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jackietien pushed a commit to branch GroupByBug
in repository https://gitbox.apache.org/repos/asf/iotdb.git

commit 0f7f2c97be29f903fe701b5618cd7f97623f43c9
Author: JackieTien97 <[email protected]>
AuthorDate: Fri May 21 16:19:20 2021 +0800

    add some comments
---
 .../java/org/apache/iotdb/db/integration/IoTDBGroupByUnseqIT.java   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git 
a/server/src/test/java/org/apache/iotdb/db/integration/IoTDBGroupByUnseqIT.java 
b/server/src/test/java/org/apache/iotdb/db/integration/IoTDBGroupByUnseqIT.java
index a00c27e..746b004 100644
--- 
a/server/src/test/java/org/apache/iotdb/db/integration/IoTDBGroupByUnseqIT.java
+++ 
b/server/src/test/java/org/apache/iotdb/db/integration/IoTDBGroupByUnseqIT.java
@@ -34,6 +34,12 @@ import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
+/**
+ * This test contains one seq file and one unseq file.
+ * In the seq file, it contains two pages: 1,2,3,4 in one page, 8,10,11,12 in 
another page.
+ * In the unseq file, it only contains one page: 7, 9.
+ * The unseq page is overlapped with the second seq page.
+ */
 public class IoTDBGroupByUnseqIT {
 
   private static String[] dataSet1 = new String[]{

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