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https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15712591#comment-15712591
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ASF GitHub Bot commented on FLINK-4565:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/2870#discussion_r90499247
--- Diff:
flink-libraries/flink-table/src/test/java/org/apache/flink/api/java/batch/table/InITCase.java
---
@@ -0,0 +1,161 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.api.java.batch.table;
+
+import org.apache.flink.api.java.DataSet;
+import org.apache.flink.api.java.ExecutionEnvironment;
+import org.apache.flink.api.java.table.BatchTableEnvironment;
+import org.apache.flink.api.java.tuple.Tuple3;
+import org.apache.flink.api.scala.batch.utils.TableProgramsTestBase;
+import org.apache.flink.api.table.Row;
+import org.apache.flink.api.table.Table;
+import org.apache.flink.api.table.TableEnvironment;
+import org.apache.flink.api.table.ValidationException;
+import org.apache.flink.test.javaApiOperators.util.CollectionDataSets;
+import org.apache.flink.test.util.TestBaseUtils;
+import org.junit.Assert;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import java.util.List;
+
+@RunWith(Parameterized.class)
+public class InITCase extends TableProgramsTestBase {
--- End diff --
These `ITCases` are very expensive and significantly blow up the build
time.
We test expressions like `IN` using the `ExpressionTestBase`.
Please see `ScalarFunctionsTest` to check how it works and move all tests
to a test class that extends `ExpressionTestBase`. We would only need to check
for Scala and Java Table API because `IN`s in SQL queries are differently
executed.
> Support for SQL IN operator
> ---------------------------
>
> Key: FLINK-4565
> URL: https://issues.apache.org/jira/browse/FLINK-4565
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Nikolay Vasilishin
>
> It seems that Flink SQL supports the uncorrelated sub-query IN operator. But
> it should also be available in the Table API and tested.
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