41     Walker w;  in incrAggFunctionDepth()  local
42     memset(&w, 0, sizeof(w));  in incrAggFunctionDepth()
43     w.xExprCallback = incrAggDepth;  in incrAggFunctionDepth()
44     w.u.n = N;  in incrAggFunctionDepth()
45     sqlite3WalkExpr(&w, pExpr);  in incrAggFunctionDepth()
1978   Walker w;  in sqlite3ResolveExprNames()  local
1983   w.pParse = pNC->pParse;  in sqlite3ResolveExprNames()
1984   w.xExprCallback = resolveExprStep;  in sqlite3ResolveExprNames()
1985   w.xSelectCallback = (pNC->ncFlags & NC_NoSelect) ? 0 : resolveSelectStep;  in sqlite3ResolveExprNames()
1986   w.xSelectCallback2 = 0;  in sqlite3ResolveExprNames()
1987   w.u.pNC = pNC;  in sqlite3ResolveExprNames()
1989   w.pParse->nHeight += pExpr->nHeight;  in sqlite3ResolveExprNames()
1990   if( sqlite3ExprCheckHeight(w.pParse, w.pParse->nHeight) ){  in sqlite3ResolveExprNames()
1994   sqlite3WalkExpr(&w, pExpr);  in sqlite3ResolveExprNames()
1996   w.pParse->nHeight -= pExpr->nHeight;  in sqlite3ResolveExprNames()
2004   return pNC->nNcErr>0 || w.pParse->nErr>0;  in sqlite3ResolveExprNames()
2018   Walker w;  in sqlite3ResolveExprListNames()  local
2020   w.pParse = pNC->pParse;  in sqlite3ResolveExprListNames()
2021   w.xExprCallback = resolveExprStep;  in sqlite3ResolveExprListNames()
2022   w.xSelectCallback = resolveSelectStep;  in sqlite3ResolveExprListNames()
2023   w.xSelectCallback2 = 0;  in sqlite3ResolveExprListNames()
2024   w.u.pNC = pNC;  in sqlite3ResolveExprListNames()
2031     w.pParse->nHeight += pExpr->nHeight;  in sqlite3ResolveExprListNames()
2032     if( sqlite3ExprCheckHeight(w.pParse, w.pParse->nHeight) ){  in sqlite3ResolveExprListNames()
2036     sqlite3WalkExpr(&w, pExpr);  in sqlite3ResolveExprListNames()
2038     w.pParse->nHeight -= pExpr->nHeight;  in sqlite3ResolveExprListNames()
2050     if( w.pParse->nErr>0 ) return WRC_Abort;  in sqlite3ResolveExprListNames()
2073   Walker w;  in sqlite3ResolveSelectNames()  local
2076   w.xExprCallback = resolveExprStep;  in sqlite3ResolveSelectNames()
2077   w.xSelectCallback = resolveSelectStep;  in sqlite3ResolveSelectNames()
2078   w.xSelectCallback2 = 0;  in sqlite3ResolveSelectNames()
2079   w.pParse = pParse;  in sqlite3ResolveSelectNames()
2080   w.u.pNC = pOuterNC;  in sqlite3ResolveSelectNames()
2081   sqlite3WalkSelect(&w, p);  in sqlite3ResolveSelectNames()