Details
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Bug
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Status: Closed (View Workflow)
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Critical
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Resolution: Fixed
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None
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None
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None
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None
Description
mysqld: protocol.cc:509: void net_end_statement(THD*): Assertion `0' failed.
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120216 1:46:27 [ERROR] mysqld got signal 6 ;
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#8 0xb74a3014 in __assert_fail () from /lib/libc.so.6
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#9 0x082c50ed in net_end_statement (thd=0x93efc00) at protocol.cc:509
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#10 0x082e25cc in dispatch_command (command=COM_QUERY, thd=0x93efc00,
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packet=0x9449561 "SELECT DISTINCT a AS field1 FROM t1, t2 \nWHERE EXISTS ( \nSELECT c FROM t3 RIGHT JOIN t2 ON b = d \n) \nHAVING field1 > 8 \nLIMIT_ROWS_EXAMINED 20", packet_length=142)
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at sql_parse.cc:1620
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#11 0x082e0a27 in do_command (thd=0x93efc00) at sql_parse.cc:923
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#12 0x082dd9ad in handle_one_connection (arg=0x93efc00) at sql_connect.cc:1193
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Query (0x945f7c8): SELECT DISTINCT a AS field1 FROM t1, t2 WHERE EXISTS ( SELECT c FROM t3 LEFT JOIN t2 ON b = d ) HAVING field1 > 8 LIMIT_ROWS_EXAMINED 20
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Connection ID (thread ID): 1
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Status: NOT_KILLED
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Could not reproduce on the same query without LIMIT_ROWS_EXAMINED.
bzr version-info
revision-id: timour@askmonty.org-20120213145248-tlvsd794o83odf2r
date: 2012-02-13 16:52:48 +0200
build-date: 2012-02-16 01:48:07 +0400
revno: 3417
EXPLAIN:
id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t1 system NULL NULL NULL NULL 1 100.00 Using temporary
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1 PRIMARY t2 ALL NULL NULL NULL NULL 3 100.00 Distinct
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2 SUBQUERY t3 ALL NULL NULL NULL NULL 3 100.00
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join)
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Warnings:
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Note 1003 select distinct 'USA' AS `field1` from `test`.`t1` join `test`.`t2` where exists(select `test`.`t3`.`c` from `test`.`t3` left join `test`.`t2` on((`test`.`t2`.`b` = `test`.`t3`.`d`)) where 1) having (`field1` > 8)
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Minimal optimizer_switch: in_to_exists=on,outer_join_with_cache=on
Full optimizer_switch (default): index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on
Test case:
SET optimizer_switch='in_to_exists=on,outer_join_with_cache=on';
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CREATE TABLE t1 ( a VARCHAR(3) ) ENGINE=MyISAM;
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INSERT INTO t1 VALUES ('USA');
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CREATE TABLE t2 ( b INT );
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INSERT INTO t2 VALUES
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(3899),(3914),(3888);
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CREATE TABLE t3 ( c VARCHAR(33), d INT );
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INSERT INTO t3 VALUES
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('USASpanish',8),('USATagalog',0),('USAVietnamese',0);
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SELECT DISTINCT a AS field1 FROM t1, t2
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WHERE EXISTS (
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SELECT c FROM t3 LEFT JOIN t2 ON b = d
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)
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HAVING field1 > 8
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LIMIT_ROWS_EXAMINED 20;
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# End of test case
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Attachments
Issue Links
- relates to
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MDEV-28 LIMIT ROWS EXAMINED clause to limit the number of rows examined during SELECT processing
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- Closed
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