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Fix a bug in calculating the average number of entries for keys not present in the sqlite_stat4 table.

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FossilOrigin-Name: ec3ffb174844406a6186c3dcc41b76d0331b502c
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dan 2013-08-12 11:21:10 +00:00
parent 568cd51b79
commit 5133c78cae
3 changed files with 24 additions and 11 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Fix\sminor\sproblems\scaused\sby\sadding\sthe\srowid\sto\sthe\srecords\sin\sstat4.
D 2013-08-12T09:29:04.530
C Fix\sa\sbug\sin\scalculating\sthe\saverage\snumber\sof\sentries\sfor\skeys\snot\spresent\sin\sthe\ssqlite_stat4\stable.
D 2013-08-12T11:21:10.969
F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
F Makefile.in 5e41da95d92656a5004b03d3576e8b226858a28e
F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@ -157,7 +157,7 @@ F sqlite.pc.in 42b7bf0d02e08b9e77734a47798d1a55a9e0716b
F sqlite3.1 6be1ad09113570e1fc8dcaff84c9b0b337db5ffc
F sqlite3.pc.in ae6f59a76e862f5c561eb32a380228a02afc3cad
F src/alter.c 2af0330bb1b601af7a7789bf7229675fd772a083
F src/analyze.c 49729c117665fc927280c0bcd10bffa838ff29d1
F src/analyze.c fd1bcb9bc4ca29cd36f60c620cc501c933048c28
F src/attach.c 1816f5a9eea8d2010fc2b22b44f0f63eb3a62704
F src/auth.c 523da7fb4979469955d822ff9298352d6b31de34
F src/backup.c 43b348822db3e4cef48b2ae5a445fbeb6c73a165
@ -1106,7 +1106,7 @@ F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
F tool/wherecosttest.c f407dc4c79786982a475261866a161cd007947ae
F tool/win/sqlite.vsix 97894c2790eda7b5bce3cc79cb2a8ec2fde9b3ac
P 3a5e8ab7ddbe1d943b35ef329fe4e5a1bfdb0d9d
R 61c9bc8ff2fa4dfd3e5854cb245baf85
P 088d1ff94890ada50d43e6a366a58167ec5a8e96
R 4b6821682980828caa2dcfc6f067a6e7
U dan
Z 74fdc1c4224404aea1a5d8ea05036c15
Z 150d3ee65bd4be58d3670346ad74798d

2
manifest.uuid
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@ -1 +1 @@
088d1ff94890ada50d43e6a366a58167ec5a8e96
ec3ffb174844406a6186c3dcc41b76d0331b502c

21
src/analyze.c
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@ -1282,7 +1282,6 @@ static int loadStat4(sqlite3 *db, const char *zDb){
char *zIndex; /* Index name */
Index *pIdx; /* Pointer to the index object */
int i; /* Loop counter */
tRowcnt sumEq; /* Sum of the nEq values */
int nCol; /* Number of columns in index */
zIndex = (char *)sqlite3_column_text(pStmt, 0);
@ -1304,13 +1303,27 @@ static int loadStat4(sqlite3 *db, const char *zDb){
decodeIntArray((char*)sqlite3_column_text(pStmt,3), nCol, pSample->anDLt,0);
if( idx==pIdx->nSample-1 ){
IndexSample *aSample = pIdx->aSample;
int iCol;
for(iCol=0; iCol<pIdx->nColumn; iCol++){
tRowcnt sumEq = 0; /* Sum of the nEq values */
int nSum = 0; /* Number of terms contributing to sumEq */
tRowcnt avgEq = 0;
tRowcnt nDLt = pSample->anDLt[iCol];
if( nDLt>idx ){
for(i=0, sumEq=0; i<idx; i++) sumEq += pIdx->aSample[i].anEq[iCol];
avgEq = (pSample->anLt[iCol] - sumEq)/(nDLt - idx);
/* Set nSum to the number of distinct (iCol+1) field prefixes that
** occur in the stat4 table for this index before pSample. Set
** sumEq to the sum of the nEq values for column iCol for the same
** set (adding the value only once where there exist dupicate
** prefixes). */
for(i=0; i<(pIdx->nSample-1); i++){
if( aSample[i].anDLt[iCol]!=aSample[i+1].anDLt[iCol] ){
sumEq += aSample[i].anEq[iCol];
nSum++;
}
}
if( nDLt>nSum ){
avgEq = (pSample->anLt[iCol] - sumEq)/(nDLt - nSum);
}
if( avgEq==0 ) avgEq = 1;
pIdx->aAvgEq[iCol] = avgEq;