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planner: fix the issue that UnionScan returns wrong results in dynamic mode (#26876) #26912

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planner: fix the issue that UnionScan returns wrong results in dynamic mode (#26876) #26912

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cbfd4e1
cherry pick #26876 to release-5.1
qw4990 Aug 4, 2021
ba4cf25
fixup
qw4990 Aug 5, 2021
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35 changes: 29 additions & 6 deletions cmd/explaintest/r/generated_columns.result
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Original file line number Diff line number Diff line change
Expand Up @@ -105,14 +105,37 @@ PARTITION p5 VALUES LESS THAN (6),
PARTITION max VALUES LESS THAN MAXVALUE);
EXPLAIN format = 'brief' SELECT * FROM sgc3 WHERE a <= 1;
id estRows task access object operator info
TableReader 3323.33 root partition:p0,p1 data:Selection
└─Selection 3323.33 cop[tikv] le(test.sgc3.a, 1)
└─TableFullScan 10000.00 cop[tikv] table:sgc3 keep order:false, stats:pseudo
PartitionUnion 6646.67 root
├─TableReader 3323.33 root data:Selection
│ └─Selection 3323.33 cop[tikv] le(test.sgc3.a, 1)
│ └─TableFullScan 10000.00 cop[tikv] table:sgc3, partition:p0 keep order:false, stats:pseudo
└─TableReader 3323.33 root data:Selection
└─Selection 3323.33 cop[tikv] le(test.sgc3.a, 1)
└─TableFullScan 10000.00 cop[tikv] table:sgc3, partition:p1 keep order:false, stats:pseudo
EXPLAIN format = 'brief' SELECT * FROM sgc3 WHERE a < 7;
id estRows task access object operator info
TableReader 3323.33 root partition:all data:Selection
└─Selection 3323.33 cop[tikv] lt(test.sgc3.a, 7)
└─TableFullScan 10000.00 cop[tikv] table:sgc3 keep order:false, stats:pseudo
PartitionUnion 23263.33 root
├─TableReader 3323.33 root data:Selection
│ └─Selection 3323.33 cop[tikv] lt(test.sgc3.a, 7)
│ └─TableFullScan 10000.00 cop[tikv] table:sgc3, partition:p0 keep order:false, stats:pseudo
├─TableReader 3323.33 root data:Selection
│ └─Selection 3323.33 cop[tikv] lt(test.sgc3.a, 7)
│ └─TableFullScan 10000.00 cop[tikv] table:sgc3, partition:p1 keep order:false, stats:pseudo
├─TableReader 3323.33 root data:Selection
│ └─Selection 3323.33 cop[tikv] lt(test.sgc3.a, 7)
│ └─TableFullScan 10000.00 cop[tikv] table:sgc3, partition:p2 keep order:false, stats:pseudo
├─TableReader 3323.33 root data:Selection
│ └─Selection 3323.33 cop[tikv] lt(test.sgc3.a, 7)
│ └─TableFullScan 10000.00 cop[tikv] table:sgc3, partition:p3 keep order:false, stats:pseudo
├─TableReader 3323.33 root data:Selection
│ └─Selection 3323.33 cop[tikv] lt(test.sgc3.a, 7)
│ └─TableFullScan 10000.00 cop[tikv] table:sgc3, partition:p4 keep order:false, stats:pseudo
├─TableReader 3323.33 root data:Selection
│ └─Selection 3323.33 cop[tikv] lt(test.sgc3.a, 7)
│ └─TableFullScan 10000.00 cop[tikv] table:sgc3, partition:p5 keep order:false, stats:pseudo
└─TableReader 3323.33 root data:Selection
└─Selection 3323.33 cop[tikv] lt(test.sgc3.a, 7)
└─TableFullScan 10000.00 cop[tikv] table:sgc3, partition:max keep order:false, stats:pseudo
DROP TABLE IF EXISTS t1;
CREATE TABLE t1(a INT, b INT AS (a+1) VIRTUAL, c INT AS (b+1) VIRTUAL, d INT AS (c+1) VIRTUAL, KEY(b), INDEX IDX(c, d));
INSERT INTO t1 (a) VALUES (0);
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