Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
| Comment: | Improved header comment and precondition checking for the new isDupColumn() function. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | tkt-3182d38790 |
| Files: | files | file ages | folders |
| SHA3-256: |
740d5ff6cc9bf7b151dfb8b27409e592 |
| User & Date: | drh 2019-04-29 13:30:16 |
Context
|
2019-04-29
| ||
| 13:48 | Do not de-duplicate columns index columns associated with a WITHOUT ROWID table if the columns have different collating sequences. This is the fix for ticket [3182d3879020ef3b2]. There is one test case added, but most of the tests are done in TH3. check-in: 1b1dd4d4 user: drh tags: trunk | |
| 13:30 | Improved header comment and precondition checking for the new isDupColumn() function. Closed-Leaf check-in: 740d5ff6 user: drh tags: tkt-3182d38790 | |
|
2019-04-28
| ||
| 19:27 | Take collating sequence into account when removing redundant columns from indexes on WITHOUT ROWID tables. This is the first proof-of-concept fix for ticket [3182d3879020ef3]. More testing needed. check-in: b34fa5bf user: drh tags: tkt-3182d38790 | |
Changes
Changes to src/build.c.
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 |
return 1;
}
}
return 0;
}
/*
** Return true if any of the first nKey entries of index pIdx1 exactly
** match the iCol-th entry of pIdx2.
**
** The first nKey entries of pIdx1 are guaranteed to be ordinary columns,
** not a rowid or expression.
**
** This routine differs from hasColumn() in that both the column and the
** collating sequence must match for this routine, but for hasColumn() only
** the column name must match.
*/
static int isDupColumn(Index *pIdx1, int nKey, Index *pIdx2, int iCol){
int i, j;
assert( nKey<=pIdx1->nColumn );
assert( iCol<MAX(pIdx2->nColumn,pIdx2->nKeyCol) );
j = pIdx2->aiColumn[iCol];
testcase( j==XN_EXPR );
assert( j!=XN_ROWID );
for(i=0; i<nKey; i++){
assert( pIdx1->aiColumn[i]>=0 || j>=0 );
if( pIdx1->aiColumn[i]==j
&& sqlite3StrICmp(pIdx1->azColl[i],pIdx2->azColl[iCol])==0
){
return 1;
}
}
return 0;
}
|
| | > > | | | | > > > > | < | | | | |
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 |
return 1;
}
}
return 0;
}
/*
** Return true if any of the first nKey entries of index pIdx exactly
** match the iCol-th entry of pPk. pPk is always a WITHOUT ROWID
** PRIMARY KEY index. pIdx is an index on the same table. pIdx may
** or may not be the same index as pPk.
**
** The first nKey entries of pIdx are guaranteed to be ordinary columns,
** not a rowid or expression.
**
** This routine differs from hasColumn() in that both the column and the
** collating sequence must match for this routine, but for hasColumn() only
** the column name must match.
*/
static int isDupColumn(Index *pIdx, int nKey, Index *pPk, int iCol){
int i, j;
assert( nKey<=pIdx->nColumn );
assert( iCol<MAX(pPk->nColumn,pPk->nKeyCol) );
assert( pPk->idxType==SQLITE_IDXTYPE_PRIMARYKEY );
assert( pPk->pTable->tabFlags & TF_WithoutRowid );
assert( pPk->pTable==pIdx->pTable );
testcase( pPk==pIdx );
j = pPk->aiColumn[iCol];
assert( j!=XN_ROWID && j!=XN_EXPR );
for(i=0; i<nKey; i++){
assert( pIdx->aiColumn[i]>=0 || j>=0 );
if( pIdx->aiColumn[i]==j
&& sqlite3StrICmp(pIdx->azColl[i], pPk->azColl[iCol])==0
){
return 1;
}
}
return 0;
}
|