diff options
Diffstat (limited to 'include/my_handler.h')
| -rw-r--r-- | include/my_handler.h | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/include/my_handler.h b/include/my_handler.h index 61665090853..ea027b18725 100644 --- a/include/my_handler.h +++ b/include/my_handler.h @@ -22,6 +22,28 @@ #include "m_ctype.h" #include "myisampack.h" +/* + There is a hard limit for the maximum number of keys as there are only + 8 bits in the index file header for the number of keys in a table. + This means that 0..255 keys can exist for a table. The idea of + HA_MAX_POSSIBLE_KEY is to ensure that one can use myisamchk & tools on + a MyISAM table for which one has more keys than MyISAM is normally + compiled for. If you don't have this, you will get a core dump when + running myisamchk compiled for 128 keys on a table with 255 keys. +*/ + +#define HA_MAX_POSSIBLE_KEY 255 /* For myisamchk */ +/* + The following defines can be increased if necessary. + But beware the dependency of HA_MAX_POSSIBLE_KEY_BUFF and HA_MAX_KEY_LENGTH. +*/ + +#define HA_MAX_KEY_LENGTH 1000 /* Max length in bytes */ +#define HA_MAX_KEY_SEG 16 /* Max segments for key */ + +#define HA_MAX_POSSIBLE_KEY_BUFF (HA_MAX_KEY_LENGTH + 24+ 6+6) +#define HA_MAX_KEY_BUFF (HA_MAX_KEY_LENGTH+HA_MAX_KEY_SEG*6+8+8) + typedef struct st_HA_KEYSEG /* Key-portion */ { CHARSET_INFO *charset; @@ -81,7 +103,7 @@ typedef struct st_HA_KEYSEG /* Key-portion */ #define clr_rec_bits(bit_ptr, bit_ofs, bit_len) \ set_rec_bits(0, bit_ptr, bit_ofs, bit_len) -extern int mi_compare_text(CHARSET_INFO *, uchar *, uint, uchar *, uint , +extern int ha_compare_text(CHARSET_INFO *, uchar *, uint, uchar *, uint , my_bool, my_bool); extern int ha_key_cmp(register HA_KEYSEG *keyseg, register uchar *a, register uchar *b, uint key_length, uint nextflag, |