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Update the explain virtual table to make use of SQLITE_CONSTRAINT.

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FossilOrigin-Name: b2d41ff7027b44ccb5dffc303c47d42f1f6fd66ce22e90450d3a666c73fe8b8e
This commit is contained in:
drh 2018-11-16 19:19:58 +00:00
parent 43579191e8
commit d16f26a708
3 changed files with 30 additions and 18 deletions
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32
ext/misc/explain.c
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@ -18,6 +18,10 @@
** .load ./explain
** SELECT p2 FROM explain('SELECT * FROM sqlite_master')
** WHERE opcode='OpenRead';
**
** This module was originally written to help simplify SQLite testing,
** by providing an easier means of verifying certain patterns in the
** generated bytecode.
*/
#if !defined(SQLITEINT_H)
#include "sqlite3ext.h"
@ -232,22 +236,30 @@ static int explainBestIndex(
sqlite3_vtab *tab,
sqlite3_index_info *pIdxInfo
){
int i;
int i; /* Loop counter */
int idx = -1; /* Index of a usable == constraint against SQL */
int unusable = 0; /* True if there are unusable constraints on SQL */
pIdxInfo->estimatedCost = (double)1000000;
pIdxInfo->estimatedRows = 500;
for(i=0; i<pIdxInfo->nConstraint; i++){
struct sqlite3_index_constraint *p = &pIdxInfo->aConstraint[i];
if( p->usable
&& p->iColumn==EXPLN_COLUMN_SQL
&& p->op==SQLITE_INDEX_CONSTRAINT_EQ
){
if( p->iColumn!=EXPLN_COLUMN_SQL ) continue;
if( !p->usable ){
unusable = 1;
}else if( p->op==SQLITE_INDEX_CONSTRAINT_EQ ){
idx = i;
}
}
if( idx>=0 ){
/* There exists a usable == constraint against the SQL column */
pIdxInfo->estimatedCost = 10.0;
pIdxInfo->idxNum = 1;
pIdxInfo->aConstraintUsage[i].argvIndex = 1;
pIdxInfo->aConstraintUsage[i].omit = 1;
break;
}
pIdxInfo->aConstraintUsage[idx].argvIndex = 1;
pIdxInfo->aConstraintUsage[idx].omit = 1;
}else if( unusable ){
/* There are unusable constraints against the SQL column. Do not allow
** this plan to continue forward. */
return SQLITE_CONSTRAINT;
}
return SQLITE_OK;
}

12
manifest
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@ -1,5 +1,5 @@
C Fix\sthe\sJSON\stable-valued\sfunctions\sto\smake\suse\sof\sSQLITE_CONSTRAINT.
D 2018-11-16T16:04:50.796
C Update\sthe\sexplain\svirtual\stable\sto\smake\suse\sof\sSQLITE_CONSTRAINT.
D 2018-11-16T19:19:58.887
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F Makefile.in b730006b54c990461d864c5387f2e6f13aadb0236804555fb010ed6865a5f058
@ -281,7 +281,7 @@ F ext/misc/compress.c dd4f8a6d0baccff3c694757db5b430f3bbd821d8686d1fc24df55cf9f0
F ext/misc/csv.c 88333dc9f7dcf6a8148406f10ae04261e24e3b4c721550ae33e9e71f1265c1f1
F ext/misc/dbdump.c 12389a10c410fadf1e68eeb382def92d5a7fa9ce7cce4fb86a736fa2bac1000a
F ext/misc/eval.c 6ea9b22a5fa0dd973b67ca4e53555be177bc0b7b263aadf1024429457c82c0e3
F ext/misc/explain.c c82dd86f1156d32b284e0523a4bf6a93a85ab2a812caed48963e0774f3327185
F ext/misc/explain.c d5c12962d79913ef774b297006872af1fccda388f61a11d37758f9179a09551f
F ext/misc/fileio.c e3153b04433897a18a3d17185845f286892e96fdf87f4301290d09c36ae1759f
F ext/misc/fuzzer.c 7c64b8197bb77b7d64eff7cac7848870235d4c25
F ext/misc/ieee754.c f190d0cc5182529acb15babd177781be1ac1718c
@ -1778,7 +1778,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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R bb2adeaa580d1c642edf2f21d75f48f2
U drh
Z 7ed31881cc0f31c278a8f140145ccdcf
Z f6b6b46a521f0bb21911f77fd6557c2e

2
manifest.uuid
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@ -1 +1 @@
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