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fix(tianmu): backport support union different datetime type #1743 #1811

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May 24, 2023
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fix(tianmu): backport support union different datetime type #1743 #1811

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2 changes: 1 addition & 1 deletion mysql-test/suite/tianmu/r/delete_all_rows.result
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Expand Up @@ -83,7 +83,7 @@ sum(c_int)
# DELETE FROM TABLE_NAME for select/insert/Aggregate query
#
#
# DELETE FROM column_type_test spend too much time, optimize it later (#TODO)
# DELETE FROM column_type_test spend too much time, optimize it later
#
drop table column_type_test;
CREATE TABLE `column_type_test` (
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370 changes: 359 additions & 11 deletions mysql-test/suite/tianmu/r/issue880.result
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103 changes: 103 additions & 0 deletions mysql-test/suite/tianmu/r/union.result
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Expand Up @@ -471,4 +471,107 @@ a
78
910
DROP TABLE t1,t2;
CREATE TABLE t1 (a datetime);
INSERT INTO t1 VALUES ("2022-08-20 12:00:00"),("2022-08-21 12:00:00"),("2022-08-22 12:00:00"),("2022-08-23 12:00:00");
CREATE TABLE t2 (a timestamp);
INSERT INTO t2 VALUES ("2021-07-20 12:30:00"),("2021-07-21 12:30:00"),("2021-07-22 12:30:00"),("2021-07-23 12:30:00");
CREATE TABLE t3 (a date);
INSERT INTO t3 VALUES ("2020-06-10"),("2020-06-11"),("2020-06-12"),("2020-06-13");
SELECT a FROM t1 UNION SELECT a FROM t2;
a
2022-08-20 15:00:00
2022-08-21 15:00:00
2022-08-22 15:00:00
2022-08-23 15:00:00
2021-07-20 12:30:00
2021-07-21 12:30:00
2021-07-22 12:30:00
2021-07-23 12:30:00
SELECT a FROM t2 UNION SELECT a FROM t1;
a
2021-07-20 09:30:00
2021-07-21 09:30:00
2021-07-22 09:30:00
2021-07-23 09:30:00
2022-08-20 12:00:00
2022-08-21 12:00:00
2022-08-22 12:00:00
2022-08-23 12:00:00
SELECT a FROM t1 where a is null UNION SELECT a FROM t2;
a
2021-07-20 12:30:00
2021-07-21 12:30:00
2021-07-22 12:30:00
2021-07-23 12:30:00
SELECT a FROM t1 UNION SELECT a FROM t2 where a is null;
a
2022-08-20 15:00:00
2022-08-21 15:00:00
2022-08-22 15:00:00
2022-08-23 15:00:00
SELECT a FROM t1 UNION SELECT a FROM t3;
a
2022-08-20 12:00:00
2022-08-21 12:00:00
2022-08-22 12:00:00
2022-08-23 12:00:00
2020-06-10 00:00:00
2020-06-11 00:00:00
2020-06-12 00:00:00
2020-06-13 00:00:00
SELECT a FROM t3 UNION SELECT a FROM t1;
a
2020-06-10 00:00:00
2020-06-11 00:00:00
2020-06-12 00:00:00
2020-06-13 00:00:00
2022-08-20 12:00:00
2022-08-21 12:00:00
2022-08-22 12:00:00
2022-08-23 12:00:00
SELECT a FROM t1 where a is null UNION SELECT a FROM t3;
a
2020-06-10 00:00:00
2020-06-11 00:00:00
2020-06-12 00:00:00
2020-06-13 00:00:00
SELECT a FROM t1 UNION SELECT a FROM t3 where a is null;
a
2022-08-20 12:00:00
2022-08-21 12:00:00
2022-08-22 12:00:00
2022-08-23 12:00:00
SELECT a FROM t2 UNION SELECT a FROM t3;
a
2021-07-20 12:30:00
2021-07-21 12:30:00
2021-07-22 12:30:00
2021-07-23 12:30:00
2020-06-10 03:00:00
2020-06-11 03:00:00
2020-06-12 03:00:00
2020-06-13 03:00:00
SELECT a FROM t3 UNION SELECT a FROM t2;
a
2020-06-10 03:00:00
2020-06-11 03:00:00
2020-06-12 03:00:00
2020-06-13 03:00:00
2021-07-20 12:30:00
2021-07-21 12:30:00
2021-07-22 12:30:00
2021-07-23 12:30:00
SELECT a FROM t2 where a is null UNION SELECT a FROM t3;
a
2020-06-10 03:00:00
2020-06-11 03:00:00
2020-06-12 03:00:00
2020-06-13 03:00:00
SELECT a FROM t2 UNION SELECT a FROM t3 where a is null;
a
2021-07-20 12:30:00
2021-07-21 12:30:00
2021-07-22 12:30:00
2021-07-23 12:30:00
DROP TABLE t1,t2,t3;
DROP DATABASE union_test;
26,068 changes: 26,068 additions & 0 deletions mysql-test/suite/tianmu/std_data/issue880_t1.txt
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25,109 changes: 25,109 additions & 0 deletions mysql-test/suite/tianmu/std_data/issue880_t2.txt
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1,227 changes: 1,227 additions & 0 deletions mysql-test/suite/tianmu/std_data/issue880_t3.txt
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2 changes: 1 addition & 1 deletion mysql-test/suite/tianmu/t/delete_all_rows.test
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Expand Up @@ -53,7 +53,7 @@ select sum(c_int) from column_type_test;
--echo #

--echo #
--echo # DELETE FROM column_type_test spend too much time, optimize it later (#TODO)
--echo # DELETE FROM column_type_test spend too much time, optimize it later
--echo #

drop table column_type_test;
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1 change: 1 addition & 0 deletions mysql-test/suite/tianmu/t/issue880-master.opt
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@@ -0,0 +1 @@
--local-infile
194 changes: 185 additions & 9 deletions mysql-test/suite/tianmu/t/issue880.test
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Expand Up @@ -4,22 +4,198 @@
--echo # support (not timestamp union not timestamp)
--echo # support (timestamp union varchar)
--echo # support (varchar union timestamp)
--echo # not support (timestamp union datetime)
--echo # not support (datetime union timestamp)
--echo # support (timestamp union datetime)
--echo # support (datetime union timestamp)
--echo # not support (timestamp union other type)
--echo # not support (other type union timestamp)
--echo # SELECT timestamp_type/other_type FROM tablename union SELECT timestamp_type/other_type FROM tablename

--disable_warnings
DROP DATABASE IF EXISTS test_timestamp_union;
--enable_warnings

CREATE DATABASE test_timestamp_union;
USE test_timestamp_union;
create table t1(a datetime);
create table t2(b timestamp);
insert into t1 values('2020-12-23 00:00:00');
insert into t2 values('2022-04-18 00:00:00');
select * from t1 union select * from t2;

drop database test_timestamp_union;
CREATE TABLE `issue880_t1` (
`id` int NOT NULL COMMENT '主键; Size[MB]: 0.1; Ratio: 1.00',
`company_account_id` int DEFAULT NULL COMMENT 'tb_finance_company_account表主键; Size[MB]: 0.1; Ratio: 2.06',
`period_account_id` int DEFAULT NULL COMMENT '核账ID; Size[MB]: 0.1; Ratio: 1.78',
`COMPANY_ID` int DEFAULT NULL COMMENT '公司id; Size[MB]: 0.1; Ratio: 1.78',
`BALANCE` decimal(10,2) DEFAULT NULL COMMENT '变动的余额; Size[MB]: 0.1; Ratio: 2.78',
`before_balance` decimal(10,2) DEFAULT NULL COMMENT '变动前的余额; Size[MB]: 0.1; Ratio: 2.78',
`after_balance` decimal(10,2) DEFAULT NULL COMMENT '变动后的余额; Size[MB]: 0.1; Ratio: 2.78',
`create_time` timestamp NULL DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 2.39\0 ',
`update_time` datetime DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 2.39\0 ',
`type` smallint DEFAULT NULL COMMENT '交易类型（1线下核帐成功、2易宝代付成功,3易宝代付失败,4,每天抽佣,5每月抽佣,6每季度抽佣,7每年抽佣,8易宝手续费,9在线充值,10在线退款,11Saas产品购买,13补贴结算,14政府补贴到账,15运营商专项补贴 ,17余额冲正）; Size[MB]: 0.1; Ratio: 2.12',
`order_sn` varchar(100) DEFAULT NULL COMMENT '余额明细的订单编号; Size[MB]: 0.6; Ratio: 0.79',
`third_sn` varchar(45) DEFAULT NULL COMMENT '第三方流水号; Size[MB]: 0.1; Ratio: 0.00',
`commission_period` smallint DEFAULT NULL COMMENT '抽佣周期. T+1 1, 按月结算 2, 按季度结算 3, 按年结算 4; Size[MB]: 0.1; Ratio: 1.62',
`detail_period_time` varchar(45) DEFAULT NULL COMMENT ' T+1:(2018-10-12) , 按月结算:(1-12) , 按季度结算:(1,2,3,4), 按年结算(2018); Size[MB]: 0.1; Ratio: 0.00',
`period_pay_id` int DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 1.78\0 ',
`operator_time` datetime DEFAULT NULL COMMENT '操作时间; Size[MB]: 0.2; Ratio: 2.30',
`operator` varchar(50) DEFAULT NULL COMMENT '操作人; Size[MB]: 0.1; Ratio: 0.02',
`operator_id` int DEFAULT NULL COMMENT '操作人id; Size[MB]: 0.1; Ratio: 1.78',
`remark` varchar(50) DEFAULT NULL COMMENT '备注; Size[MB]: 0.1; Ratio: 0.02',
PRIMARY KEY (`id`),
UNIQUE KEY `company_account_change_id` (`id`),
KEY `company_change_company_id` (`COMPANY_ID`),
KEY `period_pay_id_index` (`period_pay_id`),
KEY `period_account_id_index` (`period_account_id`)
) ENGINE=TIANMU DEFAULT CHARSET=utf8 ROW_FORMAT=COMPRESSED;


CREATE TABLE `issue880_t2` (
`id` int NOT NULL COMMENT 'Size[MB]: 0.1; Ratio: 2.00\0 ',
`company_id` int DEFAULT NULL COMMENT '公司ID; Size[MB]: 0.1; Ratio: 2.06',
`company_name` varchar(250) DEFAULT NULL COMMENT '公司名称; Size[MB]: 0.5; Ratio: 0.77',
`product_id` int DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 1.77\0 ',
`product_name` varchar(60) DEFAULT NULL COMMENT 'Size[MB]: 0.4; Ratio: 0.72\0 ',
`pay_type` smallint NOT NULL DEFAULT '2' COMMENT '支付方式(1:支出，2:收入); Size[MB]: 0.1; Ratio: 2.00',
`pay_account` varchar(45) DEFAULT NULL COMMENT '支付账户; Size[MB]: 0.5; Ratio: 0.73',
`bank_code` varchar(10) DEFAULT NULL COMMENT '银行编号; Size[MB]: 0.2; Ratio: 0.39',
`poundage_mode` smallint DEFAULT NULL COMMENT '''手续费方式(运营商支付：1,平台支付:2)''; Size[MB]: 0.1; Ratio: 1.60',
`commission_period` smallint NOT NULL COMMENT '''抽佣周期. T+1 1, 按月结算 2, 按季度结算 3, 按年结算 4'',运营商专项补贴5，订阅结算6，每日结算抽佣7，每月结算抽佣8; Size[MB]: 0.1; Ratio: 2.00',
`create_time` timestamp NULL DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 2.30\0 ',
`update_time` timestamp NULL DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 2.39\0 ',
`maid_type` smallint DEFAULT NULL COMMENT '抽佣类型(1:平台抽佣，2：承担手续费); Size[MB]: 0.1; Ratio: 0.91',
`guarantee_amount` decimal(10,2) DEFAULT '0.00' COMMENT '保底金额; Size[MB]: 0.1; Ratio: 2.57',
`guarantee_extra_amount` decimal(10,4) DEFAULT '0.0000' COMMENT '额外支付金额; Size[MB]: 0.1; Ratio: 2.57',
`period_account_money` decimal(10,2) DEFAULT '0.00' COMMENT '分账结果; Size[MB]: 0.1; Ratio: 2.57',
`fee` decimal(10,2) DEFAULT NULL COMMENT '手续费; Size[MB]: 0.1; Ratio: 8.39',
`fee_type` varchar(10) DEFAULT NULL COMMENT '手续费类型; Size[MB]: 0.1; Ratio: 0.02',
`poundage_money` decimal(10,4) DEFAULT NULL COMMENT '手续费; Size[MB]: 0.1; Ratio: 2.57',
`sum_expense` decimal(10,2) DEFAULT NULL COMMENT '总金额; Size[MB]: 0.1; Ratio: 2.57',
`sum_electric_charge` decimal(10,3) DEFAULT NULL COMMENT '总电量; Size[MB]: 0.1; Ratio: 2.57',
`sum_service_charge` decimal(10,2) DEFAULT NULL COMMENT '总服务费; Size[MB]: 0.1; Ratio: 2.57',
`sum_earning_money` decimal(10,4) DEFAULT NULL COMMENT '总抽佣钱; Size[MB]: 0.1; Ratio: 2.57',
`begin_data_time` date DEFAULT NULL COMMENT '分账开始日期; Size[MB]: 0.1; Ratio: 1.22',
`end_data_time` date DEFAULT NULL COMMENT '分账结束日期; Size[MB]: 0.1; Ratio: 1.22',
`pay_status` smallint DEFAULT '0' COMMENT '支付状态(0:未支付，1:支付调用，2：支付成功,3:支付失败); Size[MB]: 0.1; Ratio: 1.06',
`fail_msg` varchar(250) DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 0.02\0 ',
`batch_no` varchar(30) DEFAULT NULL COMMENT '批次号; Size[MB]: 0.5; Ratio: 0.75',
`order_no` varchar(30) DEFAULT NULL COMMENT '订单号; Size[MB]: 0.6; Ratio: 0.79',
`period_operator` varchar(40) DEFAULT NULL COMMENT '核账确认用户; Size[MB]: 0.1; Ratio: 0.03',
`period_time` datetime DEFAULT NULL COMMENT '核账时间; Size[MB]: 0.1; Ratio: 2.30',
`period_status` smallint DEFAULT '0' COMMENT '线下核账状态，(0:未核账，1:已核账); Size[MB]: 0.1; Ratio: 1.60',
`out_sum_charge` decimal(10,3) DEFAULT '0.000' COMMENT '对外总电量; Size[MB]: 0.1; Ratio: 2.57',
`out_sum_earning_money` decimal(10,4) DEFAULT '0.0000' COMMENT '对外总抽佣; Size[MB]: 0.1; Ratio: 2.78',
`out_sum_money` decimal(10,4) DEFAULT '0.0000' COMMENT '对外总金额; Size[MB]: 0.1; Ratio: 2.78',
`in_sum_charge` decimal(10,3) DEFAULT '0.000' COMMENT '对内总电量; Size[MB]: 0.1; Ratio: 2.78',
`in_sum_earning_money` decimal(10,4) DEFAULT '0.0000' COMMENT '对内总抽佣; Size[MB]: 0.1; Ratio: 2.78',
`in_sum_money` decimal(10,4) DEFAULT '0.0000' COMMENT '对内总金额; Size[MB]: 0.1; Ratio: 2.78',
`period_pay_id` int DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 1.77\0 ',
`order_source` varchar(255) DEFAULT NULL COMMENT '订单来源，多个以逗号分隔; Size[MB]: 0.1; Ratio: 0.02',
`sum_subsidy_monetary` decimal(10,2) DEFAULT '0.00' COMMENT '总补贴金额; Size[MB]: 0.1; Ratio: 8.39',
`subscribe_number` varchar(5000) DEFAULT NULL COMMENT '订阅编号; Size[MB]: 0.1; Ratio: 0.04',
`settlement_status` smallint DEFAULT '1' COMMENT '是否需要结算0不需要，1需要; Size[MB]: 0.1; Ratio: 1.60',
`company_type` smallint DEFAULT '1' COMMENT '公司类型(1:运营商,2:合作伙伴); Size[MB]: 0.1; Ratio: 2.12',
PRIMARY KEY (`id`),
UNIQUE KEY `period_account_id` (`id`),
KEY `period_account_company_id` (`company_id`),
KEY `index_pay_type` (`pay_type`),
KEY `index_pay_status` (`pay_status`),
KEY `index_type_status` (`pay_type`,`pay_status`)
) ENGINE=TIANMU DEFAULT CHARSET=utf8 ROW_FORMAT=COMPRESSED;

CREATE TABLE `issue880_t3` (
`id` int NOT NULL COMMENT 'Size[MB]: 0.1; Ratio: 2.00\0 ',
`company_id` int DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 2.06\0 ',
`company_name` varchar(40) DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 0.20\0 ',
`poundage_mode` smallint DEFAULT NULL COMMENT '支付方式(1:支出，2:收入); Size[MB]: 0.1; Ratio: 2.12',
`money` decimal(10,2) DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 2.78\0 ',
`pay_status` smallint DEFAULT NULL COMMENT '支付状态(0:未支付，1:支付调用，2：支付成功,3:支付失败); Size[MB]: 0.1; Ratio: 2.12',
`fail_msg` varchar(250) DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 0.02\0 ',
`batch_no` varchar(30) DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 0.12\0 ',
`fee` decimal(10,2) DEFAULT NULL COMMENT '手续费; Size[MB]: 0.1; Ratio: 0.76',
`fee_type` varchar(10) DEFAULT NULL COMMENT '手续费类型; Size[MB]: 0.1; Ratio: 0.05',
`order_no` varchar(30) DEFAULT NULL COMMENT 'Size[MB]: 0.1; Ratio: 0.15\0 ',
`create_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'Size[MB]: 0.1; Ratio: 2.39\0 ',
`success_time` datetime DEFAULT NULL COMMENT '成功时间; Size[MB]: 0.1; Ratio: 1.30',
`source` smallint DEFAULT '0' COMMENT '代付订单来源：0抽佣结算，1政府补贴; Size[MB]: 0.1; Ratio: 0.24',
`period_account_id` int DEFAULT NULL COMMENT '分账ID; Size[MB]: 0.1; Ratio: 0.48',
`account_number` varchar(20) DEFAULT NULL COMMENT '交易银行账户; Size[MB]: 0.1; Ratio: 0.04',
`pay_flag` smallint DEFAULT '0' COMMENT '是否需要支付，0需要，1不需要; Size[MB]: 0.1; Ratio: 0.24',
`union_order_flag` smallint DEFAULT '0' COMMENT '是否合成订单0不是，1是; Size[MB]: 0.1; Ratio: 2.12',
PRIMARY KEY (`id`),
UNIQUE KEY `pay_id` (`id`),
UNIQUE KEY `pay_order_no` (`order_no`),
KEY `pay_status_index` (`pay_status`),
KEY `idx_pay_status_feetype` (`pay_status`,`fee_type`)
) ENGINE=TIANMU DEFAULT CHARSET=utf8 ROW_FORMAT=COMPRESSED;
--enable_warnings
# load data issue880_t1
LOAD DATA LOCAL INFILE 'suite/tianmu/std_data/issue880_t1.txt' INTO TABLE issue880_t1;

# load data issue880_t3
LOAD DATA LOCAL INFILE 'suite/tianmu/std_data/issue880_t3.txt' INTO TABLE issue880_t3;

# load data issue880_t2
LOAD DATA LOCAL INFILE 'suite/tianmu/std_data/issue880_t2.txt' INTO TABLE issue880_t2;

# test timestamp union timestamp
select b.create_time AS create_time
from (issue880_t3 a join issue880_t1 b)
where ((a.id = b.period_pay_id) and (a.pay_status = 2) and
(a.fee_type = 'TARGET') and (b.type = 2))
union
select a.create_time AS create_time
from (issue880_t2 a join issue880_t1 b)
where ((a.id = b.period_account_id) and (b.type = 1) and (a.pay_type = 1) and
(a.period_status = 1));

# test not timestamp union not timestamp
select b.update_time AS create_time
from (issue880_t3 a join issue880_t1 b)
where ((a.id = b.period_pay_id) and (a.pay_status = 2) and
(a.fee_type = 'TARGET') and (b.type = 2))
union
select a.period_time AS create_time
from (issue880_t2 a join issue880_t1 b)
where ((a.id = b.period_account_id) and (b.type = 1) and (a.pay_type = 1) and
(a.period_status = 1));

# test timestamp union datetime
select b.CREATE_TIME AS create_time
from (issue880_t3 a join issue880_t1 b)
where ((a.id = b.period_pay_id) and (a.pay_status = 2) and
(a.fee_type = 'TARGET') and (b.type = 2))
union
select a.period_time AS create_time
from (issue880_t2 a join issue880_t1 b)
where ((a.id = b.period_account_id) and (b.type = 1) and (a.pay_type = 1) and
(a.period_status = 1));

# test datetime union timestamp
select b.update_time AS create_time
from (issue880_t3 a join issue880_t1 b)
where ((a.id = b.period_pay_id) and (a.pay_status = 2) and
(a.fee_type = 'TARGET') and (b.type = 2))
union
select a.create_time AS create_time
from (issue880_t2 a join issue880_t1 b)
where ((a.id = b.period_account_id) and (b.type = 1) and (a.pay_type = 1) and
(a.period_status = 1));

# TODO: varchar union timestamp and timestamp union varchar
# select b.order_sn AS create_time
# from (issue880_t3 a join issue880_t1 b)
# where ((a.id = b.period_pay_id) and (a.pay_status = 2) and
# (a.fee_type = 'TARGET') and (b.type = 2))
# union
# select a.create_time AS create_time
# from (issue880_t2 a join issue880_t1 b)
# where ((a.id = b.period_account_id) and (b.type = 1) and (a.pay_type = 1) and
# (a.period_status = 1));
#
# select b.create_time AS create_time
# from (issue880_t3 a join issue880_t1 b)
# where ((a.id = b.period_pay_id) and (a.pay_status = 2) and
# (a.fee_type = 'TARGET') and (b.type = 2))
# union
# select a.product_name AS create_time
# from (issue880_t2 a join issue880_t1 b)
# where ((a.id = b.period_account_id) and (b.type = 1) and (a.pay_type = 1) and
# (a.period_status = 1));

# clean up
DROP DATABASE test_timestamp_union;
28 changes: 28 additions & 0 deletions mysql-test/suite/tianmu/t/union.test
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Expand Up @@ -145,4 +145,32 @@ INSERT INTO t2 VALUES ("12"),("34"),("56"),("78"),("910");
SELECT a FROM t1 UNION ALL SELECT a FROM t2;
DROP TABLE t1,t2;

CREATE TABLE t1 (a datetime);
INSERT INTO t1 VALUES ("2022-08-20 12:00:00"),("2022-08-21 12:00:00"),("2022-08-22 12:00:00"),("2022-08-23 12:00:00");
CREATE TABLE t2 (a timestamp);
INSERT INTO t2 VALUES ("2021-07-20 12:30:00"),("2021-07-21 12:30:00"),("2021-07-22 12:30:00"),("2021-07-23 12:30:00");
CREATE TABLE t3 (a date);
INSERT INTO t3 VALUES ("2020-06-10"),("2020-06-11"),("2020-06-12"),("2020-06-13");

# datetime union timestamp
SELECT a FROM t1 UNION SELECT a FROM t2;
SELECT a FROM t2 UNION SELECT a FROM t1;
SELECT a FROM t1 where a is null UNION SELECT a FROM t2;
SELECT a FROM t1 UNION SELECT a FROM t2 where a is null;


# datetime union date
SELECT a FROM t1 UNION SELECT a FROM t3;
SELECT a FROM t3 UNION SELECT a FROM t1;
SELECT a FROM t1 where a is null UNION SELECT a FROM t3;
SELECT a FROM t1 UNION SELECT a FROM t3 where a is null;

# timestamp union date
SELECT a FROM t2 UNION SELECT a FROM t3;
SELECT a FROM t3 UNION SELECT a FROM t2;
SELECT a FROM t2 where a is null UNION SELECT a FROM t3;
SELECT a FROM t2 UNION SELECT a FROM t3 where a is null;

DROP TABLE t1,t2,t3;

DROP DATABASE union_test;
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