suez1224 commented on a change in pull request #6484: [FLINK-9134] [table] 
upgrade Calcite dependency to 1.17
URL: https://github.com/apache/flink/pull/6484#discussion_r207702177
 
 

 ##########
 File path: 
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/stream/sql/GroupWindowTest.scala
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 @@ -161,7 +161,7 @@ class GroupWindowTest extends TableTestBase {
             "rowtime('w$) AS w$rowtime",
             "proctime('w$) AS w$proctime")
         ),
-        term("select", "EXPR$0", "DATETIME_PLUS(w$end, 60000) AS EXPR$1")
+        term("select", "EXPR$0", "+(w$end, 60000) AS EXPR$1")
 
 Review comment:
   This is changed in https://issues.apache.org/jira/browse/CALCITE-2188. 
DATETIME_PLUS operator is not equal to PLUS operator, they just somehow share 
the same name "+" in plan after the PR. I can reach out to Calcite community to 
see if it makes sense to revert it back, I agree that using "DATETIME_PLUS" is 
more clear. 

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