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Also reproducible on MySQL-5.6 and filed as http://bugs.mysql.com/bug.php?id=68706
CREATE TABLE t1 (pk CHAR(3) PRIMARY KEY) ENGINE=MyISAM;
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INSERT INTO t1 VALUES ('abc'),('def');
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SELECT MIN( pk ) FROM t1 GROUP BY UNCOMPRESSED_LENGTH( pk );
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==28464== Thread 4:
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==28464== Conditional jump or move depends on uninitialised value(s)
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==28464== at 0x9A93FE: hp_mask (hp_hash.c:215)
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==28464== by 0x9A9033: hp_search (hp_hash.c:116)
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==28464== by 0x9AD017: heap_rkey (hp_rkey.c:62)
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==28464== by 0x9A4EF9: ha_heap::index_read_map(unsigned char*, unsigned char const*, unsigned long, ha_rkey_function) (ha_heap.cc:290)
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==28464== by 0x56BFED: handler::ha_index_read_map(unsigned char*, unsigned char const*, unsigned long, ha_rkey_function) (sql_class.h:3678)
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==28464== by 0x737DE5: end_update(JOIN*, st_join_table*, bool) (sql_select.cc:17221)
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==28464== by 0x734D88: evaluate_join_record(JOIN*, st_join_table*, int) (sql_select.cc:16078)
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==28464== by 0x7347BF: sub_select(JOIN*, st_join_table*, bool) (sql_select.cc:15920)
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==28464== by 0x733E0B: do_select(JOIN*, List<Item>*, st_table*, Procedure*) (sql_select.cc:15541)
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==28464== by 0x712343: JOIN::exec() (sql_select.cc:2316)
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==28464== by 0x714A64: mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:2990)
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==28464== by 0x70B40E: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:288)
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==28464== by 0x6968A2: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5172)
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==28464== by 0x68D661: mysql_execute_command(THD*) (sql_parse.cc:2305)
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==28464== by 0x69931C: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6173)
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==28464== by 0x68AE05: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1243)
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==28464== Conditional jump or move depends on uninitialised value(s)
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==28464== at 0xC0019D: my_bcmp (bcmp.c:60)
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==28464== by 0x9AA556: hp_key_cmp (hp_hash.c:712)
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==28464== by 0x9A9060: hp_search (hp_hash.c:120)
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==28464== by 0x9AD017: heap_rkey (hp_rkey.c:62)
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==28464== by 0x9A4EF9: ha_heap::index_read_map(unsigned char*, unsigned char const*, unsigned long, ha_rkey_function) (ha_heap.cc:290)
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==28464== by 0x56BFED: handler::ha_index_read_map(unsigned char*, unsigned char const*, unsigned long, ha_rkey_function) (sql_class.h:3678)
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==28464== by 0x737DE5: end_update(JOIN*, st_join_table*, bool) (sql_select.cc:17221)
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==28464== by 0x734D88: evaluate_join_record(JOIN*, st_join_table*, int) (sql_select.cc:16078)
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==28464== by 0x7347BF: sub_select(JOIN*, st_join_table*, bool) (sql_select.cc:15920)
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==28464== by 0x733E0B: do_select(JOIN*, List<Item>*, st_table*, Procedure*) (sql_select.cc:15541)
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==28464== by 0x712343: JOIN::exec() (sql_select.cc:2316)
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==28464== by 0x714A64: mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:2990)
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==28464== by 0x70B40E: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:288)
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==28464== by 0x6968A2: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5172)
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==28464== by 0x68D661: mysql_execute_command(THD*) (sql_parse.cc:2305)
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==28464== by 0x69931C: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6173)
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revision-id: sergii@pisem.net-20130318074424-frdzldas283cvx1w
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revno: 3638
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branch-nick: 5.3
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Also, a debug non-valgrind build, e.g. BUILD/compile-pentium-debug-max-no-ndb on maria/5.5, produces an unexpected error instead of valgrind values:
CREATE TABLE t1 (pk CHAR(3) PRIMARY KEY) ENGINE=MyISAM;
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INSERT INTO t1 VALUES ('abc'),('def');
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SELECT MIN( pk ) FROM t1 GROUP BY UNCOMPRESSED_LENGTH( pk );
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bug.t1 [ fail ]
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Test ended at 2013-03-18 23:35:27
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CURRENT_TEST: bug.t1
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mysqltest: At line 5: query 'SELECT MIN( pk ) FROM t1 GROUP BY UNCOMPRESSED_LENGTH( pk )' failed: 1062: Duplicate entry '0' for key 'group_key'
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