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Enhance the comment on whereLoopAddBtree(). No changes to code.

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FossilOrigin-Name: b22dd165da227a52d88b17a91e80a1701dce61ad
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drh
2014-07-22 12:05:32 +00:00
parent 53ad7e48ab
commit 83a305f20e
3 changed files with 15 additions and 7 deletions
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12
manifest
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@@ -1,5 +1,5 @@
C For\sthe\sOR-optimization,\savoid\sgenerating\sOP_OpenRead\sopcodes\sthat\sreopen\nexactly\sthe\ssame\sindex. C Enhance\sthe\scomment\son\swhereLoopAddBtree().\s\sNo\schanges\sto\scode.
D 2014-07-22T00:40:45.480 D 2014-07-22T12:05:32.008
F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
F Makefile.in 5eb79e334a5de69c87740edd56af6527dd219308 F Makefile.in 5eb79e334a5de69c87740edd56af6527dd219308
F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -296,7 +296,7 @@ F src/vtab.c 21b932841e51ebd7d075e2d0ad1415dce8d2d5fd
F src/wal.c 264df50a1b33124130b23180ded2e2c5663c652a F src/wal.c 264df50a1b33124130b23180ded2e2c5663c652a
F src/wal.h df01efe09c5cb8c8e391ff1715cca294f89668a4 F src/wal.h df01efe09c5cb8c8e391ff1715cca294f89668a4
F src/walker.c 11edb74d587bc87b33ca96a5173e3ec1b8389e45 F src/walker.c 11edb74d587bc87b33ca96a5173e3ec1b8389e45
F src/where.c 4f8dce8f4e50b3b3675e8af7811e48526d6b4be2 F src/where.c 00c4b52d973f5176297ab3b633c8f5d8f9475af6
F src/whereInt.h 929c1349b5355fd44f22cee5c14d72b3329c58a6 F src/whereInt.h 929c1349b5355fd44f22cee5c14d72b3329c58a6
F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2 F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
@@ -1182,7 +1182,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32 F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
P f1c76c7c4c7d16855db60d16e23ecdf8d7ca862a P b67a6e33f23ce5f5d9a545fa9d6700a7ed636901
R ff4e333e5c258e291fb4ff256a0eb1e1 R 7e3c00e4bb7f0f9e6e95bc158e12c00a
U drh U drh
Z 9049ac2491ab8361811966ab022cf8d0 Z bea5212013e532ea4358a5003d399c52

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manifest.uuid
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@@ -1 +1 @@
b67a6e33f23ce5f5d9a545fa9d6700a7ed636901 b22dd165da227a52d88b17a91e80a1701dce61ad

8
src/where.c
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@@ -4577,6 +4577,14 @@ static int whereUsablePartialIndex(int iTab, WhereClause *pWC, Expr *pWhere){
** Normally, nSeek is 1. nSeek values greater than 1 come about if the ** Normally, nSeek is 1. nSeek values greater than 1 come about if the
** WHERE clause includes "x IN (....)" terms used in place of "x=?". Or when ** WHERE clause includes "x IN (....)" terms used in place of "x=?". Or when
** implicit "x IN (SELECT x FROM tbl)" terms are added for skip-scans. ** implicit "x IN (SELECT x FROM tbl)" terms are added for skip-scans.
**
** The estimated values (nRow, nVisit, nSeek) often contain a large amount
** of uncertainty. For this reason, scoring is designed to pick plans that
** "do the least harm" if the estimates are inaccurate. For example, a
** log(nRow) factor is omitted from a non-covering index scan in order to
** bias the scoring in favor of using an index, since the worst-case
** performance of using an index is far better than the worst-case performance
** of a full table scan.
*/ */
static int whereLoopAddBtree( static int whereLoopAddBtree(
WhereLoopBuilder *pBuilder, /* WHERE clause information */ WhereLoopBuilder *pBuilder, /* WHERE clause information */