Details
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Technical task
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Status: Closed (View Workflow)
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Critical
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Resolution: Fixed
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10.2(EOL)
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None
Description
Running of the following test case
CREATE TABLE t1 (id INT); |
CREATE TABLE t2 (c1 INT, c2 INT); |
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PREPARE stmt FROM 'with recursive rcte(a) as (select 1 union select cast(a+1 as unsigned) from rcte where a < 10), cte1 as (select count(*) as c1 from t1), cte2 as (select count(*) as c2 from t2) select * from cte1,cte2'; |
leads to firing of assert in the function reinit_stmt_before_use()
Assertion failed: (sl->join == 0), function <unknown>, file bb-10.6-MDEV-25973/sql/sql_prepare.cc, line 3174.
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and server crash.
The data member SELECT_LEX::join points to a JOIN object created by the following calling sequence:
check_prepared_statement
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mysql_test_select
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open_normal_and_derived_tables
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mysql_handle_derived
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mysql_derived_prepare
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st_select_lex_unit::prepare
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st_select_lex_unit::prepare_join
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By some unknown reason the SELECT_LEX object that is owner of this JOIN object is not added to a list which head addressed by lex->unit.first_select()
In result, when later the method Prepared_statement::prepare() calls lex->unit.cleanup() to clean up objects created on preparing the statement, the method JOIN::destroy() is not called for the JOIN object created on handling the statement
PREPARE stmt FROM 'with recursive rcte(a) as (select 1 union select cast(a+1 as unsigned) from rcte where a < 10), cte1 as (select count(*) as c1 from t1), cte2 as (select count(*) as c2 from t2) select * from cte1,cte2'; |
As a consequence, the data member SELECT_LEX::join is not reset and the assert (sl->join == 0) fired later on attempt to run the statement
EXECUTE stmt; |
Attachments
Issue Links
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MDEV-25973 Fix tests that were temporary disabled in PS mode
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- Stalled
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