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Overview
| Comment: | Enhance the query planner so that IS and IS NULL operators are able to drive an index on a LEFT OUTER JOIN. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
c648539b52ca28c0b2cb61208e2c32b1 |
| User & Date: | drh 2016-03-31 20:40:28.501 |
Context
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2016-04-07
| ||
| 23:18 | Enhance the query planner so that IS and IS NULL operators are able to drive an index on a LEFT OUTER JOIN. (check-in: 84d2a09eab user: drh tags: branch-3.12.0) | |
|
2016-03-31
| ||
| 22:53 | Update the clean target in the MSVC makefile. (check-in: 69f4d83210 user: mistachkin tags: trunk) | |
| 21:16 | Enhance the query planner so that IS and IS NULL operators are able to drive an index on a LEFT OUTER JOIN. (check-in: f1e6bb952e user: drh tags: branch-3.9) | |
| 20:40 | Enhance the query planner so that IS and IS NULL operators are able to drive an index on a LEFT OUTER JOIN. (check-in: c648539b52 user: drh tags: trunk) | |
|
2016-03-30
| ||
| 16:23 | Updates for the MSVC makefiles. (check-in: 7cf0cab730 user: mistachkin tags: trunk) | |
Changes
Changes to src/where.c.
| ︙ | ︙ | |||
2197 2198 2199 2200 2201 2202 2203 |
pNew = pBuilder->pNew;
if( db->mallocFailed ) return SQLITE_NOMEM_BKPT;
assert( (pNew->wsFlags & WHERE_VIRTUALTABLE)==0 );
assert( (pNew->wsFlags & WHERE_TOP_LIMIT)==0 );
if( pNew->wsFlags & WHERE_BTM_LIMIT ){
opMask = WO_LT|WO_LE;
| < < | 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 |
pNew = pBuilder->pNew;
if( db->mallocFailed ) return SQLITE_NOMEM_BKPT;
assert( (pNew->wsFlags & WHERE_VIRTUALTABLE)==0 );
assert( (pNew->wsFlags & WHERE_TOP_LIMIT)==0 );
if( pNew->wsFlags & WHERE_BTM_LIMIT ){
opMask = WO_LT|WO_LE;
}else{
opMask = WO_EQ|WO_IN|WO_GT|WO_GE|WO_LT|WO_LE|WO_ISNULL|WO_IS;
}
if( pProbe->bUnordered ) opMask &= ~(WO_GT|WO_GE|WO_LT|WO_LE);
assert( pNew->u.btree.nEq<pProbe->nColumn );
|
| ︙ | ︙ | |||
2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 |
continue; /* ignore IS [NOT] NULL constraints on NOT NULL columns */
}
if( pTerm->prereqRight & pNew->maskSelf ) continue;
/* Do not allow the upper bound of a LIKE optimization range constraint
** to mix with a lower range bound from some other source */
if( pTerm->wtFlags & TERM_LIKEOPT && pTerm->eOperator==WO_LT ) continue;
pNew->wsFlags = saved_wsFlags;
pNew->u.btree.nEq = saved_nEq;
pNew->nLTerm = saved_nLTerm;
if( whereLoopResize(db, pNew, pNew->nLTerm+1) ) break; /* OOM */
pNew->aLTerm[pNew->nLTerm++] = pTerm;
pNew->prereq = (saved_prereq | pTerm->prereqRight) & ~pNew->maskSelf;
| > > > > > > > > > > > > | 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 |
continue; /* ignore IS [NOT] NULL constraints on NOT NULL columns */
}
if( pTerm->prereqRight & pNew->maskSelf ) continue;
/* Do not allow the upper bound of a LIKE optimization range constraint
** to mix with a lower range bound from some other source */
if( pTerm->wtFlags & TERM_LIKEOPT && pTerm->eOperator==WO_LT ) continue;
/* Do not allow IS constraints from the WHERE clause to be used by the
** right table of a LEFT JOIN. Only constraints in the ON clause are
** allowed */
if( (pSrc->fg.jointype & JT_LEFT)!=0
&& !ExprHasProperty(pTerm->pExpr, EP_FromJoin)
&& (eOp & (WO_IS|WO_ISNULL))!=0
){
testcase( eOp & WO_IS );
testcase( eOp & WO_ISNULL );
continue;
}
pNew->wsFlags = saved_wsFlags;
pNew->u.btree.nEq = saved_nEq;
pNew->nLTerm = saved_nLTerm;
if( whereLoopResize(db, pNew, pNew->nLTerm+1) ) break; /* OOM */
pNew->aLTerm[pNew->nLTerm++] = pTerm;
pNew->prereq = (saved_prereq | pTerm->prereqRight) & ~pNew->maskSelf;
|
| ︙ | ︙ |