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When the INSERT .. ON DUPLICATE KEY UPDATE has to update a matched row but the new data is the same as in the record then it returns as if no rows were inserted or updated. Nevertheless the row is silently updated. This leads to a situation when zero updated rows are reported in the case when data has actually been changed. Now the write_record function updates a row only if new data differs from that in the record. sql/sql_insert.cc: Bug#28904: INSERT .. ON DUPLICATE was silently updating rows when it shouldn't. Now the write_record function updates a row only if new data differs from that in the record. mysql-test/r/insert_update.result: Added a test case for the bug#28904: INSERT .. ON DUPLICATE was silently updating rows when it shouldn't. mysql-test/t/insert_update.test: Added a test case for the bug#28904: INSERT .. ON DUPLICATE was silently updating rows when it shouldn't.
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