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More wheretrace debugging support: Show a listing of all WHERE clause

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terms (on wheretrace bit 0x100) and include important flags such as
TERM_VIRTUAL, WO_EQUIV, and EP_FromJoin.

FossilOrigin-Name: 92ccd705411ce3f64720ab5f34c7efc9cb46d5c9
This commit is contained in:
drh
2013-10-28 19:59:59 +00:00
parent c1ba2e7a52
commit f4e9cb065b
3 changed files with 44 additions and 11 deletions
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41
src/where.c
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@@ -3889,6 +3889,25 @@ static Bitmask codeOneLoopStart(
return pLevel->notReady;
}
#if defined(WHERETRACE_ENABLED) && defined(SQLITE_ENABLE_TREE_EXPLAIN)
/*
** Generate "Explanation" text for a WhereTerm.
*/
static void whereExplainTerm(Vdbe *v, WhereTerm *pTerm){
char zType[4];
memcpy(zType, "...", 4);
if( pTerm->wtFlags & TERM_VIRTUAL ) zType[0] = 'V';
if( pTerm->eOperator & WO_EQUIV ) zType[1] = 'E';
if( ExprHasProperty(pTerm->pExpr, EP_FromJoin) ) zType[2] = 'L';
sqlite3ExplainPrintf(v, "%s ", zType);
if( (pTerm->wtFlags & (TERM_ORINFO|TERM_ANDINFO))==0 ){
sqlite3ExplainPrintf(v, "lhs=%-2d ", pTerm->u.leftColumn);
}
sqlite3ExplainExpr(v, pTerm->pExpr);
}
#endif /* WHERETRACE_ENABLED && SQLITE_ENABLE_TREE_EXPLAIN */
#ifdef WHERETRACE_ENABLED
/*
** Print a WhereLoop object for debugging purposes
@@ -3938,11 +3957,8 @@ static void whereLoopPrint(WhereLoop *p, WhereClause *pWC){
for(i=0; i<p->nLTerm; i++){
WhereTerm *pTerm = p->aLTerm[i];
sqlite3ExplainPrintf(v, " (%d) #%d ", i+1, (int)(pTerm-pWC->a));
if( (pTerm->wtFlags & (TERM_ORINFO|TERM_ANDINFO))==0 ){
sqlite3ExplainPrintf(v, "lhs=%-2d ", pTerm->u.leftColumn);
}
sqlite3ExplainPush(v);
sqlite3ExplainExpr(v, pTerm->pExpr);
whereExplainTerm(v, pTerm);
sqlite3ExplainPop(v);
sqlite3ExplainNL(v);
}
@@ -5839,6 +5855,23 @@ WhereInfo *sqlite3WhereBegin(
/* Construct the WhereLoop objects */
WHERETRACE(0xffff,("*** Optimizer Start ***\n"));
/* Display all terms of the WHERE clause */
#if defined(WHERETRACE_ENABLED) && defined(SQLITE_ENABLE_TREE_EXPLAIN)
if( sqlite3WhereTrace & 0x100 ){
int i;
Vdbe *v = pParse->pVdbe;
sqlite3ExplainBegin(v);
for(i=0; i<sWLB.pWC->nTerm; i++){
sqlite3ExplainPrintf(v, "#%d ", i);
sqlite3ExplainPush(v);
whereExplainTerm(v, &sWLB.pWC->a[i]);
sqlite3ExplainPop(v);
sqlite3ExplainNL(v);
}
sqlite3ExplainFinish(v);
sqlite3DebugPrintf("%s", sqlite3VdbeExplanation(v));
}
#endif
if( nTabList!=1 || whereShortCut(&sWLB)==0 ){
rc = whereLoopAddAll(&sWLB);
if( rc ) goto whereBeginError;