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MDEV-10779 Failing assertion lex->proc_list.elements == 0 or syntax error on PROCEDURE ANALYSE in UNION

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Reverting a part of the patch for "MDEV-8909union parser cleanup",
as a parenthesized SELECT with PROCEDURE followed by UNION is not
disallowed by the grammar (only a non-parenthesized SELECT with PROCEDURE
followed by a UNION is disallowed grammatically).
This commit is contained in:
Alexander Barkov
2016-09-13 20:28:58 +04:00
parent 54b81ac57f
commit a0db19bed9
3 changed files with 105 additions and 2 deletions
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18
sql/sql_parse.cc
View File

@@ -7485,8 +7485,22 @@ mysql_new_select(LEX *lex, bool move_down)
DBUG_RETURN(TRUE);
}
// SELECT 1 FROM t1 PROCEDURE ANALYSE() UNION ... -- not possible
DBUG_ASSERT(lex->proc_list.elements == 0);
/*
This type of query is not possible in the grammar:
SELECT 1 FROM t1 PROCEDURE ANALYSE() UNION ... ;
But this type of query is still possible:
(SELECT 1 FROM t1 PROCEDURE ANALYSE()) UNION ... ;
and it's not easy to disallow this grammatically,
because there can be any parenthesis nest level:
(((SELECT 1 FROM t1 PROCEDURE ANALYSE()))) UNION ... ;
*/
if (lex->proc_list.elements!=0)
{
my_error(ER_WRONG_USAGE, MYF(0), "UNION",
"SELECT ... PROCEDURE ANALYSE()");
DBUG_RETURN(TRUE);
}
// SELECT 1 FROM t1 ORDER BY 1 UNION SELECT 1 FROM t1 -- not possible
DBUG_ASSERT(!lex->current_select->order_list.first ||
lex->current_select->braces);