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When copying varchar fields with field_conv() it's not taken into account that length_bytes of source and destination fields may be different. This results in saving wrong data in field and making wrong key later. Added check so if fields are varchar and have different length_bytes they are not copied by memcpy(). sql/field_conv.cc: Fix bug #11398 Bug in field_conv() results in wrong result of join with index mysql-test/t/select.test: Test case for bug #11398 Bug in field_conv() results in wrong result of join with index mysql-test/r/select.result: Test case for bug #11398 Bug in field_conv() results in wrong result of join with index
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