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Do not use virtual (and hence redundant) WHERE-clause terms to restrict the 

content of a automatic partial index.  Show when an automatic partial index
is used in the EXPLAIN QUERY PLAN output.

FossilOrigin-Name: b9ad601eab1d7298d369267eb697c7fa1bc16985
This commit is contained in:
drh 2014-10-25 12:28:25 +00:00
parent 059b2d50e1
commit 051575cbf4
5 changed files with 15 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
ext/rtree/rtree6.test
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@ -102,7 +102,7 @@ do_eqp_test rtree6.2.4.2 {
SELECT * FROM t1,t2 WHERE v=10 and x1<10 and x2>10
} {
0 0 0 {SCAN TABLE t1 VIRTUAL TABLE INDEX 2:C0E1}
0 1 1 {SEARCH TABLE t2 USING AUTOMATIC COVERING INDEX (v=?)}
0 1 1 {SEARCH TABLE t2 USING AUTOMATIC PARTIAL COVERING INDEX (v=?)}
}
do_eqp_test rtree6.2.5 {

16
manifest
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@ -1,5 +1,5 @@
C Enhance\sthe\sautomatic\sindex\slogic\sso\sthat\sit\screates\sa\spartial\sindex\swhen\ndoing\sso\sgives\sthe\ssame\sanswer\sfor\sless\swork.
D 2014-10-24T19:28:09.216
C Do\snot\suse\svirtual\s(and\shence\sredundant)\sWHERE-clause\sterms\sto\srestrict\sthe\ncontent\sof\sa\sautomatic\spartial\sindex.\s\sShow\swhen\san\sautomatic\spartial\sindex\nis\sused\sin\sthe\sEXPLAIN\sQUERY\sPLAN\soutput.
D 2014-10-25T12:28:25.871
F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
F Makefile.in cf57f673d77606ab0f2d9627ca52a9ba1464146a
F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@ -130,7 +130,7 @@ F ext/rtree/rtree2.test acbb3a4ce0f4fbc2c304d2b4b784cfa161856bba
F ext/rtree/rtree3.test a494da55c30ee0bc9b01a91c80c81b387b22d2dc
F ext/rtree/rtree4.test c8fe384f60ebd49540a5fecc990041bf452eb6e0
F ext/rtree/rtree5.test 6a510494f12454bf57ef28f45bc7764ea279431e
F ext/rtree/rtree6.test 0cfbdf27ee086bf16a3da2c6f2d5b3d6473cb27e
F ext/rtree/rtree6.test 773a90db2dce6a8353dd0d5b64bca69b29761196
F ext/rtree/rtree7.test 1fa710b9e6bf997a0c1a537b81be7bb6fded1971
F ext/rtree/rtree8.test db79c812f9e4a11f9b1f3f9934007884610a713a
F ext/rtree/rtree9.test d86ebf08ff6328895613ed577dd8a2a37c472c34
@ -302,8 +302,8 @@ F src/vtab.c cb0c194303fea276b48d7d4b6d970b5a96bde8de
F src/wal.c 10e7de7ce90865a68153f001a61f1d985cd17983
F src/wal.h df01efe09c5cb8c8e391ff1715cca294f89668a4
F src/walker.c c253b95b4ee44b21c406e2a1052636c31ea27804
F src/where.c cc0733c59bd8bf6027d28b7d24b1887f4a870215
F src/whereInt.h 4b459cdbfc9b01f5f27673a35f9967e4dea917e8
F src/where.c 3312adfda33a9ca85c8a380a642a1a5905398b06
F src/whereInt.h 19279cd0664ce1d90b9ad3ef0108cb494acfe455
F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
F test/aggnested.test b35b4cd69fc913f90d39a575e171e1116c3a4bb7
@ -1206,7 +1206,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
P 401235edf40fcd665eaf426cf5155ac6855e8537
R def8f7d87d0f5784d9eaab2c56b2a690
P d95d0313c447f5baeabdb17284d8606331ab7d49
R 9499438a1fccf595ef80fbd4c31b20b8
U drh
Z cb611c4b71e8fc233ea4e1005f56a9e0
Z cdff8327924b867b12e561826d5fe961

2
manifest.uuid
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@ -1 +1 @@
d95d0313c447f5baeabdb17284d8606331ab7d49
b9ad601eab1d7298d369267eb697c7fa1bc16985

4
src/where.c
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@ -1612,6 +1612,7 @@ static void constructAutomaticIndex(
idxCols = 0;
for(pTerm=pWC->a; pTerm<pWCEnd; pTerm++){
if( pLoop->prereq==0
&& (pTerm->wtFlags & TERM_VIRTUAL)==0
&& sqlite3ExprIsTableConstant(pTerm->pExpr, pSrc->iCursor) ){
pPartial = sqlite3ExprAnd(pParse->db, pPartial,
sqlite3ExprDup(pParse->db, pTerm->pExpr, 0));
@ -1720,6 +1721,7 @@ static void constructAutomaticIndex(
if( pPartial ){
iContinue = sqlite3VdbeMakeLabel(v);
sqlite3ExprIfFalse(pParse, pPartial, iContinue, SQLITE_JUMPIFNULL);
pLoop->wsFlags |= WHERE_PARTIALIDX;
}
regRecord = sqlite3GetTempReg(pParse);
sqlite3GenerateIndexKey(pParse, pIdx, pLevel->iTabCur, regRecord, 0, 0, 0, 0);
@ -2865,6 +2867,8 @@ static void explainOneScan(
if( isSearch ){
zFmt = "PRIMARY KEY";
}
}else if( flags & WHERE_PARTIALIDX ){
zFmt = "AUTOMATIC PARTIAL COVERING INDEX";
}else if( flags & WHERE_AUTO_INDEX ){
zFmt = "AUTOMATIC COVERING INDEX";
}else if( flags & WHERE_IDX_ONLY ){

1
src/whereInt.h
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@ -459,3 +459,4 @@ struct WhereInfo {
#define WHERE_AUTO_INDEX 0x00004000 /* Uses an ephemeral index */
#define WHERE_SKIPSCAN 0x00008000 /* Uses the skip-scan algorithm */
#define WHERE_UNQ_WANTED 0x00010000 /* WHERE_ONEROW would have been helpful*/
#define WHERE_PARTIALIDX 0x00020000 /* The automatic index is partial */