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Overview
| Comment: | Fix the STAT4 range scan estimates for DESC indexes. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
e3fe84005259ef9a6027d25793514ceb |
| User & Date: | drh 2014-10-08 02:53:25.568 |
Context
|
2014-10-08
| ||
| 11:11 | Remove some temporary code in mallocA.test that was accidentally checked in. (check-in: dedd15f7cd user: dan tags: trunk) | |
| 02:53 | Fix the STAT4 range scan estimates for DESC indexes. (check-in: e3fe840052 user: drh tags: trunk) | |
| 00:08 | More intuitive labels on ".wheretrace" output. (check-in: adcb3fed48 user: drh tags: trunk) | |
Changes
Changes to src/where.c.
| ︙ | ︙ | |||
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}else{
/* Note: this call could be optimized away - since the same values must
** have been requested when testing key $P in whereEqualScanEst(). */
whereKeyStats(pParse, p, pRec, 0, a);
iLower = a[0];
iUpper = a[0] + a[1];
}
/* If possible, improve on the iLower estimate using ($P:$L). */
if( pLower ){
int bOk; /* True if value is extracted from pExpr */
Expr *pExpr = pLower->pExpr->pRight;
| > > > > > > > < | < | | 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 |
}else{
/* Note: this call could be optimized away - since the same values must
** have been requested when testing key $P in whereEqualScanEst(). */
whereKeyStats(pParse, p, pRec, 0, a);
iLower = a[0];
iUpper = a[0] + a[1];
}
assert( pLower==0 || (pLower->eOperator & (WO_GT|WO_GE))!=0 );
assert( pUpper==0 || (pUpper->eOperator & (WO_LT|WO_LE))!=0 );
if( p->pKeyInfo && p->pKeyInfo->aSortOrder[nEq] ){
/* The roles of pLower and pUpper are swapped for a DESC index */
SWAP(WhereTerm*, pLower, pUpper);
}
/* If possible, improve on the iLower estimate using ($P:$L). */
if( pLower ){
int bOk; /* True if value is extracted from pExpr */
Expr *pExpr = pLower->pExpr->pRight;
rc = sqlite3Stat4ProbeSetValue(pParse, p, &pRec, pExpr, aff, nEq, &bOk);
if( rc==SQLITE_OK && bOk ){
tRowcnt iNew;
whereKeyStats(pParse, p, pRec, 0, a);
iNew = a[0] + ((pLower->eOperator & (WO_GT|WO_LE)) ? a[1] : 0);
if( iNew>iLower ) iLower = iNew;
nOut--;
pLower = 0;
}
}
/* If possible, improve on the iUpper estimate using ($P:$U). */
if( pUpper ){
int bOk; /* True if value is extracted from pExpr */
Expr *pExpr = pUpper->pExpr->pRight;
rc = sqlite3Stat4ProbeSetValue(pParse, p, &pRec, pExpr, aff, nEq, &bOk);
if( rc==SQLITE_OK && bOk ){
tRowcnt iNew;
whereKeyStats(pParse, p, pRec, 1, a);
iNew = a[0] + ((pUpper->eOperator & (WO_GT|WO_LE)) ? a[1] : 0);
if( iNew<iUpper ) iUpper = iNew;
nOut--;
pUpper = 0;
}
}
pBuilder->pRec = pRec;
|
| ︙ | ︙ |
Added test/analyzeE.test.
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# 2014-10-08
#
# The author disclaims copyright to this source code. In place of
# a legal notice, here is a blessing:
#
# May you do good and not evil.
# May you find forgiveness for yourself and forgive others.
# May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements tests for using STAT4 information
# on a descending index in a range query.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set ::testprefix analyzeE
ifcapable {!stat4} {
finish_test
return
}
# Verify that range queries on an ASCENDING index will use the
# index only if the range covers only a small fraction of the
# entries.
#
do_execsql_test analyzeE-1.0 {
CREATE TABLE t1(a,b);
WITH RECURSIVE
cnt(x) AS (VALUES(1000) UNION ALL SELECT x+1 FROM cnt WHERE x<2000)
INSERT INTO t1(a,b) SELECT x, x FROM cnt;
CREATE INDEX t1a ON t1(a);
ANALYZE;
} {}
do_execsql_test analyzeE-1.1 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 500 AND 2500;
} {/SCAN TABLE t1/}
do_execsql_test analyzeE-1.2 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 2900 AND 3000;
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-1.3 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 1700 AND 1750;
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-1.4 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 1 AND 500
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-1.5 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 3000 AND 3000000
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-1.6 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<500
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-1.7 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>2500
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-1.8 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>1900
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-1.9 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>1100
} {/SCAN TABLE t1/}
do_execsql_test analyzeE-1.10 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<1100
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-1.11 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<1900
} {/SCAN TABLE t1/}
# Verify that everything works the same on a DESCENDING index.
#
do_execsql_test analyzeE-2.0 {
DROP INDEX t1a;
CREATE INDEX t1a ON t1(a DESC);
ANALYZE;
} {}
do_execsql_test analyzeE-2.1 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 500 AND 2500;
} {/SCAN TABLE t1/}
do_execsql_test analyzeE-2.2 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 2900 AND 3000;
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-2.3 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 1700 AND 1750;
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-2.4 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 1 AND 500
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-2.5 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 3000 AND 3000000
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-2.6 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<500
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-2.7 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>2500
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-2.8 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>1900
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-2.9 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>1100
} {/SCAN TABLE t1/}
do_execsql_test analyzeE-2.10 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<1100
} {/SEARCH TABLE t1 USING INDEX t1a/}
do_execsql_test analyzeE-2.11 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<1900
} {/SCAN TABLE t1/}
# Now do a range query on the second term of an ASCENDING index
# where the first term is constrained by equality.
#
do_execsql_test analyzeE-3.0 {
DROP TABLE t1;
CREATE TABLE t1(a,b,c);
WITH RECURSIVE
cnt(x) AS (VALUES(1000) UNION ALL SELECT x+1 FROM cnt WHERE x<2000)
INSERT INTO t1(a,b,c) SELECT x, x, 123 FROM cnt;
CREATE INDEX t1ca ON t1(c,a);
ANALYZE;
} {}
do_execsql_test analyzeE-3.1 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 500 AND 2500 AND c=123;
} {/SCAN TABLE t1/}
do_execsql_test analyzeE-3.2 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 2900 AND 3000 AND c=123;
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-3.3 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 1700 AND 1750 AND c=123;
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-3.4 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 1 AND 500 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-3.5 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 3000 AND 3000000 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-3.6 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<500 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-3.7 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>2500 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-3.8 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>1900 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-3.9 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>1100 AND c=123
} {/SCAN TABLE t1/}
do_execsql_test analyzeE-3.10 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<1100 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-3.11 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<1900 AND c=123
} {/SCAN TABLE t1/}
# Repeat the 3.x tests using a DESCENDING index
#
do_execsql_test analyzeE-4.0 {
DROP INDEX t1ca;
CREATE INDEX t1ca ON t1(c ASC,a DESC);
ANALYZE;
} {}
do_execsql_test analyzeE-4.1 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 500 AND 2500 AND c=123;
} {/SCAN TABLE t1/}
do_execsql_test analyzeE-4.2 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 2900 AND 3000 AND c=123;
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-4.3 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 1700 AND 1750 AND c=123;
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-4.4 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 1 AND 500 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-4.5 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a BETWEEN 3000 AND 3000000 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-4.6 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<500 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-4.7 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>2500 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-4.8 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>1900 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-4.9 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a>1100 AND c=123
} {/SCAN TABLE t1/}
do_execsql_test analyzeE-4.10 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<1100 AND c=123
} {/SEARCH TABLE t1 USING INDEX t1ca/}
do_execsql_test analyzeE-4.11 {
EXPLAIN QUERY PLAN
SELECT * FROM t1 WHERE a<1900 AND c=123
} {/SCAN TABLE t1/}
finish_test
|