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Added the MAX_LENGTH_FOR_SORT_DATA option
filesort.cc:
  Added the MAX_LENGTH_FOR_SORT_DATA option
This commit is contained in:
igor@hundin.mysql.fi
2003-04-24 14:33:33 +03:00
parent 5610c4dea6
commit 80615fade2
15 changed files with 534 additions and 190 deletions
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33
sql/sql_sort.h
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@ -19,6 +19,30 @@
#define MERGEBUFF 7
#define MERGEBUFF2 15
/*
The structure SORT_ADDON_FIELD describes a fixed layout
for field values appended to sorted values in records to be sorted
in the sort buffer.
Only fixed layout is supported now.
Null bit maps for the appended values is placed before the values
themselves. Offsets are from the last sorted field, that is from the
record referefence, which is still last component of sorted records.
It is preserved for backward compatiblility.
The structure is used tp store values of the additional fields
in the sort buffer. It is used also when these values are read
from a temporary file/buffer. As the reading procedures are beyond the
scope of the 'filesort' code the values have to be retrieved via
the callback function 'unpack_addon_fields'.
*/
typedef struct st_sort_addon_field { /* Sort addon packed field */
Field *field; /* Original field */
uint offset; /* Offset from the last sorted field */
uint null_offset; /* Offset to to null bit from the last sorted field */
uint length; /* Length in the sort buffer */
uint8 null_bit; /* Null bit mask for the field */
} SORT_ADDON_FIELD;
typedef struct st_buffpek { /* Struktur om sorteringsbuffrarna */
my_off_t file_pos; /* Where we are in the sort file */
uchar *base,*key; /* key pointers */
@ -27,15 +51,18 @@ typedef struct st_buffpek { /* Struktur om sorteringsbuffrarna */
ulong max_keys; /* Max keys in buffert */
} BUFFPEK;
typedef struct st_sort_param {
uint sort_length; /* Length of sort columns */
uint keys; /* Max keys / buffert */
uint rec_length; /* Length of sorted records */
uint sort_length; /* Length of sorted columns */
uint ref_length; /* Length of record ref. */
uint addon_length; /* Length of added packed fields */
uint res_length; /* Length of records in final sorted file/buffer */
uint keys; /* Max keys / buffer */
ha_rows max_rows,examined_rows;
TABLE *sort_form; /* For quicker make_sortkey */
SORT_FIELD *local_sortorder;
SORT_FIELD *end;
SORT_ADDON_FIELD *addon_field; /* Descriptors for companion fields */
uchar *unique_buff;
bool not_killable;
char* tmp_buffer;