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Better comments in KEY_PART_INFO struct

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sergefp@mysql.com
2006-06-14 21:06:02 +04:00
parent d4942a2635
commit 6e5f578a46
1 changed files with 7 additions and 1 deletions
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8
sql/structs.h
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@@ -70,7 +70,13 @@ typedef struct st_key_part_info { /* Info about a key part */
Field *field; Field *field;
uint offset; /* offset in record (from 0) */ uint offset; /* offset in record (from 0) */
uint null_offset; /* Offset to null_bit in record */ uint null_offset; /* Offset to null_bit in record */
uint16 length; /* Length of key_part */ uint16 length; /* Length of keypart value in bytes */
/*
Number of bytes required to store the keypart value. This may be
different from the "length" field as it also counts
- possible NULL-flag byte (see HA_KEY_NULL_LENGTH)
- possible HA_KEY_BLOB_LENGTH bytes needed to store actual value length.
*/
uint16 store_length; uint16 store_length;
uint16 key_type; uint16 key_type;
uint16 fieldnr; /* Fieldnum in UNIREG */ uint16 fieldnr; /* Fieldnum in UNIREG */