fix char(0) to use ndb bit format

sql/ha_ndbcluster.cc

@@ -90,7 +90,7 @@ static int ndb_get_table_statistics(Ndb*, const char *,
   Dummy buffer to read zero pack_length fields
   which are mapped to 1 char
 */
-static byte dummy_buf[1];
+static uint32 dummy_buf;
 
 /*
   Error handling functions
@@ -470,11 +470,15 @@ int ha_ndbcluster::set_ndb_value(NdbOperation *ndb_op, Field *field,
   if (ndb_supported_type(field->type()))
   {
     // ndb currently does not support size 0
-    const byte *empty_field= "";
+    uint32 empty_field;
     if (pack_len == 0)
     {
-      pack_len= 1;
-      field_ptr= empty_field;
+      pack_len= sizeof(empty_field);
+      field_ptr= (byte *)&empty_field;
+      if (field->is_null())
+	empty_field= 0;
+      else
+	empty_field= 1;
     }
     if (! (field->flags & BLOB_FLAG))
     {
@@ -623,7 +627,7 @@ int ha_ndbcluster::get_ndb_value(NdbOperation *ndb_op, Field *field,
 	if (field->pack_length() != 0)
 	  field_buf= buf + (field->ptr - table->record[0]);
 	else
-	  field_buf= dummy_buf;
+	  field_buf= (byte *)&dummy_buf;
         m_value[fieldnr].rec= ndb_op->getValue(fieldnr, 
 					       field_buf);
         DBUG_RETURN(m_value[fieldnr].rec == NULL);
@@ -3329,19 +3333,22 @@ static int create_ndb_column(NDBCOL &col,
     break;
   // Char types
   case MYSQL_TYPE_STRING:      
-    if (field->flags & BINARY_FLAG)
-      col.setType(NDBCOL::Binary);
-    else {
-      col.setType(NDBCOL::Char);
-      col.setCharset(cs);
-    }
     if (field->pack_length() == 0)
     {
       col.setType(NDBCOL::Bit);
       col.setLength(1);
     }
+    else if (field->flags & BINARY_FLAG)
+    {
+      col.setType(NDBCOL::Binary);
+      col.setLength(field->pack_length());
+    }
     else
+    {
+      col.setType(NDBCOL::Char);
+      col.setCharset(cs);
       col.setLength(field->pack_length());
+    }
     break;
   case MYSQL_TYPE_VAR_STRING:
     if (field->flags & BINARY_FLAG)