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Improvements to the data-structure explain subsystem. Most queries now

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give a reasonably detailed graph of their parse tree.

FossilOrigin-Name: 0aa7d3d2346bdddcc4e1e25ee26d13c8594885e5
This commit is contained in:
drh
2011-12-07 01:23:51 +00:00
parent 7e02e5e6b5
commit a84203a074
4 changed files with 287 additions and 49 deletions
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54
src/select.c
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@@ -4498,47 +4498,43 @@ select_end:
/*
** Generate a human-readable description of a the Select object.
*/
void sqlite3ExplainSelect(Vdbe *pVdbe, Select *p){
if( p==0 ){
sqlite3ExplainPrintf(pVdbe, "(empty-select)");
return;
}
static void explainOneSelect(Vdbe *pVdbe, Select *p){
sqlite3ExplainPrintf(pVdbe, "SELECT ");
sqlite3ExplainPush(pVdbe);
sqlite3ExplainExprList(pVdbe, p->pEList);
sqlite3ExplainNL(pVdbe);
sqlite3ExplainPop(pVdbe);
if( p->pSrc && p->pSrc->nSrc ){
int i;
sqlite3ExplainPrintf(pVdbe, " FROM ");
sqlite3ExplainPrintf(pVdbe, "FROM ");
sqlite3ExplainPush(pVdbe);
for(i=0; i<p->pSrc->nSrc; i++){
struct SrcList_item *pItem = &p->pSrc->a[i];
sqlite3ExplainPrintf(pVdbe, "%02d: ", i);
sqlite3ExplainPush(pVdbe);
sqlite3ExplainPrintf(pVdbe, "src[%d] = ", i);
if( pItem->pSelect ){
sqlite3ExplainSelect(pVdbe, pItem->pSelect);
}else if( pItem->zName ){
sqlite3ExplainPrintf(pVdbe, "%s", pItem->zName);
}
if( pItem->pTab ){
sqlite3ExplainPrintf(pVdbe, " (table: %s)", pItem->pTab->zName);
sqlite3ExplainPrintf(pVdbe, " (name=%s:%d)",
pItem->pTab->zName, pItem->iCursor);
}
if( pItem->jointype & JT_LEFT ){
sqlite3ExplainPrintf(pVdbe, " LEFT-JOIN");
}
if( pItem->zAlias ){
sqlite3ExplainPrintf(pVdbe, " (AS %s)", pItem->zAlias);
}
sqlite3ExplainNL(pVdbe);
sqlite3ExplainPop(pVdbe);
}
sqlite3ExplainPop(pVdbe);
}
if( p->pWhere ){
sqlite3ExplainPrintf(pVdbe, " WHERE ");
sqlite3ExplainPrintf(pVdbe, "WHERE ");
sqlite3ExplainExpr(pVdbe, p->pWhere);
sqlite3ExplainNL(pVdbe);
}
if( p->pGroupBy ){
sqlite3ExplainPrintf(pVdbe, " GROUP BY ");
sqlite3ExplainPrintf(pVdbe, "GROUPBY ");
sqlite3ExplainExprList(pVdbe, p->pGroupBy);
sqlite3ExplainNL(pVdbe);
}
@@ -4548,11 +4544,37 @@ void sqlite3ExplainSelect(Vdbe *pVdbe, Select *p){
sqlite3ExplainNL(pVdbe);
}
if( p->pOrderBy ){
sqlite3ExplainPrintf(pVdbe, " ORDER BY ");
sqlite3ExplainPrintf(pVdbe, "ORDERBY ");
sqlite3ExplainExprList(pVdbe, p->pOrderBy);
sqlite3ExplainNL(pVdbe);
}
sqlite3ExplainPrintf(pVdbe, " END");
if( p->pLimit ){
sqlite3ExplainPrintf(pVdbe, "LIMIT ");
sqlite3ExplainExpr(pVdbe, p->pLimit);
sqlite3ExplainNL(pVdbe);
}
if( p->pOffset ){
sqlite3ExplainPrintf(pVdbe, "OFFSET ");
sqlite3ExplainExpr(pVdbe, p->pOffset);
sqlite3ExplainNL(pVdbe);
}
}
void sqlite3ExplainSelect(Vdbe *pVdbe, Select *p){
if( p==0 ){
sqlite3ExplainPrintf(pVdbe, "(null-select)");
return;
}
while( p->pPrior ) p = p->pPrior;
sqlite3ExplainPush(pVdbe);
while( p ){
explainOneSelect(pVdbe, p);
p = p->pNext;
if( p==0 ) break;
sqlite3ExplainNL(pVdbe);
sqlite3ExplainPrintf(pVdbe, "%s\n", selectOpName(p->op));
}
sqlite3ExplainPrintf(pVdbe, "END");
sqlite3ExplainPop(pVdbe);
}
/* End of the structure debug printing code