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Avoid duplicate OP_Column opcodes by remembering prior results.

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This is similar to CSE, but only applies to columns. (CVS 4943)

FossilOrigin-Name: c29ee0fed23dcdbd9dde6b1e42b603100ea2389c
This commit is contained in:
drh
2008-03-31 23:48:03 +00:00
parent 678ccce8b3
commit e55cbd7228
9 changed files with 209 additions and 47 deletions
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3
src/update.c
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@@ -12,7 +12,7 @@
** This file contains C code routines that are called by the parser
** to handle UPDATE statements.
**
** $Id: update.c,v 1.173 2008/03/25 09:47:35 danielk1977 Exp $
** $Id: update.c,v 1.174 2008/03/31 23:48:05 drh Exp $
*/
#include "sqliteInt.h"
@@ -446,6 +446,7 @@ void sqlite3Update(
sqlite3VdbeAddOp3(v, OP_MakeRecord, regCols, pTab->nCol, regRow);
if( !isView ){
sqlite3TableAffinityStr(v, pTab);
sqlite3ExprExpireColumnCacheLines(pParse, regCols, regCols+pTab->nCol-1);
}
sqlite3ReleaseTempRange(pParse, regCols, pTab->nCol);
if( pParse->nErr ) goto update_cleanup;