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Add initial infrastructure for cursors. In where.c, optimize out clauses

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of the form "ORDER BY rowid" if a table scan is being performed.  Do a
reverse table scan if "ORDER BY rowid DESC" is present. (CVS 2141)

FossilOrigin-Name: fc8c1393c86017a816beb52725b68af3b973f979
This commit is contained in:
drh
2004-11-22 19:12:19 +00:00
parent 8237d45ed8
commit b6c29897eb
17 changed files with 671 additions and 93 deletions
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9
src/main.c
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@@ -14,7 +14,7 @@
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.267 2004/11/22 05:26:27 danielk1977 Exp $
** $Id: main.c,v 1.268 2004/11/22 19:12:20 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
@@ -500,6 +500,13 @@ int sqlite3_close(sqlite3 *db){
sqlite3ValueFree(db->pErr);
}
#ifndef SQLITE_OMIT_CURSOR
for(j=0; j<db->nSqlCursor; j++){
sqlite3CursorDelete(db->apSqlCursor[j]);
}
sqliteFree(db->apSqlCursor);
#endif
db->magic = SQLITE_MAGIC_ERROR;
sqliteFree(db);
return SQLITE_OK;