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46 lines
1.2 KiB
Plaintext
46 lines
1.2 KiB
Plaintext
--source include/have_innodb.inc
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########################################################################
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# Bug #857590: Fast index creation does not update index statistics
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########################################################################
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CREATE TABLE t1(
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id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
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a CHAR(1) NOT NULL,
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b CHAR(36) NOT NULL) ENGINE=InnoDB;
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INSERT INTO t1(a,b) VALUES ('a','b');
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INSERT INTO t1(a,b) SELECT a,b FROM t1;
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INSERT INTO t1(a,b) SELECT a,b FROM t1;
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INSERT INTO t1(a,b) SELECT a,b FROM t1;
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INSERT INTO t1(a,b) SELECT a,b FROM t1;
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# Check that fast index creation is used
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--enable_info
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ALTER TABLE t1 ADD KEY (a);
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--disable_info
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# The default (wrong) plan due to bogus statistics
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--vertical_results
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EXPLAIN SELECT COUNT(*) FROM t1, t1 t2 WHERE t1.a = t2.a AND t1.b = t2.b;
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--horizontal_results
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ALTER TABLE t1 DROP KEY a;
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SET expand_fast_index_creation = 1;
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SELECT @@expand_fast_index_creation;
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# Check that stats are updated with the option enabled
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--enable_info
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ALTER TABLE t1 ADD KEY (a);
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--disable_info
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--vertical_results
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EXPLAIN SELECT COUNT(*) FROM t1, t1 t2 WHERE t1.a = t2.a AND t1.b = t2.b;
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--horizontal_results
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SET expand_fast_index_creation = 0;
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DROP TABLE t1;
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