[MDEV-3421] LP:779885 - Crash in eliminate_item_equal with materialization=on in maria-5.3 Created: 2011-05-09  Updated: 2015-02-02  Resolved: 2012-10-04

Status: Closed
Project: MariaDB Server
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Bug Priority: Major
Reporter: Philip Stoev (Inactive) Assignee: Sergei Petrunia
Resolution: Fixed Votes: 0
Labels: Launchpad

Attachments: XML File LPexportBug779885.xml    

 Description   

Repeatable with maria-5.3, maria-5.3-mwl89. Not repeatable with maria-5.2. Seems to require materialization=on. Explain also crashes.

backtrace:

#4 <signal handler called>
#5 0x08321404 in eliminate_item_equal (cond=0x0, upper_levels=0x0, item_equal=0xae614be8) at sql_select.cc:10165
#6 0x0832193f in substitute_for_best_equal_field (cond=0xae614be8, cond_equal=0x0, table_join_idx=0xae614d98) at sql_select.cc:10300
#7 0x0830adf4 in JOIN::optimize (this=0xae62db38) at sql_select.cc:1066
#8 0x083100a1 in mysql_select (thd=0x9382e48, rref_pointer_array=0x93848e8, tables=0xae613080, wild_num=1, fields=..., conds=0xae614168, og_num=0,
order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147764736, result=0xae614300, unit=0x9384548, select_lex=0x93847e4)
at sql_select.cc:2687
#9 0x08308983 in handle_select (thd=0x9382e48, lex=0x93844ec, result=0xae614300, setup_tables_done_option=0) at sql_select.cc:282
#10 0x082a5cc8 in execute_sqlcom_select (thd=0x9382e48, all_tables=0xae613080) at sql_parse.cc:5094
#11 0x0829cb12 in mysql_execute_command (thd=0x9382e48) at sql_parse.cc:2239
#12 0x082a826b in mysql_parse (thd=0x9382e48,
rawbuf=0xae612eb0 "SELECT *\nFROM t1\nWHERE\n( 't' ) IN (\nSELECT t3.f10\nFROM t3 \nJOIN t4\nON t4.f10 = t3.f10 \n)", length=88,
found_semicolon=0xae983228) at sql_parse.cc:6094
#13 0x0829a79b in dispatch_command (command=COM_QUERY, thd=0x9382e48,
packet=0x93dd9a1 "SELECT *\nFROM t1\nWHERE\n( 't' ) IN (\nSELECT t3.f10\nFROM t3 \nJOIN t4\nON t4.f10 = t3.f10 \n)", packet_length=88)
at sql_parse.cc:1215
#14 0x08299bf9 in do_command (thd=0x9382e48) at sql_parse.cc:904
#15 0x08296cac in handle_one_connection (arg=0x9382e48) at sql_connect.cc:1154
#16 0x00821919 in start_thread () from /lib/libpthread.so.0
#17 0x0076acce in clone () from /lib/libc.so.6

test case:

SET SESSION optimizer_switch = 'materialization=on';
CREATE TABLE t1 ( f1 int );
INSERT INTO t1 VALUES (19), (20);

CREATE TABLE t3 ( f10 varchar(32) );
INSERT INTO t3 VALUES ('a'),('b');

CREATE TABLE t4 ( f10 varchar(32) );
INSERT INTO t4 VALUES ('c'),('d');

SELECT *
FROM t1
WHERE
( 't' ) IN (
SELECT t3.f10
FROM t3
JOIN t4
ON t4.f10 = t3.f10
);

 Comments   
Comment by Timour Katchaounov (Inactive) [ 2011-05-09 ]

Re: Crash in eliminate_item_equal with materialization=on in maria-5.3
There is no crash neither with non-flattened materialization, nor with IN-TO-EXISTS.
The crash is in semijoin materialization, thus reassigning to SergeyP.

Comment by Philip Stoev (Inactive) [ 2011-05-09 ]

Re: Crash in eliminate_item_equal with materialization=on in maria-5.3
Also reproducible with comma-style join:

CREATE TABLE t1 ( f1 int );
INSERT INTO t1 VALUES (19), (20);

CREATE TABLE t3 ( f10 varchar(32) );
INSERT INTO t3 VALUES ('a'),('b');

CREATE TABLE t4 ( f10 varchar(32) );
INSERT INTO t4 VALUES ('c'),('d');

SELECT *
FROM t1
WHERE
( 't' ) IN (
SELECT t3.f10
FROM t3,t4
WHERE t4.f10 = t3.f10
);

Comment by Rasmus Johansson (Inactive) [ 2011-12-13 ]

Launchpad bug id: 779885

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