Fixed a bug where all tests in IoTDBAggregationIT fail on a System with Locale...

Fixed a bug where all tests in IoTDBAggregationIT fail on a System with Locale different than English.

iotdb/src/test/java/org/apache/iotdb/db/integration/IoTDBAggregationIT.java

@@ -35,6 +35,8 @@ import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
+import java.util.Locale;
+
 import org.apache.iotdb.db.service.IoTDB;
 import org.apache.iotdb.db.utils.EnvironmentUtils;
 import org.apache.iotdb.jdbc.Config;
@@ -579,30 +581,30 @@ public class IoTDBAggregationIT {
       statement = connection.createStatement();
       // prepare BufferWrite file
       for (int i = 5000; i < 7000; i++) {
-        statement.execute(String.format(insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "true"));
+        statement.execute(String.format(Locale.ENGLISH, insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "true"));
       }
       statement.execute("flush");
       for (int i = 7500; i < 8500; i++) {
-        statement.execute(String.format(insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "false"));
+        statement.execute(String.format(Locale.ENGLISH, insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "false"));
       }
       statement.execute("flush");
       // prepare Unseq-File
       for (int i = 500; i < 1500; i++) {
-        statement.execute(String.format(insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "true"));
+        statement.execute(String.format(Locale.ENGLISH, insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "true"));
       }
       statement.execute("flush");
       for (int i = 3000; i < 6500; i++) {
-        statement.execute(String.format(insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "false"));
+        statement.execute(String.format(Locale.ENGLISH, insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "false"));
       }
 //      statement.execute("merge");
 
       // prepare BufferWrite cache
       for (int i = 9000; i < 10000; i++) {
-        statement.execute(String.format(insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "true"));
+        statement.execute(String.format(Locale.ENGLISH, insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "true"));
       }
       // prepare Overflow cache
       for (int i = 2000; i < 2500; i++) {
-        statement.execute(String.format(insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "false"));
+        statement.execute(String.format(Locale.ENGLISH, insertTemplate, i, i, i, (double) i, "\'" + i + "\'", "false"));
       }
       statement.close();