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WL#5370 Keep forward-compatibility when changing
'CREATE TABLE IF NOT EXISTS ... SELECT' behaviour BUG#47132, BUG#47442, BUG49494, BUG#23992 and BUG#48814 will disappear automatically after the this patch. BUG#55617 is fixed by this patch too. This is the 5.5 part. It implements: - 'CREATE TABLE IF NOT EXISTS ... SELECT' statement will not insert anything and binlog anything if the table already exists. It only generate a warning that table already exists. - A couple of test cases for the behavior changing.
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@ -469,7 +469,7 @@ drop table t1;
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CREATE TABLE t1 ( a INT );
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INSERT INTO t1 VALUES (1), (1);
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CREATE TABLE t2 ( a INT AUTO_INCREMENT KEY );
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CREATE TABLE IF NOT EXISTS t2 AS SELECT a FROM t1;
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INSERT INTO t2 SELECT a FROM t1;
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ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
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UPDATE t2 SET a = 2;
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SELECT a FROM t2;
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