konstantin@mysql.com 6337ea8a40 A fix and test case for Bug#6297 "prepared statement, wrong handling ...

of <parameter> IS NULL":
we must not only set Item::null_value in Item_param, but implement
Item_param::is_null() to work well with IS NULL/IS NOT NULL clauses.

2004-11-21 12:04:27 +03:00

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