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The problem was that some functions (namely IN() starting with 4.1, and CHAR() starting with 5.0) were returning NULL in certain conditions, while they didn't set their maybe_null flag. Because of that there could be some problems with 'IS NULL' check, and statements that depend on the function value domain, like CREATE TABLE t1 SELECT 1 IN (2, NULL);. The fix is to set maybe_null correctly. mysql-test/r/func_in.result: Add result for bug#17047: CHAR() and IN() can return NULL without signaling NULL result. mysql-test/t/func_in.test: Add test case for bug#17047: CHAR() and IN() can return NULL without signaling NULL result. sql/item_cmpfunc.cc: Remove assignment to maybe_null, as it was already set in fix_fields() based on all arguments, not only on the first.
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