diff options
Diffstat (limited to 'sql/structs.h')
| -rw-r--r-- | sql/structs.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/sql/structs.h b/sql/structs.h index 78f00f72df1..38bb441fc03 100644 --- a/sql/structs.h +++ b/sql/structs.h @@ -54,7 +54,13 @@ typedef struct st_key_part_info { /* Info about a key part */ Field *field; uint offset; /* offset in record (from 0) */ 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 key_type; uint16 fieldnr; /* Fieldnum in UNIREG */ @@ -174,7 +180,7 @@ typedef struct user_resources { uint questions; /* Maximum number of updating statements per hour (which statements are - updating is defined by uc_update_queries array). + updating is defined by sql_command_flags array). */ uint updates; /* Maximum number of connections established per hour. */ |