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This is coded to not cause a speed impact on top level AND expressions where we don't care if an AND expression returns 0 or NULL
29 lines
861 B
Plaintext
29 lines
861 B
Plaintext
#
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# Test of boolean operations with NULL
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#
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DROP TABLE IF EXISTS t1;
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SELECT IF(NULL AND 1, 1, 2), IF(1 AND NULL, 1, 2);
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SELECT NULL AND 1, 1 AND NULL, 0 AND NULL, NULL and 0;
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create table t1 (a int);
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insert into t1 values (0),(1),(NULL);
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SELECT * FROM t1 WHERE IF(a AND 1, 0, 1);
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SELECT * FROM t1 WHERE IF(1 AND a, 0, 1);
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SELECT * FROM t1 where NOT(a AND 1);
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SELECT * FROM t1 where NOT(1 AND a);
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SELECT * FROM t1 where (a AND 1)=0;
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SELECT * FROM t1 where (1 AND a)=0;
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SELECT * FROM t1 where (1 AND a)=1;
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SELECT * FROM t1 where (1 AND a) IS NULL;
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# Verify that NULL optimisation works in AND clause:
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SET @a=0, @b=0;
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SELECT * FROM t1 WHERE NULL AND (@a:=@a+1);
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SELECT * FROM t1 WHERE NOT(a>=0 AND NULL AND (@b:=@b+1));
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SELECT * FROM t1 WHERE a=2 OR (NULL AND (@a:=@a+1));
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SELECT * FROM t1 WHERE NOT(a=2 OR (NULL AND (@b:=@b+1)));
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SELECT @a, @b;
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DROP TABLE t1;
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