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Experimental branch allowing different postulated scan rates for each index.

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FossilOrigin-Name: d59d97b0a8d70dc31d45db61bbc11ebb5375a224
This commit is contained in:
drh
2013-10-03 19:21:41 +00:00
parent d100f6912d
commit c28c4e5009
5 changed files with 56 additions and 26 deletions
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31
src/analyze.c
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@@ -1250,17 +1250,16 @@ struct analysisInfo {
** the array aOut[].
*/
static void decodeIntArray(
char *zIntArray,
int nOut,
tRowcnt *aOut,
int *pbUnordered
char *zIntArray, /* String containing int array to decode */
int nOut, /* Number of slots in aOut[] */
tRowcnt *aOut, /* Store integers here */
Index *pIndex /* Handle extra flags for this index, if not NULL */
){
char *z = zIntArray;
int c;
int i;
tRowcnt v;
assert( pbUnordered==0 || *pbUnordered==0 );
int v32;
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
if( z==0 ) z = "";
@@ -1276,8 +1275,20 @@ static void decodeIntArray(
aOut[i] = v;
if( *z==' ' ) z++;
}
if( pbUnordered && strcmp(z, "unordered")==0 ){
*pbUnordered = 1;
if( pIndex ){
while( z[0] ){
for(i=1; z[i] && z[i]!=' '; i++){}
if( i==9 && memcmp(z, "unordered", 9)==0 ){
pIndex->bUnordered = 1;
}else if( i>2 && memcmp(z, "r=", 2)==0
&& sqlite3GetInt32(z+2, &v32) ){
if( v32>255 ) v32 = 255;
if( v32<0 ) v32 = 0;
pIndex->iScanRatio = (u8)v32;
}
z += i;
if( z[0]==' ' ) z++;
}
}
}
@@ -1316,10 +1327,8 @@ static int analysisLoader(void *pData, int argc, char **argv, char **NotUsed){
z = argv[2];
if( pIndex ){
int bUnordered = 0;
decodeIntArray((char*)z, pIndex->nColumn+1, pIndex->aiRowEst,&bUnordered);
decodeIntArray((char*)z, pIndex->nColumn+1, pIndex->aiRowEst, pIndex);
if( pIndex->pPartIdxWhere==0 ) pTable->nRowEst = pIndex->aiRowEst[0];
pIndex->bUnordered = bUnordered;
}else{
decodeIntArray((char*)z, 1, &pTable->nRowEst, 0);
}