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Previously, UDF *_init functions were passed constant strings with erroneous lengths. The length came from the containing variable's size, not the length of the value itself. Now the *_init functions get the constant as a null terminated string with the correct length supplied. mysql-test/r/udf.result: Test case to check constants passed UDFs. mysql-test/t/udf.test: Test case to check constants passed UDFs. sql/item_func.cc: UDF _init functions are now passed the length of the constants, rather than the max length of the var containing the constant. sql/udf_example.c: Added check_const_len functions. The check_const_len_init functions checks that the lengths of constants are correctly passed.
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