Fixing compilation failure on Windows: moving references to type_handler_xxx...

Fixing compilation failure on Windows: moving references to type_handler_xxx from field.h to field.cc

sql/field.cc

@@ -8176,6 +8176,22 @@ void Field_blob::sort_string(uchar *to,uint length)
 }
 
 
+/*
+  Return the data type handler, according to packlength.
+  Implemented in field.cc rather than in field.h
+  to avoid exporting type_handler_xxx with MYSQL_PLUGIN_IMPORT.
+*/
+const Type_handler *Field_blob::type_handler() const
+{
+  switch (packlength) {
+  case 1: return &type_handler_tiny_blob;
+  case 2: return &type_handler_blob;
+  case 3: return &type_handler_medium_blob;
+  }
+  return &type_handler_long_blob;
+}
+
+
 void Field_blob::sql_type(String &res) const
 {
   const char *str;

sql/field.h

@@ -3238,15 +3238,7 @@ class Field_blob :public Field_longstr {
     :Field_longstr((uchar*) 0, 0, (uchar*) "", 0, NONE, &temp_lex_str,
                    system_charset_info),
     packlength(packlength_arg) {}
-  const Type_handler *type_handler() const
-  {
-    switch (packlength) {
-    case 1: return &type_handler_tiny_blob;
-    case 2: return &type_handler_blob;
-    case 3: return &type_handler_medium_blob;
-    }
-    return &type_handler_long_blob;
-  }
+  const Type_handler *type_handler() const;
   /* Note that the default copy constructor is used, in clone() */
   enum_field_types type() const
   {