ -429,6 +446,13 @@ class ScalarFunctionsTest extends ScalarTypesTestBase {
@Test
def testLikeWithEscape(): Unit = {
+ // empty ESCAPE string: no escape character, _ and % retain wildcard
semantics
+ testAllApis("abc".like("abc", ""), "'abc' LIKE 'abc' ESCAPE ''", "TRUE")
+ testAllApis("abd".like("abc", ""), "'abd' LIKE 'abc' ESCAPE ''", "FALSE")
+ testAllApis("abcdef".like("abc%", ""), "'abcdef' LIKE 'abc%' ESCAPE ''",
"TRUE")
+ testAllApis("abcdef".like("%def", ""), "'abcdef' LIKE '%def' ESCAPE ''",
"TRUE")
+ testAllApis("abcdef".like("%cd%", ""), "'abcdef' LIKE '%cd%' ESCAPE ''",
"TRUE")
Review Comment:
Can we add a test for this case please
```sql
'abc_def' LIKE 'abc_def' ESCAPE ''
```
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