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Overview
| Comment: | In sqlite3FindInIndex(), improve internal comments and avoid an unreachable branch. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | rowvalue |
| Files: | files | file ages | folders |
| SHA1: | 55945fc12f8157e32e6850e41575c0c6 |
| User & Date: | drh 2016-08-24 18:51:23 |
Context
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2016-08-24
| ||
| 21:24 | Improved extended comments of comparison operators when the SQLITE_STOREP2 flags is set on P5. No changes to non-debug code. check-in: bbc1b016 user: drh tags: rowvalue | |
| 18:51 | In sqlite3FindInIndex(), improve internal comments and avoid an unreachable branch. check-in: 55945fc1 user: drh tags: rowvalue | |
| 17:49 | Fix more unreachable branches. check-in: 6099c180 user: drh tags: rowvalue | |
Changes
Changes to src/expr.c.
2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 |
/* This function is only called from two places. In both cases the vdbe
** has already been allocated. So assume sqlite3GetVdbe() is always
** successful here.
*/
assert(v);
if( nExpr==1 && pEList->a[0].pExpr->iColumn<0 ){
int iAddr = sqlite3CodeOnce(pParse);
VdbeCoverage(v);
sqlite3OpenTable(pParse, iTab, iDb, pTab, OP_OpenRead);
eType = IN_INDEX_ROWID;
sqlite3VdbeJumpHere(v, iAddr);
}else{
Index *pIdx; /* Iterator variable */
int affinity_ok = 1;
int i;
/* Check that the affinity that will be used to perform each
** comparison is the same as the affinity of each column. If
** it not, it is not possible to use any index. */
for(i=0; i<nExpr && affinity_ok; i++){
Expr *pLhs = sqlite3VectorFieldSubexpr(pX->pLeft, i);
int iCol = pEList->a[i].pExpr->iColumn;
char idxaff = pTab->aCol[iCol].affinity;
char cmpaff = sqlite3CompareAffinity(pLhs, idxaff);
switch( cmpaff ){
case SQLITE_AFF_BLOB:
break;
case SQLITE_AFF_TEXT:
affinity_ok = (idxaff==SQLITE_AFF_TEXT);
break;
default:
affinity_ok = sqlite3IsNumericAffinity(idxaff);
}
}
/* The collation sequence used by the comparison. If an index is to
|
> | | > | > > > > > > | |
2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 |
/* This function is only called from two places. In both cases the vdbe
** has already been allocated. So assume sqlite3GetVdbe() is always
** successful here.
*/
assert(v);
if( nExpr==1 && pEList->a[0].pExpr->iColumn<0 ){
/* The "x IN (SELECT rowid FROM table)" case */
int iAddr = sqlite3CodeOnce(pParse);
VdbeCoverage(v);
sqlite3OpenTable(pParse, iTab, iDb, pTab, OP_OpenRead);
eType = IN_INDEX_ROWID;
sqlite3VdbeJumpHere(v, iAddr);
}else{
Index *pIdx; /* Iterator variable */
int affinity_ok = 1;
int i;
/* Check that the affinity that will be used to perform each
** comparison is the same as the affinity of each column in table
** on the RHS of the IN operator. If it not, it is not possible to
** use any index of the RHS table. */
for(i=0; i<nExpr && affinity_ok; i++){
Expr *pLhs = sqlite3VectorFieldSubexpr(pX->pLeft, i);
int iCol = pEList->a[i].pExpr->iColumn;
char idxaff = pTab->aCol[iCol].affinity; /* RHS table affinity */
char cmpaff = sqlite3CompareAffinity(pLhs, idxaff);
testcase( cmpaff==SQLITE_AFF_BLOB );
testcase( cmpaff==SQLITE_AFF_TEXT );
switch( cmpaff ){
case SQLITE_AFF_BLOB:
break;
case SQLITE_AFF_TEXT:
/* sqlite3CompareAffinity() only returns TEXT if one side or the
** other has no affinity and the other side is TEXT. Hence,
** the only way for cmpaff to be TEXT is for idxaff to be TEXT
** and for the term on the LHS of the IN to have no affinity. */
assert( idxaff==SQLITE_AFF_TEXT );
break;
default:
affinity_ok = sqlite3IsNumericAffinity(idxaff);
}
}
/* The collation sequence used by the comparison. If an index is to
|