Fix for bug #29444: crash with partition refering to table in create-select

Problem: creating a partitioned table during name resolution for the 
partition function we search for column names in all parts of the
CREATE TABLE query. It is superfluous (and wrong) sometimes.

Fix: launch name resolution for the partition function against
the table we're creating.


mysql-test/r/partition.result:
  Fix for bug #29444: crash with partition refering to table in create-select
    - test result.
mysql-test/t/partition.test:
  Fix for bug #29444: crash with partition refering to table in create-select
    - test result.
sql/item.cc:
  Fix for bug #29444: crash with partition refering to table in create-select
    - LEX::use_only_table_context introduced, which is used in the 
      Item_field::fix_fields() to resolve names only against
      context->first_name_resolution_table/last_name_resolution_table.
sql/sql_lex.cc:
  Fix for bug #29444: crash with partition refering to table in create-select
    - LEX::use_only_table_context introduced, which is used in the 
      Item_field::fix_fields() to resolve names only against
      context->first_name_resolution_table/last_name_resolution_table.
sql/sql_lex.h:
  Fix for bug #29444: crash with partition refering to table in create-select
    - LEX::use_only_table_context introduced, which is used in the 
      Item_field::fix_fields() to resolve names only against
      context->first_name_resolution_table/last_name_resolution_table.
sql/sql_partition.cc:
  Fix for bug #29444: crash with partition refering to table in create-select
    - set the lex->use_only_table_context before the func_expr->fix_fields()
      call to ensure we're resolving names against the table we're creating;
      then restore it back after the call.

mysql-test/r/partition.result

@@ -1267,4 +1267,24 @@ ALTER TABLE general_log PARTITION BY RANGE (TO_DAYS(event_time))
 ERROR HY000: Incorrect usage of PARTITION and log table
 ALTER TABLE general_log ENGINE = CSV;
 SET GLOBAL general_log = default;
+use test;
+create table t2 (b int);
+create table t1 (b int)
+PARTITION BY RANGE (t2.b) (
+PARTITION p1 VALUES LESS THAN (10),
+PARTITION p2 VALUES LESS THAN (20)
+) select * from t2;
+ERROR 42S22: Unknown column 't2.b' in 'partition function'
+create table t1 (a int)
+PARTITION BY RANGE (b) (
+PARTITION p1 VALUES LESS THAN (10),
+PARTITION p2 VALUES LESS THAN (20)
+) select * from t2;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(11) DEFAULT NULL,
+  `b` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 /*!50100 PARTITION BY RANGE (b) (PARTITION p1 VALUES LESS THAN (10) ENGINE = MyISAM, PARTITION p2 VALUES LESS THAN (20) ENGINE = MyISAM) */
+drop table t1, t2;
 End of 5.1 tests

mysql-test/t/partition.test

@@ -1493,10 +1493,30 @@ ALTER TABLE general_log PARTITION BY RANGE (TO_DAYS(event_time))
   (PARTITION p0 VALUES LESS THAN (733144), PARTITION p1 VALUES LESS THAN (3000000));
 ALTER TABLE general_log ENGINE = CSV;
 SET GLOBAL general_log = default;
+use test;
 
 #
 # Bug #27084 partitioning by list seems failing when using case 
 # BUG #18198: Case no longer supported, test case removed
 #
 
+#
+# Bug #29444: crash with partition refering to table in create-select
+#
+
+create table t2 (b int);
+--error 1054
+create table t1 (b int)
+PARTITION BY RANGE (t2.b) (
+  PARTITION p1 VALUES LESS THAN (10),
+  PARTITION p2 VALUES LESS THAN (20)
+) select * from t2;
+create table t1 (a int)
+PARTITION BY RANGE (b) (
+  PARTITION p1 VALUES LESS THAN (10),
+  PARTITION p2 VALUES LESS THAN (20)
+) select * from t2;
+show create table t1;
+drop table t1, t2;
+
 --echo End of 5.1 tests

sql/item.cc

@@ -3860,7 +3860,9 @@ bool Item_field::fix_fields(THD *thd, Item **reference)
                                           context->first_name_resolution_table,
                                           context->last_name_resolution_table,
                                           reference,
-                                          IGNORE_EXCEPT_NON_UNIQUE,
+                                          thd->lex->use_only_table_context ?
+                                            REPORT_ALL_ERRORS : 
+                                            IGNORE_EXCEPT_NON_UNIQUE,
                                           !any_privileges,
                                           TRUE)) ==
 	not_found_field)

sql/sql_lex.cc

@@ -338,6 +338,7 @@ void lex_start(THD *thd)
   lex->query_tables= 0;
   lex->reset_query_tables_list(FALSE);
   lex->expr_allows_subselect= TRUE;
+  lex->use_only_table_context= FALSE;
 
   lex->name.str= 0;
   lex->name.length= 0;

sql/sql_lex.h

@@ -1693,6 +1693,14 @@ typedef struct st_lex : public Query_tables_list
   */
   const char *fname_start;
   const char *fname_end;
+  
+  /**
+    During name resolution search only in the table list given by 
+    Name_resolution_context::first_name_resolution_table and
+    Name_resolution_context::last_name_resolution_table
+    (see Item_field::fix_fields()). 
+  */
+  bool use_only_table_context;
 
   LEX_STRING view_body_utf8;
 

sql/sql_partition.cc

@@ -902,6 +902,7 @@ bool fix_fields_part_func(THD *thd, Item* func_expr, TABLE *table,
   const char *save_where;
   char* db_name;
   char db_name_string[FN_REFLEN];
+  bool save_use_only_table_context;
   DBUG_ENTER("fix_fields_part_func");
 
   if (part_info->fixed)
@@ -958,8 +959,14 @@ bool fix_fields_part_func(THD *thd, Item* func_expr, TABLE *table,
     This is a tricky call to prepare for since it can have a large number
     of interesting side effects, both desirable and undesirable.
   */
+
+  save_use_only_table_context= thd->lex->use_only_table_context;
+  thd->lex->use_only_table_context= TRUE;
+  
   error= func_expr->fix_fields(thd, (Item**)0);
 
+  thd->lex->use_only_table_context= save_use_only_table_context;
+
   context->table_list= save_table_list;
   context->first_name_resolution_table= save_first_table;
   context->last_name_resolution_table= save_last_table;