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correct the bitmap_set_bit when a field is timestamp and described with default CURRENT_TIMESTAMP or on update CURRENT_TIMESTAMP, then it will reduce a little time cost when the field doesnot need to write.
0bbae247
correct the bitmap_set_bit when a field is timestamp and described with default CURRENT_TIMESTAMP or on update CURRENT_TIMESTAMP, then it will reduce a little time cost when the field doesnot need to write.