1 files changed, 21 insertions, 0 deletions
diff --git a/src/resolve.c b/src/resolve.c
index 4090bdd6e..40aab3fac 100644
--- a/src/resolve.c
+++ b/src/resolve.c
@@ -395,6 +395,27 @@ lookupname_end:
 }
 
 /*
+** Allocate and return a pointer to an expression to load the column iCol
+** from datasource iSrc datasource in SrcList pSrc.
+*/
+Expr *sqlite3CreateColumnExpr(sqlite3 *db, SrcList *pSrc, int iSrc, int iCol){
+  Expr *p = sqlite3ExprAlloc(db, TK_COLUMN, 0, 0);
+  if( p ){
+    struct SrcList_item *pItem = &pSrc->a[iSrc];
+    p->pTab = pItem->pTab;
+    p->iTable = pItem->iCursor;
+    if( p->pTab->iPKey==iCol ){
+      p->iColumn = -1;
+    }else{
+      p->iColumn = iCol;
+      pItem->colUsed |= ((Bitmask)1)<<(iCol>=BMS ? BMS-1 : iCol);
+    }
+    ExprSetProperty(p, EP_Resolved);
+  }
+  return p;
+}
+
+/*
 ** This routine is callback for sqlite3WalkExpr().
 **
 ** Resolve symbolic names into TK_COLUMN operators for the current