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key_map part_of_sortkey;
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We use three additional unireg types for TIMESTAMP to overcome limitation
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of current binary format of .frm file. We'd like to be able to support
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NOW() as default and on update value for such fields but unable to hold
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this info anywhere except unireg_check field. This issue will be resolved
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in more clean way with transition to new text based .frm format.
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See also comment for Field_timestamp::Field_timestamp().
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We use three additional unireg types for TIMESTAMP for hysterical
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raisins and limitations in the MySQL FRM file format.
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A good TODO is to clean this up as we can support just about
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anything in the table proto message now.