diff options
Diffstat (limited to 'include/my_base.h')
| -rw-r--r-- | include/my_base.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/include/my_base.h b/include/my_base.h index a01b2ec9b82..70bd9b5e073 100644 --- a/include/my_base.h +++ b/include/my_base.h @@ -255,7 +255,17 @@ enum ha_base_keytype { HA_BINARY_PACK_KEY | HA_FULLTEXT | HA_UNIQUE_CHECK | \ HA_SPATIAL | HA_NULL_ARE_EQUAL | HA_GENERATED_KEY) -#define HA_KEY_HAS_PART_KEY_SEG 65536 /* Key contains partial segments */ +/* + Key contains partial segments. + + This flag is internal to the MySQL server by design. It is not supposed + neither to be saved in FRM-files, nor to be passed to storage engines. + It is intended to pass information into internal static sort_keys(KEY *, + KEY *) function. + + This flag can be calculated -- it's based on key lengths comparison. +*/ +#define HA_KEY_HAS_PART_KEY_SEG 65536 /* Automatic bits in key-flag */ |