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Add the experimental EXPLAIN QUERY PLAN diagnostic capability. (CVS 2685)

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FossilOrigin-Name: 986efb7b12643800805ad4b1f1e90e30fcf6d38a
This commit is contained in:
drh
2005-09-10 16:46:12 +00:00
parent d891967052
commit ecc9242f6f
8 changed files with 59 additions and 27 deletions
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16
src/where.c
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@@ -16,7 +16,7 @@
** so is applicable. Because this module is responsible for selecting
** indices, you might also think of this module as the "query optimizer".
**
** $Id: where.c,v 1.170 2005/09/10 15:28:09 drh Exp $
** $Id: where.c,v 1.171 2005/09/10 16:46:13 drh Exp $
*/
#include "sqliteInt.h"
@@ -1499,6 +1499,20 @@ WhereInfo *sqlite3WhereBegin(
Index *pIx;
int iIdxCur = pLevel->iIdxCur;
#ifndef SQLITE_OMIT_EXPLAIN
if( pParse->explain==2 ){
char *zMsg;
struct SrcList_item *pItem = &pTabList->a[pLevel->iFrom];
zMsg = sqlite3MPrintf("TABLE %s", pItem->zName);
if( pItem->zAlias ){
zMsg = sqlite3MPrintf("%z AS %s", zMsg, pItem->zAlias);
}
if( (pIx = pLevel->pIdx)!=0 ){
zMsg = sqlite3MPrintf("%z WITH INDEX %s", zMsg, pIx->zName);
}
sqlite3VdbeOp3(v, OP_Explain, i, pLevel->iFrom, zMsg, P3_DYNAMIC);
}
#endif /* SQLITE_OMIT_EXPLAIN */
pTabItem = &pTabList->a[pLevel->iFrom];
pTab = pTabItem->pTab;
if( pTab->isTransient || pTab->pSelect ) continue;