Comment change on the previous check-in. No changes to code. (CVS 4918)

FossilOrigin-Name: 72ae456239eb9f75b744f6733c4441b380bd1be1

src/select.c

@@ -12,7 +12,7 @@
 ** This file contains C code routines that are called by the parser
 ** to handle SELECT statements in SQLite.
 **
-** $Id: select.c,v 1.420 2008/03/26 12:46:24 drh Exp $
+** $Id: select.c,v 1.421 2008/03/26 12:50:15 drh Exp $
 */
 #include "sqliteInt.h"
 
@@ -549,6 +549,9 @@ static void selectInnerLoop(
     pDest->iMem = sqlite3GetTempRange(pParse, nResultCol);
     pDest->nMem = nResultCol;
   }else if( pDest->nMem!=nResultCol ){
+    /* This happens when two SELECTs of a compound SELECT have differing
+    ** numbers of result columns.  The error message will be generated by
+    ** a higher-level routine. */
     return;
   }
   regResult = pDest->iMem;