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Use the SQLITE_CONSTRAINT return value from xBestIndex to prohibit bad

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query plans in the pragma virtual table.

FossilOrigin-Name: b1259d4448f744861e416f42328c1450854370e5c77102d2a5abe5cf6c7f12bd
This commit is contained in:
drh
2024-03-25 11:34:42 +00:00
parent 4397d28378
commit 41c9945c74
3 changed files with 14 additions and 17 deletions
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manifest
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@@ -1,5 +1,5 @@
C Improvements\sto\sthe\svtablog.c\sextension:\s\sEliminate\smemory\sleaks.\nMore\sdiagnostic\soutput\sfor\sxBestIndex.
D 2024-03-25T10:55:08.289
C Use\sthe\sSQLITE_CONSTRAINT\sreturn\svalue\sfrom\sxBestIndex\sto\sprohibit\sbad\nquery\splans\sin\sthe\spragma\svirtual\stable.
D 2024-03-25T11:34:42.948
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -743,7 +743,7 @@ F src/parse.y 5bcef16094213efcc365a9d4dc4e3131f09251dc8838dce4a9e5f9764bff5b82
F src/pcache.c 040b165f30622a21b7a9a77c6f2e4877a32fb7f22d4c7f0d2a6fa6833a156a75
F src/pcache.h 1497ce1b823cf00094bb0cf3bac37b345937e6f910890c626b16512316d3abf5
F src/pcache1.c 602acb23c471bb8d557a6f0083cc2be641d6cafcafa19e481eba7ef4c9ca0f00
F src/pragma.c 4629926f936cdc586873d5ff24acb1af12a1db0172988a0dc2b32e46b798a640
F src/pragma.c f8f1845b42df684e9d31c5a1628c989a34939686049d7878bc5394ac1ae9cac4
F src/pragma.h e690a356c18e98414d2e870ea791c1be1545a714ba623719deb63f7f226d8bb7
F src/prepare.c 371f6115cb69286ebc12c6f2d7511279c2e47d9f54f475d46a554d687a3b312c
F src/printf.c 87b67bba3662a0523f39ae6b084a3907109702f717c654d6cecb838af5cd57f1
@@ -2182,8 +2182,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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U drh
Z 2928903171aaf3fcef9f3546955ace45
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# Remove this line to create a well-formed Fossil manifest.

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manifest.uuid
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@@ -1 +1 @@
92e9a71bc4daa261d7c9a81fb66f7d7c0f0a74eb9e0c9dec8b4651acc5217bff
b1259d4448f744861e416f42328c1450854370e5c77102d2a5abe5cf6c7f12bd

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src/pragma.c
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@@ -2870,9 +2870,9 @@ static int pragmaVtabBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
seen[0] = 0;
seen[1] = 0;
for(i=0; i<pIdxInfo->nConstraint; i++, pConstraint++){
if( pConstraint->usable==0 ) continue;
if( pConstraint->op!=SQLITE_INDEX_CONSTRAINT_EQ ) continue;
if( pConstraint->iColumn < pTab->iHidden ) continue;
if( pConstraint->op!=SQLITE_INDEX_CONSTRAINT_EQ ) continue;
if( pConstraint->usable==0 ) return SQLITE_CONSTRAINT;
j = pConstraint->iColumn - pTab->iHidden;
assert( j < 2 );
seen[j] = i+1;
@@ -2885,16 +2885,13 @@ static int pragmaVtabBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
j = seen[0]-1;
pIdxInfo->aConstraintUsage[j].argvIndex = 1;
pIdxInfo->aConstraintUsage[j].omit = 1;
if( seen[1]==0 ){
pIdxInfo->estimatedCost = (double)1000;
pIdxInfo->estimatedRows = 1000;
return SQLITE_OK;
}
pIdxInfo->estimatedCost = (double)20;
pIdxInfo->estimatedRows = 20;
if( seen[1] ){
j = seen[1]-1;
pIdxInfo->aConstraintUsage[j].argvIndex = 2;
pIdxInfo->aConstraintUsage[j].omit = 1;
}
return SQLITE_OK;
}