- Modifies the way indexed UPDATE/DELETE are sorted in order to execute

them sorted by file position. Firstly a new value is stored in indexes
  to know if they are sorted, preventing to do the sorting when it is not
  needed. Secondly, almost all in now done in connect instead of being
  done by the different file access method classes. This pepares the future
  use of temporary files for all table types and also fix the bug that was
  occuring when partially using a multi-column index because of false MRR
  like call of position followed by unsorted rnd_pos no more using indexing.
modified:
  storage/connect/connect.cc
  storage/connect/filamap.cpp
  storage/connect/filamap.h
  storage/connect/filamdbf.cpp
  storage/connect/filamdbf.h
  storage/connect/filamfix.cpp
  storage/connect/filamfix.h
  storage/connect/filamtxt.cpp
  storage/connect/filamtxt.h
  storage/connect/filamvct.cpp
  storage/connect/filamvct.h
  storage/connect/tabdos.cpp
  storage/connect/tabdos.h
  storage/connect/tabfix.h
  storage/connect/tabfmt.cpp
  storage/connect/tabfmt.h
  storage/connect/xindex.cpp
  storage/connect/xindex.h
  storage/connect/xtable.h

storage/connect/tabfmt.cpp

@@ -899,9 +899,9 @@ int TDBCSV::ReadBuffer(PGLOBAL g)
   } // end of ReadBuffer
 
 /***********************************************************************/
-/*  Data Base write routine CSV file access method.                    */
+/*  Prepare the line to write.                                         */
 /***********************************************************************/
-int TDBCSV::WriteDB(PGLOBAL g)
+bool TDBCSV::PrepareWriting(PGLOBAL g)
   {
   char sep[2], qot[2];
   int  i, nlen, oldlen = strlen(To_Line);
@@ -912,7 +912,7 @@ int TDBCSV::WriteDB(PGLOBAL g)
 
   // Before writing the line we must check its length
   if ((nlen = CheckWrite(g)) < 0)
-    return RC_FX;
+    return true;
 
   // Before writing the line we must make it
   sep[0] = Sep;
@@ -975,6 +975,18 @@ int TDBCSV::WriteDB(PGLOBAL g)
   if (trace > 1)
     htrc("Write: line is=%s", To_Line);
 
+  return false;
+  } // end of PrepareWriting
+
+/***********************************************************************/
+/*  Data Base write routine CSV file access method.                    */
+/***********************************************************************/
+int TDBCSV::WriteDB(PGLOBAL g)
+  {
+  // Before writing the line we must check and prepare it
+  if (PrepareWriting(g))
+    return RC_FX;
+
   /*********************************************************************/
   /*  Now start the writing process.                                   */
   /*********************************************************************/