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func_if.result, func_if.test:
Added a test case for bug #11142. item_cmpfunc.cc: Fixed bug #11142. Implementation of Item_func_nullif::is_null was corrected.
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@ -86,3 +86,30 @@ drop table t1;
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SELECT NULLIF(5,5) IS NULL, NULLIF(5,5) IS NOT NULL;
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NULLIF(5,5) IS NULL NULLIF(5,5) IS NOT NULL
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1 0
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DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (a CHAR(10));
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INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');
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SELECT a, NULLIF(a,'') FROM t1;
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a NULLIF(a,'')
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aaa aaa
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NULL NULL
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NULL
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bbb bbb
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SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
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a NULLIF(a,'')
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NULL NULL
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NULL
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DROP TABLE t1;
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CREATE TABLE t1 (a CHAR(10));
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INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');
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SELECT a, NULLIF(a,'') FROM t1;
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a NULLIF(a,'')
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aaa aaa
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NULL NULL
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NULL
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bbb bbb
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SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
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a NULLIF(a,'')
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NULL NULL
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NULL
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DROP TABLE t1;
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@ -60,3 +60,30 @@ drop table t1;
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# Bug #5595 NULLIF() IS NULL returns false if NULLIF() returns NULL
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#
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SELECT NULLIF(5,5) IS NULL, NULLIF(5,5) IS NOT NULL;
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#
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# Test to check evaluation of MULLIF when the first argument is NULL
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# (motivated by the Bug 11142)
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#
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--disable_warnings
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DROP TABLE IF EXISTS t1;
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--enable_warnings
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CREATE TABLE t1 (a CHAR(10));
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INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');
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SELECT a, NULLIF(a,'') FROM t1;
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SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
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DROP TABLE t1;
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#
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# Test for bug #11142: evaluation of NULLIF when the first argument is NULL
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#
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CREATE TABLE t1 (a CHAR(10));
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INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');
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SELECT a, NULLIF(a,'') FROM t1;
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SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
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DROP TABLE t1;
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@ -1161,9 +1161,7 @@ Item_func_nullif::val_str(String *str)
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bool
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Item_func_nullif::is_null()
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{
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if (!cmp.compare())
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return (null_value=1);
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return 0;
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return (null_value= (!cmp.compare() ? 1 : args[0]->null_value));
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}
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/*
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