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WL#3700: Handler API change: all index search methods - that is,

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index_read(), index_read_idx(), index_read_last(), and
records_in_range() - instead of 'uint keylen' argument take
'ulonglong keypart_map', a bitmap showing which keyparts are
present in the key value.
Fallback method is provided for handlers that are lagging behind.
This commit is contained in:
serg@janus.mylan
2007-01-29 10:40:26 +01:00
parent 045d704709
commit a07fd5fa8f
58 changed files with 483 additions and 441 deletions
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38
sql/handler.h
View File

@@ -867,6 +867,18 @@ public:
{}
};
uint calculate_key_len(TABLE *, uint, const byte *, ulonglong);
/*
bitmap with first N+1 bits set
(keypart_map for a key prefix of [0..N] keyparts)
*/
#define make_keypart_map(N) (((ulonglong)2 << (N)) - 1)
/*
bitmap with first N bits set
(keypart_map for a key prefix of [0..N-1] keyparts)
*/
#define make_prev_keypart_map(N) (((ulonglong)1 << (N)) - 1)
/*
The handler class is the interface for dynamically loadable
storage engines. Do not add ifdefs and take care when adding or
@@ -1202,11 +1214,20 @@ public:
DBUG_ASSERT(FALSE);
return HA_ERR_WRONG_COMMAND;
}
virtual int index_read(byte * buf, const byte * key,
uint key_len, enum ha_rkey_function find_flag)
private:
virtual int index_read(byte * buf, const byte * key, uint key_len,
enum ha_rkey_function find_flag)
{ return HA_ERR_WRONG_COMMAND; }
public:
virtual int index_read(byte * buf, const byte * key, ulonglong keypart_map,
enum ha_rkey_function find_flag)
{
uint key_len= calculate_key_len(table, active_index, key, keypart_map);
return index_read(buf, key, key_len, find_flag);
}
virtual int index_read_idx(byte * buf, uint index, const byte * key,
uint key_len, enum ha_rkey_function find_flag);
ulonglong keypart_map,
enum ha_rkey_function find_flag);
virtual int index_next(byte * buf)
{ return HA_ERR_WRONG_COMMAND; }
virtual int index_prev(byte * buf)
@@ -1216,8 +1237,16 @@ public:
virtual int index_last(byte * buf)
{ return HA_ERR_WRONG_COMMAND; }
virtual int index_next_same(byte *buf, const byte *key, uint keylen);
private:
virtual int index_read_last(byte * buf, const byte * key, uint key_len)
{ return (my_errno=HA_ERR_WRONG_COMMAND); }
public:
virtual int index_read_last(byte * buf, const byte * key,
ulonglong keypart_map)
{
uint key_len= calculate_key_len(table, active_index, key, keypart_map);
return index_read_last(buf, key, key_len);
}
virtual int read_multi_range_first(KEY_MULTI_RANGE **found_range_p,
KEY_MULTI_RANGE *ranges, uint range_count,
bool sorted, HANDLER_BUFFER *buffer);
@@ -1243,8 +1272,7 @@ public:
{ return HA_ERR_WRONG_COMMAND; }
virtual int rnd_same(byte *buf, uint inx)
{ return HA_ERR_WRONG_COMMAND; }
virtual ha_rows records_in_range(uint inx, key_range *min_key,
key_range *max_key)
virtual ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key)
{ return (ha_rows) 10; }
virtual void position(const byte *record)=0;
virtual int info(uint)=0; // see my_base.h for full description