Implementation of WL#2486 -

"Process NATURAL and USING joins according to SQL:2003".

* Some of the main problems fixed by the patch:
  - in "select *" queries the * expanded correctly according to
    ANSI for arbitrary natural/using joins
  - natural/using joins are correctly transformed into JOIN ... ON
    for any number/nesting of the joins.
  - column references are correctly resolved against natural joins
    of any nesting and combined with arbitrary other joins.

* This patch also contains a fix for name resolution of items
  inside the ON condition of JOIN ... ON - in this case items must
  be resolved only against the JOIN operands. To support such
  'local' name resolution, the patch introduces a stack of
  name resolution contexts used at parse time.

NOTICE:
- This patch is not complete in the sense that
  - there are 2 test cases that still do not pass -
    one in join.test, one in select.test. Both are marked
    with a comment "TODO: WL#2486".
  - it does not include a new test specific for the task

1 files changed, 2 insertions, 2 deletions

diff --git a/mysql-test/r/insert_select.result b/mysql-test/r/insert_select.result
index f745af182eb..17f65d96abc 100644
--- a/mysql-test/r/insert_select.result
+++ b/mysql-test/r/insert_select.result
@@ -664,7 +664,7 @@ insert into t1 select t2.a from t2 group by t2.a on duplicate key update a= a +
 insert into t1 select t2.a from t2 on duplicate key update a= a + t2.b;
 ERROR 23000: Column 'a' in field list is ambiguous
 insert into t1 select t2.a from t2 on duplicate key update t2.a= a + t2.b;
-ERROR 42S02: Unknown table 't2' in field list
+ERROR 42S22: Unknown column 't2.a' in 'field list'
 insert into t1 select t2.a from t2 group by t2.a on duplicate key update a= t1.a + t2.b;
-ERROR 42S02: Unknown table 't2' in field list
+ERROR 42S22: Unknown column 't2.b' in 'field list'
 drop table t1,t2,t3;