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Bug#16347426:ASSERTION FAILED: (SELECT_INSERT &&

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!TABLES->NEXT_NAME_RESOLUTION_TABLE) || !TAB
      
Problem:
The context info of select query gets corrupted when a query
with group_concat having order by is present in an order by
clause of the select query. As a result, server crashes with
an assert.
      
Analysis:
While parsing order by for group_concat, it is presumed that
it is always present before the actual order by for the
select query.
As a result, parser uses select->order_list to populate the
order by items of group_concat and creates a select->gorder_list
to which select->order_list is copied onto. Once this is done,
it empties the select->order_list.
In the case presented in the bugpage, as order by is already
parsed when group_concat's order by is encountered, parser
presumes that it is the second order by in the select query
and creates fake_lex_unit which results in the change of
context info.
      
Solution:
Make group_concat's order by parsing independent of the select
This commit is contained in:
Chaithra Gopalareddy 2013-04-14 07:30:49 +05:30
commit 4db726c0fa
6 changed files with 42 additions and 19 deletions
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5
sql/sql_lex.h
View file

@ -1,5 +1,5 @@
/*
Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@ -628,7 +628,7 @@ public:
const char *type; /* type of select for EXPLAIN */
SQL_I_List<ORDER> order_list; /* ORDER clause */
SQL_I_List<ORDER> *gorder_list;
SQL_I_List<ORDER> gorder_list;
Item *select_limit, *offset_limit; /* LIMIT clause parameters */
// Arrays of pointers to top elements of all_fields list
Item **ref_pointer_array;
@ -763,6 +763,7 @@ public:
bool add_group_to_list(THD *thd, Item *item, bool asc);
bool add_ftfunc_to_list(Item_func_match *func);
bool add_order_to_list(THD *thd, Item *item, bool asc);
bool add_gorder_to_list(THD *thd, Item *item, bool asc);
TABLE_LIST* add_table_to_list(THD *thd, Table_ident *table,
LEX_STRING *alias,
ulong table_options,