Prevent a segfault described by ticket #1229. (CVS 2450)

FossilOrigin-Name: 0667eae9a97059125a77bd90452d19dc17c30a12

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 1.244 2005/04/22 02:38:38 drh Exp $
+** $Id: select.c,v 1.245 2005/04/29 02:10:00 drh Exp $
 */
 #include "sqliteInt.h"
 
@@ -689,6 +689,20 @@ static const char *columnType(NameContext *pNC, Expr *pExpr){
           pNC = pNC->pNext;
         }
       }
+      if( pTab==0 ){
+        /* FIX ME:
+        ** This can occurs if you have something like "SELECT new.x;" inside
+        ** a trigger.  In other words, if you reference the special "new"
+        ** table in the result set of a select.  We do not have a good way
+        ** to find the actual table type, so call it "TEXT".  This is really
+        ** something of a bug, but I do not know how to fix it.
+        **
+        ** This code does not produce the correct answer - it just prevents
+        ** a segfault.  See ticket #1229.
+        */
+        zType = "TEXT";
+        break;
+      }
       assert( pTab );
       if( iCol<0 ) iCol = pTab->iPKey;
       assert( iCol==-1 || (iCol>=0 && iCol<pTab->nCol) );