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text knn NE

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Alex Garcia 2024-11-18 12:15:25 -08:00
parent 31622209eb
commit 4ba167c315
3 changed files with 185 additions and 24 deletions
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47
sqlite-vec.c
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@ -5885,13 +5885,16 @@ int vec0_metadata_filter_text(vec0_vtab * p, sqlite3_value * value, const void *
sqlite3_blob_close(rowidsBlob);
switch(op) {
int nPrefix;
char * sPrefix;
char *sFull;
int nFull;
u8 * view;
case VEC0_METADATA_OPERATOR_EQ: {
for(int i = 0; i < size; i++) {
u8 * view = &((u8*) buffer)[i * VEC0_METADATA_TEXT_VIEW_BUFFER_LENGTH];
int nPrefix = ((int*) view)[0];
char * sPrefix = (char *) &view[4];
view = &((u8*) buffer)[i * VEC0_METADATA_TEXT_VIEW_BUFFER_LENGTH];
nPrefix = ((int*) view)[0];
sPrefix = (char *) &view[4];
// for EQ the text lengths must match
if(nPrefix != nTarget) {
@ -5925,11 +5928,39 @@ int vec0_metadata_filter_text(vec0_vtab * p, sqlite3_value * value, const void *
}
case VEC0_METADATA_OPERATOR_NE: {
for(int i = 0; i < size; i++) {
u8 * view = &((u8*) buffer)[i * VEC0_METADATA_TEXT_VIEW_BUFFER_LENGTH];
int n = ((int*) view)[0];
char * s = (char *) &view[4];
if(n > VEC0_METADATA_TEXT_VIEW_DATA_LENGTH) {rc = SQLITE_ERROR;goto done;} /* TODO */
bitmap_set(b, i, strncmp(s, sTarget, n) != 0);
view = &((u8*) buffer)[i * VEC0_METADATA_TEXT_VIEW_BUFFER_LENGTH];
nPrefix = ((int*) view)[0];
sPrefix = (char *) &view[4];
// for NE if text lengths dont match, it never will
if(nPrefix != nTarget) {
bitmap_set(b, i, 1);
continue;
}
int cmpPrefix = strncmp(sPrefix, sTarget, min(nPrefix, VEC0_METADATA_TEXT_VIEW_DATA_LENGTH));
// for short strings, use the prefix comparison direclty
if(nPrefix <= VEC0_METADATA_TEXT_VIEW_DATA_LENGTH) {
bitmap_set(b, i, cmpPrefix != 0);
continue;
}
// for NE on longs strings, if prefixes dont match, then long string wont
if(cmpPrefix) {
bitmap_set(b, i, 1);
continue;
}
// consult the full string
rc = vec0_get_metadata_text_long_value(p, &stmt, metadata_idx, rowids[i], &nFull, &sFull);
if(rc != SQLITE_OK) {
goto done;
}
if(nPrefix != nFull) {
rc = SQLITE_ERROR;
goto done;
}
bitmap_set(b, i, strncmp(sFull, sTarget, nFull) != 0);
}
break;
}