1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where; FirstMatch(<subquery4>); Using join buffer (flat, BNL join)
4 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 100.00
2 DERIVED t1 system NULL NULL NULL NULL 1 100.00
Warnings:
Note 1276 Field or reference 'sq.f2' of SELECT #3 was resolved in SELECT #1
Note 1003 select 6 AS `f1` from <materialize> (select `test`.`t2`.`f3` from `test`.`t2` having (`test`.`t2`.`f3` >= 8)) semi join (`test`.`t2`) where ((`test`.`t2`.`f3` = 6) and (9 = `<subquery4>`.`f3`))
DROP TABLE t2,t1;
#
# MDEV-9462: Out of memory using explain on 2 empty tables
#
CREATE TABLE `t1` (
`REC_GROUP` char(2) DEFAULT NULL,
`CLIENT_INFO` text CHARACTER SET utf8,
`NAME` text,
`PHONE_NUMBER` text,
`ATTENTION_NAME` text,
`PAYMENT_TERM` text CHARACTER SET utf8,
`CREDIT_LIMIT` decimal(12,2) DEFAULT NULL,
`LAST_PAY_DATE` text CHARACTER SET utf8,
`TOTAL` double DEFAULT NULL,
`TOTAL_MCL` double DEFAULT NULL,
`TOTAL_MFS` double DEFAULT NULL,
`TOTAL_MIS` double DEFAULT NULL,
`BEFORE_DUE_7_MCL` double DEFAULT NULL,
`BEFORE_DUE_7_MFS` double DEFAULT NULL,
`BEFORE_DUE_7_MIS` double DEFAULT NULL,
`PER1_MCL` double DEFAULT NULL,
`PER1_MFS` double DEFAULT NULL,
`PER1_MIS` double DEFAULT NULL,
`PER2_MCL` double DEFAULT NULL,
`PER2_MFS` double DEFAULT NULL,
`PER2_MIS` double DEFAULT NULL,
`PER3_MCL` double DEFAULT NULL,
`PER3_MFS` double DEFAULT NULL,
`PER3_MIS` double DEFAULT NULL,
`PER4_MCL` double DEFAULT NULL,
`PER4_MFS` double DEFAULT NULL,
`PER4_MIS` double DEFAULT NULL,
`PER5_MCL` double DEFAULT NULL,
`PER5_MFS` double DEFAULT NULL,
`PER5_MIS` double DEFAULT NULL,
`PER6_MCL` double DEFAULT NULL,
`PER6_MFS` double DEFAULT NULL,
`PER6_MIS` double DEFAULT NULL,
`PER7_MCL` double DEFAULT NULL,
`PER7_MFS` double DEFAULT NULL,
`PER7_MIS` double DEFAULT NULL,
`BEFORE_DUE_7` double DEFAULT NULL,
`PER1` double DEFAULT NULL,
`PER2` double DEFAULT NULL,
`PER3` double DEFAULT NULL,
`PER4` double DEFAULT NULL,
`PER5` double DEFAULT NULL,
`PER6` double DEFAULT NULL,
`PER7` double DEFAULT NULL,
`REF` varchar(30) DEFAULT NULL,
`TYPE` varchar(1) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL
);
CREATE TABLE `t2` (
`RECEIVABLE_GROUP` char(2) DEFAULT NULL,
`CLIENT_NUMBER` varchar(35) DEFAULT NULL,
`CLIENT_NAME` varchar(73) DEFAULT NULL,
`PHONE_NUMBER` char(12) DEFAULT NULL,
`ATTENTION_NAME` char(26) DEFAULT NULL,
`PAYMENT_TERM` varchar(26) CHARACTER SET utf8 DEFAULT NULL,
`CREDIT_LIMIT` decimal(12,2) DEFAULT NULL,
`LAST_PAY_DATE` varchar(42) CHARACTER SET utf8 DEFAULT NULL,
`TOTAL` decimal(12,2) DEFAULT NULL,
`BEFORE_DUE_7` decimal(12,2) DEFAULT NULL,
`PER1` decimal(12,2) DEFAULT NULL,
`PER2` decimal(12,2) DEFAULT NULL,
`PER3` decimal(12,2) DEFAULT NULL,
`PER4` decimal(12,2) DEFAULT NULL,
`PER5` decimal(12,2) DEFAULT NULL,
`PER6` decimal(12,2) DEFAULT NULL,
`PER7` decimal(12,2) DEFAULT NULL,
`DIVISION` varchar(3) CHARACTER SET utf8 NOT NULL,
`CLIENT_INFO` varchar(294) CHARACTER SET utf8 DEFAULT NULL,
Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t2` where <expr_cache><0>(<in_optimizer>(0,0 in ( <materialize> (select 0 from dual ), <primary_index_lookup>(0 in <temporary table> on distinct_key where ((0 = `<subquery3>`.`b`))))))
Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t2` where <expr_cache><0>(<in_optimizer>(0,<exists>(select 0 from dual where (<cache>(0) = 0))))
SELECT * FROM t2 RIGHT JOIN v1 AS t ON t.a != 0
SELECT * FROM t2 RIGHT JOIN v1 AS t ON t.a != 0
WHERE t.a IN (SELECT b FROM t1);
WHERE t.a IN (SELECT b FROM t1);
a a b
a a b
...
@@ -362,9 +362,9 @@ WHERE t.a IN (SELECT b FROM t1);
...
@@ -362,9 +362,9 @@ WHERE t.a IN (SELECT b FROM t1);
id select_type table type possible_keys key key_len ref rows filtered Extra
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where
2 MATERIALIZED t1 system NULL NULL NULL NULL 1 100.00
Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t2` where <expr_cache><0>(<in_optimizer>(0,0 in ( <materialize> (select 0 from dual ), <primary_index_lookup>(0 in <temporary table> on distinct_key where ((0 = `<subquery2>`.`b`))))))
Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t2` where <expr_cache><0>(<in_optimizer>(0,<exists>(select 0 from dual where (<cache>(0) = 0))))