Change the name of the Expr.a.zName field to zEName, so that it has a name
that is distinct from other fields and variables and is hence easier to
grep for.

FossilOrigin-Name: d3783357f8fa76c42a86f12b214522f0388c37773c36ab8c5ce0623abbc4436a
diff --git a/src/expr.c b/src/expr.c
index 3b2b513..f9c57ba 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1436,7 +1436,7 @@
         pNewExpr->pLeft = pPriorSelectCol;
       }
     }
-    pItem->zName = sqlite3DbStrDup(db, pOldItem->zName);
+    pItem->zEName = sqlite3DbStrDup(db, pOldItem->zEName);
     pItem->zSpan = sqlite3DbStrDup(db, pOldItem->zSpan);
     pItem->sortFlags = pOldItem->sortFlags;
     pItem->done = 0;
@@ -1608,9 +1608,9 @@
     pList = pNew;
   }
   pItem = &pList->a[pList->nExpr++];
-  assert( offsetof(struct ExprList_item,zName)==sizeof(pItem->pExpr) );
+  assert( offsetof(struct ExprList_item,zEName)==sizeof(pItem->pExpr) );
   assert( offsetof(struct ExprList_item,pExpr)==0 );
-  memset(&pItem->zName,0,sizeof(*pItem)-offsetof(struct ExprList_item,zName));
+  memset(&pItem->zEName,0,sizeof(*pItem)-offsetof(struct ExprList_item,zEName));
   pItem->pExpr = pExpr;
   return pList;
 
@@ -1667,7 +1667,7 @@
     pList = sqlite3ExprListAppend(pParse, pList, pSubExpr);
     if( pList ){
       assert( pList->nExpr==iFirst+i+1 );
-      pList->a[pList->nExpr-1].zName = pColumns->a[i].zName;
+      pList->a[pList->nExpr-1].zEName = pColumns->a[i].zName;
       pColumns->a[i].zName = 0;
     }
   }
@@ -1727,7 +1727,7 @@
 }
 
 /*
-** Set the ExprList.a[].zName element of the most recently added item
+** Set the ExprList.a[].zEName element of the most recently added item
 ** on the expression list.
 **
 ** pList might be NULL following an OOM error.  But pName should never be
@@ -1745,11 +1745,11 @@
     struct ExprList_item *pItem;
     assert( pList->nExpr>0 );
     pItem = &pList->a[pList->nExpr-1];
-    assert( pItem->zName==0 );
-    pItem->zName = sqlite3DbStrNDup(pParse->db, pName->z, pName->n);
-    if( dequote ) sqlite3Dequote(pItem->zName);
+    assert( pItem->zEName==0 );
+    pItem->zEName = sqlite3DbStrNDup(pParse->db, pName->z, pName->n);
+    if( dequote ) sqlite3Dequote(pItem->zEName);
     if( IN_RENAME_OBJECT ){
-      sqlite3RenameTokenMap(pParse, (void*)pItem->zName, pName);
+      sqlite3RenameTokenMap(pParse, (void*)pItem->zEName, pName);
     }
   }
 }
@@ -1804,7 +1804,7 @@
   assert( pList->nExpr>0 );
   do{
     sqlite3ExprDelete(db, pItem->pExpr);
-    sqlite3DbFree(db, pItem->zName);
+    sqlite3DbFree(db, pItem->zEName);
     sqlite3DbFree(db, pItem->zSpan);
     pItem++;
   }while( --i>0 );