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Coverage improvements for where.c. (CVS 3764)

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FossilOrigin-Name: 7e0aa964129612e2bad6fa45139d124f19cacd48
This commit is contained in:
danielk1977
2007-03-30 14:56:34 +00:00
parent 3cdd7d37c6
commit 780b1d9416
6 changed files with 87 additions and 31 deletions
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39
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 1.44 2007/01/03 23:37:29 drh Exp $
** $Id: test8.c,v 1.45 2007/03/30 14:56:35 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
@@ -27,12 +27,13 @@ typedef struct echo_vtab echo_vtab;
typedef struct echo_cursor echo_cursor;
/*
** The test module defined in this file uses two global Tcl variables to
** The test module defined in this file uses four global Tcl variables to
** commicate with test-scripts:
**
** $::echo_module
** $::echo_module_sync_fail
** $::echo_module_begin_fail
** $::echo_module_cost
**
** The variable ::echo_module is a list. Each time one of the following
** methods is called, one or more elements are appended to the list.
@@ -627,27 +628,35 @@ static int echoBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
const char *zSep = "WHERE";
echo_vtab *pVtab = (echo_vtab *)tab;
sqlite3_stmt *pStmt = 0;
Tcl_Interp *interp = pVtab->interp;
int nRow;
int useIdx = 0;
int rc = SQLITE_OK;
int useCost = 0;
double cost;
/* 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
** number of rows if the proposed scan uses an index.
*/
zQuery = sqlite3_mprintf("SELECT count(*) FROM %Q", pVtab->zTableName);
rc = sqlite3_prepare(pVtab->db, zQuery, -1, &pStmt, 0);
sqlite3_free(zQuery);
if( rc!=SQLITE_OK ){
return rc;
}
sqlite3_step(pStmt);
nRow = sqlite3_column_int(pStmt, 0);
rc = sqlite3_finalize(pStmt);
if( rc!=SQLITE_OK ){
return rc;
if( Tcl_GetVar(interp, "echo_module_cost", TCL_GLOBAL_ONLY) ){
cost = atof(Tcl_GetVar(interp, "echo_module_cost", TCL_GLOBAL_ONLY));
useCost = 1;
} else {
zQuery = sqlite3_mprintf("SELECT count(*) FROM %Q", pVtab->zTableName);
rc = sqlite3_prepare(pVtab->db, zQuery, -1, &pStmt, 0);
sqlite3_free(zQuery);
if( rc!=SQLITE_OK ){
return rc;
}
sqlite3_step(pStmt);
nRow = sqlite3_column_int(pStmt, 0);
rc = sqlite3_finalize(pStmt);
if( rc!=SQLITE_OK ){
return rc;
}
}
zQuery = sqlite3_mprintf("SELECT rowid, * FROM %Q", pVtab->zTableName);
@@ -717,7 +726,9 @@ static int echoBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
pIdxInfo->idxNum = hashString(zQuery);
pIdxInfo->idxStr = zQuery;
pIdxInfo->needToFreeIdxStr = 1;
if( useIdx ){
if (useCost) {
pIdxInfo->estimatedCost = cost;
} else if( useIdx ){
/* Approximation of log2(nRow). */
for( ii=0; ii<(sizeof(int)*8); ii++ ){
if( nRow & (1<<ii) ){