Fix warnings and bug spotted by gcc-4.3.

Related to operator precedence and associativity.
Make the expressions as explicit as possible.

sql/field.h:
  Silence gcc-4.3 warning: be more explicit.
sql/item.cc:
  Silence gcc-4.3 warning: be more explicit.
sql/item_sum.cc:
  Silence gcc-4.3 warning: be more explicit.
sql/log_event.cc:
  Silence gcc-4.3 warning: be more explicit.
sql/spatial.h:
  Silence gcc-4.3 warning: be more explicit.
sql/sql_lex.cc:
  Silence gcc-4.3 warning: be more explicit.
sql/table.h:
  Silence gcc-4.3 warning: be more explicit.
storage/federated/ha_federated.cc:
  Fix operator precedence bug.
storage/heap/ha_heap.cc:
  Silence gcc-4.3 warning: be more explicit.

1 files changed, 1 insertions, 1 deletions

diff --git a/sql/table.h b/sql/table.h
index 8d6473661ac..a6a256b30b6 100644
--- a/sql/table.h
+++ b/sql/table.h
@@ -1363,7 +1363,7 @@ struct TABLE_LIST
   void cleanup_items();
   bool placeholder()
   {
-    return derived || view || schema_table || create && !table->db_stat ||
+    return derived || view || schema_table || (create && !table->db_stat) ||
            !table;
   }
   void print(THD *thd, String *str, enum_query_type query_type);