Changed database, tablename and alias to be LEX_CSTRING

This was done in, among other things:
- thd->db and thd->db_length
- TABLE_LIST tablename, db, alias and schema_name
- Audit plugin database name
- lex->db
- All db and table names in Alter_table_ctx
- st_select_lex db

Other things:
- Changed a lot of functions to take const LEX_CSTRING* as argument
  for db, table_name and alias. See init_one_table() as an example.
- Changed some function arguments from LEX_CSTRING to const LEX_CSTRING
- Changed some lists from LEX_STRING to LEX_CSTRING
- threads_mysql.result changed because process list_db wasn't always
  correctly updated
- New append_identifier() function that takes LEX_CSTRING* as arguments
- Added new element tmp_buff to Alter_table_ctx to separate temp name
  handling from temporary space
- Ensure we store the length after my_casedn_str() of table/db names
- Removed not used version of rename_table_in_stat_tables()
- Changed Natural_join_column::table_name and db_name() to never return
  NULL (used for print)
- thd->get_db() now returns db as a printable string (thd->db.str or "")

1 files changed, 2 insertions, 2 deletions

diff --git a/sql/rpl_filter.cc b/sql/rpl_filter.cc
index d09b7aee31c..3fda2761430 100644
--- a/sql/rpl_filter.cc
+++ b/sql/rpl_filter.cc
@@ -105,9 +105,9 @@ Rpl_filter::tables_ok(const char* db, TABLE_LIST* tables)
     if (!tables->updating) 
       continue;
     some_tables_updating= 1;
-    end= strmov(hash_key, tables->db ? tables->db : db);
+    end= strmov(hash_key, tables->db.str ? tables->db.str : db);
     *end++= '.';
-    len= (uint) (strmov(end, tables->table_name) - hash_key);
+    len= (uint) (strmov(end, tables->table_name.str) - hash_key);
     if (do_table_inited) // if there are any do's
     {
       if (my_hash_search(&do_table, (uchar*) hash_key, len))