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Return an error when an xBestIndex() method indicates that it intends to use the value of an unusable constraint. Related to #2998. (CVS 4867)

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FossilOrigin-Name: ffd470279540b1b8e3fdce6eb14001bae489b16d
This commit is contained in:
danielk1977
2008-03-17 09:36:44 +00:00
parent 17fe6c1d32
commit 39359dc020
5 changed files with 148 additions and 14 deletions
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9
src/test8.c
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@@ -13,7 +13,7 @@
** is not included in the SQLite library. It is used for automated
** testing of the SQLite library.
**
** $Id: test8.c,v 1.60 2008/02/13 18:25:27 danielk1977 Exp $
** $Id: test8.c,v 1.61 2008/03/17 09:36:45 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
@@ -730,6 +730,11 @@ static int echoBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
int useCost = 0;
double cost;
int isIgnoreUsable = 0;
if( Tcl_GetVar(interp, "echo_module_ignore_usable", TCL_GLOBAL_ONLY) ){
isIgnoreUsable = 1;
}
/* Determine the number of rows in the table and store this value in local
** variable nRow. The 'estimated-cost' of the scan will be the number of
** rows in the table for a linear scan, or the log (base 2) of the
@@ -768,6 +773,8 @@ static int echoBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
pConstraint = &pIdxInfo->aConstraint[ii];
pUsage = &pIdxInfo->aConstraintUsage[ii];
if( !isIgnoreUsable && !pConstraint->usable ) continue;
iCol = pConstraint->iColumn;
if( pVtab->aIndex[iCol] ){
char *zCol = pVtab->aCol[iCol];