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uint16_t fieldnr; /* Fieldnum in UNIREG (1,2,3,...) */
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uint16_t key_part_flag; /* 0 or HA_REVERSE_SORT */
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uint8_t null_bit; /* Position to null_bit */
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unsigned int key_length; /* Tot length of key */
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enum ha_key_alg algorithm;
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unsigned long flags; /* dupp key and pack flags */