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for field values appended to sorted values in records to be sorted
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Only fixed layout is supported now.
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themselves. Offsets are from the last sorted field, that is from the
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record referefence, which is still last component of sorted records.
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It is preserved for backward compatiblility.
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in the sort buffer. It is used also when these values are read
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from a temporary file/buffer. As the reading procedures are beyond the
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scope of the 'filesort' code the values have to be retrieved via