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Fixed mdev-15162 Query with CTE hangs if assignment operator (:=) is used

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If setting user variable was used in the specification of a recursive CTE
then Item_func_set_user_var::fix_fields() went into an infinite loop.
This commit is contained in:
Igor Babaev
2018-02-06 12:12:19 -08:00
parent bdb87c4965
commit 2ef41622e2
3 changed files with 30 additions and 1 deletions
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13
mysql-test/r/cte_recursive.result
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@@ -3050,3 +3050,16 @@ Warnings:
Note 1003 with recursive destinations as (select `test`.`a`.`arrival` AS `city`,1 AS `legs` from `test`.`flights` `a` where `test`.`a`.`departure` = 'Cairo' union select `test`.`b`.`arrival` AS `arrival`,`r`.`legs` + 1 AS `r.legs + 1` from `destinations` `r` join `test`.`flights` `b` where `r`.`city` = `test`.`b`.`departure` and !<in_optimizer>(`test`.`b`.`arrival`,<exists>(select `destinations`.`city` from `destinations` where trigcond(`test`.`b`.`arrival` = `destinations`.`city` or `destinations`.`city` is null) having trigcond(`destinations`.`city` is null))))select `destinations`.`city` AS `city`,`destinations`.`legs` AS `legs` from `destinations`
set standard_compliant_cte=default;
drop table flights;
#
# MDEV-15162: Setting user variable in recursive CTE
#
SET @c=1;
WITH RECURSIVE cte AS
(SELECT 5
UNION
SELECT @c:=@c+1 FROM cte WHERE @c<3)
SELECT * FROM cte;
5
5
2
3