114 lines
3.9 KiB
Plaintext
114 lines
3.9 KiB
Plaintext
--source include/have_partition.inc
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--echo #
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--echo # Bug#18167648: WRONG RESULTS WITH PARTITIONING, INDEX_MERGE AND NO PK
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--echo #
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CREATE TABLE t1 (
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a smallint,
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b smallint,
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c smallint,
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KEY a (a),
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KEY b (b)
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) ENGINE = MyISAM
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PARTITION BY HASH (c) PARTITIONS 3;
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CREATE TABLE t2 (a tinyint) ENGINE = MyISAM;
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INSERT INTO t2 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),
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(14),(15),(16);
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SET SESSION optimizer_switch="index_merge=on";
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SET SESSION optimizer_switch="index_merge_intersection=on";
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SET SESSION optimizer_switch="index_merge_union=off";
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SET SESSION optimizer_switch="index_merge_sort_union=off";
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INSERT INTO t1 VALUES (1,1,0), (1,1,0), (2,1,0), (2,2,1), (1,1,1), (2,2,4);
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--echo # Add some rows to make the index_merge_intersect possible
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INSERT INTO t1 SELECT 1,1,0 FROM t2 A, t2 B;
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INSERT INTO t1 SELECT 1,1,1 FROM t2 A, t2 B;
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INSERT INTO t1 SELECT 1,1,2 FROM t2 A, t2 B LIMIT 68;
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SELECT COUNT(*) FROM t1;
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ANALYZE TABLE t1;
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# For plan debugging
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let $use_optimizer_trace=0;
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if ($use_optimizer_trace)
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{
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SET optimizer_trace="enabled=on";
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}
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EXPLAIN SELECT a,b,c FROM t1 WHERE b = 2 AND a = 2;
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if ($use_optimizer_trace)
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{
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SELECT TRACE FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
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}
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--echo # Before fix:
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--echo # (p0 - partition 0, R3 - 3rd record in that partition = offset)
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--echo # Make 'a' read p0-R3, p1-R1, p1-R3
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--echo # Make 'b' read p1-R1, p1-R3
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--echo # 'b' will skip p1-R1 since R3 is bigger than R1.
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# b reads first row from p1 (0x0)
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# b returns 0x0 from p1
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# a reads 3rd row from p0 (0xe)
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# a read first row from p1 (0x0)
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# a returns 0xe from p0
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# b skips (0xe from p0 > 0x0 from p1)
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# b reads 3rd row from p1 (0xe)
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# b returns 0xe from p1
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# a skips (0xe from p1 > 0xe from p0)
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# a returns 0x0 from p1
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# a reads 3rd row from p1 (0xe)
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# a returns 0xe from p1
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# MATCH! (0xe from p1 == 0xe from p1)
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SELECT a,b,c FROM t1 WHERE b = 2 AND a = 2;
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SET @old_opt_switch = @@session.optimizer_switch;
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SET SESSION optimizer_switch="index_merge_intersection=off";
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--echo # Without index_merge_intersection
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SELECT a,b,c FROM t1 WHERE b = 2 AND a = 2;
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EXPLAIN SELECT a,b,c FROM t1 WHERE b = 2 AND a = 2;
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SET SESSION optimizer_switch="index_merge_union=on";
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EXPLAIN SELECT a,b,c FROM t1 WHERE (b = 2 OR a = 2) AND c > 0 AND c < 100;
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if ($use_optimizer_trace)
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{
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SELECT TRACE FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
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}
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# First there where a bug where index_init() was called with sorted=false :(
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# Before fix of secondary sort in ha_partition:
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# b reads first row from p1 (0x0)
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# b returns 0x0 from p1
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# a reads 3rd row from p0 (0xe)
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# a read first row from p1 (0x0)
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# a returns 0xe from p0
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# b < a in priority queue
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# b reads 3rd row from p1 (0xe)
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# b returns 0xe from p1
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# Fetch row 0x0 from p1 (2,2,1)
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# a returns 0x0 frop p1
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# Fetch row 0xe from p0 (2,1,0), but is filtered away from evaluate_join_record
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# a reads 3rd from from p1 (0xe)
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# a returns 0xe from p1
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# Fetch row 0x0 from p1 (2,2,1) (Dup, doh).
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# Fetch row 0xe from p1 (2,2,4)
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SELECT a,b,c FROM t1 WHERE (b = 2 OR a = 2) AND c > 0 AND c < 100;
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SET SESSION optimizer_switch="index_merge_union=off";
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SELECT a,b,c FROM t1 WHERE (b = 2 OR a = 2) AND c > 0 AND c < 100;
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EXPLAIN SELECT a,b,c FROM t1 WHERE (b = 2 OR a = 2) AND c > 0 AND c < 100;
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SET SESSION optimizer_switch="index_merge_sort_union=on";
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EXPLAIN SELECT a,b,c FROM t1 WHERE (b >= 2 OR a >= 2) AND c > 0 AND c < 100;
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if ($use_optimizer_trace)
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{
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SELECT TRACE FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
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SET SESSION optimizer_trace="enabled=off";
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}
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--echo # Not affected, added for completeness...
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# Verified that it does not demand sorted results, index_init(sorted=false)!
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SELECT a,b,c FROM t1 WHERE (b >= 2 OR a >= 2) AND c > 0 AND c < 100;
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SET SESSION optimizer_switch="index_merge_sort_union=off";
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SELECT a,b,c FROM t1 WHERE (b >= 2 OR a >= 2) AND c > 0 AND c < 100;
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EXPLAIN SELECT a,b,c FROM t1 WHERE (b >= 2 OR a >= 2) AND c > 0 AND c < 100;
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SET @@session.optimizer_switch = @old_opt_switch;
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DROP TABLE t1, t2;
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