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addresses #1567

Browse source 
write function to create a row descriptor
untested, just verified that it compiles
also currently unused

git-svn-id: file:///svn/mysql/tokudb-engine/src@10950 c7de825b-a66e-492c-adef-691d508d4ae1
This commit is contained in:
Zardosht Kasheff 2013-04-17 00:01:49 -04:00 • committed by Yoni Fogel
parent 0944e9198a
commit a8375cb5c9
2 changed files with 60 additions and 4 deletions
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62
storage/tokudb/hatoku_cmp.cc
View file

@ -1133,7 +1133,7 @@ int tokudb_prefix_cmp_packed_key(DB *file, const DBT *keya, const DBT *keyb) {
// outputs a descriptor for key into buf. num_bytes returns number of bytes used in buf
// to store the descriptor
//
int create_key_descriptor(KEY* key, uchar* buf, u_int32_t* num_bytes) {
int create_toku_key_descriptor(KEY* key, uchar* buf) {
int ret_val = 0;
uchar* pos = buf;
u_int32_t num_bytes_in_field = 0;
@ -1217,6 +1217,62 @@ int create_key_descriptor(KEY* key, uchar* buf, u_int32_t* num_bytes) {
}
}
*num_bytes = pos - buf;
return ret_val;
return pos - buf;
}
int create_toku_descriptor(uchar* buf, bool is_first_hpk, KEY* first_key, bool is_second_hpk, KEY* second_key) {
uchar* pos = buf + 4;
u_int32_t num_bytes = 0;
u_int32_t offset = 0;
if (is_first_hpk) {
pos[0] = 1;
pos++;
goto exit;
}
//
// first key is NOT a hidden primary key, so we now pack first_key
//
pos[0] = 0;
pos++;
num_bytes = create_toku_key_descriptor(first_key, pos);
pos += num_bytes;
//
// if we do not have a second key, we can jump to exit right now
// we do not have a second key if it is not a hidden primary key
// and if second_key is NULL
//
if (!is_second_hpk && (second_key == NULL) ) {
goto exit;
}
//
// at this point, we have a second key, so we need to write an offset
// into the first four bytes
//
offset = pos - buf;
buf[0] = (uchar)(offset & 255);
buf[1] = (uchar)((offset >> 8) & 255);
buf[2] = (uchar)((offset >> 16) & 255);
buf[3] = (uchar)((offset >> 24) & 255);
//
// if we have a second key, and it is an hpk, we need to pack it, and
// write in the offset to this position in the first four bytes
//
if (is_second_hpk) {
pos[0] = 1;
pos++;
goto exit;
}
pos[0] = 0;
pos++;
num_bytes = create_toku_key_descriptor(second_key, pos);
pos += num_bytes;
exit:
return pos - buf;
}

2
storage/tokudb/hatoku_cmp.h
View file

@ -121,7 +121,7 @@ int tokudb_cmp_primary_key(DB *file, const DBT *keya, const DBT *keyb);
//TODO: QQQ Only do one direction for prefix.
int tokudb_prefix_cmp_packed_key(DB *file, const DBT *keya, const DBT *keyb);
int create_key_descriptor(KEY* key, uchar* buf, u_int32_t* num_bytes);
int create_toku_key_descriptor(KEY* key, uchar* buf);
#endif