strongduanmu opened a new issue, #21417: URL: https://github.com/apache/shardingsphere/issues/21417
## Bug Report ### Which version of ShardingSphere did you use? https://github.com/apache/shardingsphere/commit/40b5076d63d21c0bb19cca16d4db211648b3c7f5 ### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy? ShardingSphere-Proxy ### Expected behavior Execute `SELECT * FROM t_order UNION ALL SELECT * FROM t_order;`, then get following result. ``` order_id | user_id | status | merchant_id | remark | creation_date ----------+---------+--------+-------------+--------+--------------- 1000 | 10 | init | 1 | test | 2017-08-08 1001 | 10 | init | 2 | test | 2017-08-08 2000 | 20 | init | 3 | test | 2017-08-08 2001 | 20 | init | 4 | test | 2017-08-08 1100 | 11 | init | 5 | test | 2017-08-08 1101 | 11 | init | 6 | test | 2017-08-08 2100 | 21 | init | 7 | test | 2017-08-08 2101 | 21 | init | 8 | test | 2017-08-08 1200 | 12 | init | 9 | test | 2017-08-08 1201 | 12 | init | 10 | test | 2017-08-08 2200 | 22 | init | 11 | test | 2017-08-08 2201 | 22 | init | 12 | test | 2017-08-08 1300 | 13 | init | 13 | test | 2017-08-08 1301 | 13 | init | 14 | test | 2017-08-08 2300 | 23 | init | 15 | test | 2017-08-08 2301 | 23 | init | 16 | test | 2017-08-08 1400 | 14 | init | 17 | test | 2017-08-08 1401 | 14 | init | 18 | test | 2017-08-08 2400 | 24 | init | 19 | test | 2017-08-08 2401 | 24 | init | 20 | test | 2017-08-08 1500 | 15 | init | 1 | test | 2017-08-08 1501 | 15 | init | 2 | test | 2017-08-08 2500 | 25 | init | 3 | test | 2017-08-08 2501 | 25 | init | 4 | test | 2017-08-08 1600 | 16 | init | 5 | test | 2017-08-08 1601 | 16 | init | 6 | test | 2017-08-08 2600 | 26 | init | 7 | test | 2017-08-08 2601 | 26 | init | 8 | test | 2017-08-08 1700 | 17 | init | 9 | test | 2017-08-08 1701 | 17 | init | 10 | test | 2017-08-08 2700 | 27 | init | 11 | test | 2017-08-08 2701 | 27 | init | 12 | test | 2017-08-08 1800 | 18 | init | 13 | test | 2017-08-08 1801 | 18 | init | 14 | test | 2017-08-08 2800 | 28 | init | 15 | test | 2017-08-08 2801 | 28 | init | 16 | test | 2017-08-08 1900 | 19 | init | 17 | test | 2017-08-08 1901 | 19 | init | 18 | test | 2017-08-08 2900 | 29 | init | 19 | test | 2017-08-08 2901 | 29 | init | 20 | test | 2017-08-08 1000 | 10 | init | 1 | test | 2017-08-08 1001 | 10 | init | 2 | test | 2017-08-08 2000 | 20 | init | 3 | test | 2017-08-08 2001 | 20 | init | 4 | test | 2017-08-08 1100 | 11 | init | 5 | test | 2017-08-08 1101 | 11 | init | 6 | test | 2017-08-08 2100 | 21 | init | 7 | test | 2017-08-08 2101 | 21 | init | 8 | test | 2017-08-08 1200 | 12 | init | 9 | test | 2017-08-08 1201 | 12 | init | 10 | test | 2017-08-08 2200 | 22 | init | 11 | test | 2017-08-08 2201 | 22 | init | 12 | test | 2017-08-08 1300 | 13 | init | 13 | test | 2017-08-08 1301 | 13 | init | 14 | test | 2017-08-08 2300 | 23 | init | 15 | test | 2017-08-08 2301 | 23 | init | 16 | test | 2017-08-08 1400 | 14 | init | 17 | test | 2017-08-08 1401 | 14 | init | 18 | test | 2017-08-08 2400 | 24 | init | 19 | test | 2017-08-08 2401 | 24 | init | 20 | test | 2017-08-08 1500 | 15 | init | 1 | test | 2017-08-08 1501 | 15 | init | 2 | test | 2017-08-08 2500 | 25 | init | 3 | test | 2017-08-08 2501 | 25 | init | 4 | test | 2017-08-08 1600 | 16 | init | 5 | test | 2017-08-08 1601 | 16 | init | 6 | test | 2017-08-08 2600 | 26 | init | 7 | test | 2017-08-08 2601 | 26 | init | 8 | test | 2017-08-08 1700 | 17 | init | 9 | test | 2017-08-08 1701 | 17 | init | 10 | test | 2017-08-08 2700 | 27 | init | 11 | test | 2017-08-08 2701 | 27 | init | 12 | test | 2017-08-08 1800 | 18 | init | 13 | test | 2017-08-08 1801 | 18 | init | 14 | test | 2017-08-08 2800 | 28 | init | 15 | test | 2017-08-08 2801 | 28 | init | 16 | test | 2017-08-08 1900 | 19 | init | 17 | test | 2017-08-08 1901 | 19 | init | 18 | test | 2017-08-08 2900 | 29 | init | 19 | test | 2017-08-08 2901 | 29 | init | 20 | test | 2017-08-08 (80 rows) ``` ### Actual behavior ``` order_id | user_id | status | merchant_id | remark | creation_date ----------+---------+--------+-------------+--------+--------------- 1000 | 10 | init | 1 | test | 2017-08-08 1001 | 10 | init | 2 | test | 2017-08-08 2000 | 20 | init | 3 | test | 2017-08-08 2001 | 20 | init | 4 | test | 2017-08-08 1100 | 11 | init | 5 | test | 2017-08-08 1101 | 11 | init | 6 | test | 2017-08-08 2100 | 21 | init | 7 | test | 2017-08-08 2101 | 21 | init | 8 | test | 2017-08-08 1200 | 12 | init | 9 | test | 2017-08-08 1201 | 12 | init | 10 | test | 2017-08-08 2200 | 22 | init | 11 | test | 2017-08-08 2201 | 22 | init | 12 | test | 2017-08-08 1300 | 13 | init | 13 | test | 2017-08-08 1301 | 13 | init | 14 | test | 2017-08-08 2300 | 23 | init | 15 | test | 2017-08-08 2301 | 23 | init | 16 | test | 2017-08-08 1400 | 14 | init | 17 | test | 2017-08-08 1401 | 14 | init | 18 | test | 2017-08-08 2400 | 24 | init | 19 | test | 2017-08-08 2401 | 24 | init | 20 | test | 2017-08-08 1500 | 15 | init | 1 | test | 2017-08-08 1501 | 15 | init | 2 | test | 2017-08-08 2500 | 25 | init | 3 | test | 2017-08-08 2501 | 25 | init | 4 | test | 2017-08-08 1600 | 16 | init | 5 | test | 2017-08-08 1601 | 16 | init | 6 | test | 2017-08-08 2600 | 26 | init | 7 | test | 2017-08-08 2601 | 26 | init | 8 | test | 2017-08-08 1700 | 17 | init | 9 | test | 2017-08-08 1701 | 17 | init | 10 | test | 2017-08-08 2700 | 27 | init | 11 | test | 2017-08-08 2701 | 27 | init | 12 | test | 2017-08-08 1800 | 18 | init | 13 | test | 2017-08-08 1801 | 18 | init | 14 | test | 2017-08-08 2800 | 28 | init | 15 | test | 2017-08-08 2801 | 28 | init | 16 | test | 2017-08-08 1900 | 19 | init | 17 | test | 2017-08-08 1901 | 19 | init | 18 | test | 2017-08-08 2900 | 29 | init | 19 | test | 2017-08-08 2901 | 29 | init | 20 | test | 2017-08-08 (40 rows) ``` ### Reason analyze (If you can) ### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc. ### Example codes for reproduce this issue (such as a github link). -- This is an automated message from the Apache Git Service. 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