Merge remote-tracking branch 'origin/10.4' into 10.5

1 files changed, 24 insertions, 0 deletions

diff --git a/sql/table.h b/sql/table.h
index b256df25a80..2b866159fe0 100644
--- a/sql/table.h
+++ b/sql/table.h
@@ -59,6 +59,7 @@ class SEQUENCE;
 class Range_rowid_filter_cost_info;
 class derived_handler;
 class Pushdown_derived;
+struct Name_resolution_context;
 
 /*
   Used to identify NESTED_JOIN structures within a join (applicable only to
@@ -2009,6 +2010,7 @@ struct TABLE_LIST
   LEX_CSTRING   alias;
   const char    *option;                /* Used by cache index  */
   Item		*on_expr;		/* Used with outer join */
+  Name_resolution_context *on_context;  /* For ON expressions */
 
   Item          *sj_on_expr;
   /*
@@ -2770,9 +2772,31 @@ public:
 };
 
 
+#define JOIN_OP_NEST       1
+#define REBALANCED_NEST    2
+
 typedef struct st_nested_join
 {
   List<TABLE_LIST>  join_list;       /* list of elements in the nested join */
+  /*
+    Currently the valid values for nest type are:
+    JOIN_OP_NEST - for nest created for JOIN operation used as an operand in
+    a join expression, contains 2 elements;
+    JOIN_OP_NEST | REBALANCED_NEST -  nest created after tree re-balancing
+    in st_select_lex::add_cross_joined_table(), contains 1 element;
+    0 - for all other nests.
+    Examples:
+    1.  SELECT * FROM t1 JOIN t2 LEFT JOIN t3 ON t2.a=t3.a;
+    Here the nest created for LEFT JOIN at first has nest_type==JOIN_OP_NEST.
+    After re-balancing in st_select_lex::add_cross_joined_table() this nest
+    has nest_type==JOIN_OP_NEST | REBALANCED_NEST. The nest for JOIN created
+    in st_select_lex::add_cross_joined_table() has nest_type== JOIN_OP_NEST.
+    2.  SELECT * FROM t1 JOIN (t2 LEFT JOIN t3 ON t2.a=t3.a)
+    Here the nest created for LEFT JOIN has nest_type==0, because it's not
+    an operand in a join expression. The nest created for JOIN has nest_type
+    set to JOIN_OP_NEST.
+  */
+  uint nest_type;
   /* 
     Bitmap of tables within this nested join (including those embedded within
     its children), including tables removed by table elimination.