CREATE TABLE t1 (a INT) ENGINE=MyISAM;
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CREATE TABLE t2 (pk TIME, b INT, primary key (pk), key (b)) ENGINE=MyISAM;
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INSERT INTO t2 VALUES
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('00:13:33',0),('00:13:34',1),('00:13:35',2),('00:13:36',3),
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('00:13:37',4),('00:13:38',5),('00:13:39',6),('00:13:40',7),
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('00:13:41',8),('00:13:42',9);
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SET optimizer_trace = 'enabled=on';
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SELECT * FROM t1 WHERE a IN ( SELECT b FROM t2 INNER JOIN t1 ON (a = pk) );
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# Cleanup
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DROP TABLE t1, t2;
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10.8 1e8bcbd0
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2021-12-09 3:36:46 4 [ERROR] Duplicated key: cause
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mariadbd: /data/src/10.8/sql/my_json_writer.cc:166: Json_writer& Json_writer::add_member(const char*, size_t): Assertion `is_uniq_key' failed.
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211209 3:36:46 [ERROR] mysqld got signal 6 ;
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#7 0x00007f224efc1f36 in __GI___assert_fail (assertion=0x5620c4f2cbb2 "is_uniq_key", file=0x5620c4f2ca50 "/data/src/10.8/sql/my_json_writer.cc", line=166, function=0x5620c4f2cb60 "Json_writer& Json_writer::add_member(const char*, size_t)") at assert.c:101
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#8 0x00005620c4373ffc in Json_writer::add_member (this=0x7f223805c330, name=0x5620c4ec2af8 "cause", len=5) at /data/src/10.8/sql/my_json_writer.cc:166
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#9 0x00005620c4373cfb in Json_writer::add_member (this=0x7f223805c330, name=0x5620c4ec2af8 "cause") at /data/src/10.8/sql/my_json_writer.cc:139
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#10 0x00005620c3fc0f89 in Json_writer_object::add_member (this=0x7f22497e9c60, name=0x5620c4ec2af8 "cause") at /data/src/10.8/sql/my_json_writer.h:432
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#11 0x00005620c3fc13ee in Json_writer_object::add (this=0x7f22497e9c60, name=0x5620c4ec2af8 "cause", value=0x5620c4ec2499 "cost") at /data/src/10.8/sql/my_json_writer.h:513
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#12 0x00005620c418913e in best_access_path (join=0x7f2238058b38, s=0x7f223805ac58, remaining_tables=2, join_positions=0x7f223805b5f0, idx=2, disable_jbuf=true, record_count=1, pos=0x7f223805b850, loose_scan_pos=0x7f22497e9e20) at /data/src/10.8/sql/sql_select.cc:8168
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#13 0x00005620c418dc35 in best_extension_by_limited_search (join=0x7f2238058b38, remaining_tables=2, idx=2, record_count=1, read_time=0, search_depth=62, prune_level=1, use_cond_selectivity=4) at /data/src/10.8/sql/sql_select.cc:9897
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#14 0x00005620c418baaa in greedy_search (join=0x7f2238058b38, remaining_tables=2, search_depth=62, prune_level=1, use_cond_selectivity=4) at /data/src/10.8/sql/sql_select.cc:9073
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#15 0x00005620c418acdc in choose_plan (join=0x7f2238058b38, join_tables=2) at /data/src/10.8/sql/sql_select.cc:8638
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#16 0x00005620c4349643 in optimize_semijoin_nests (join=0x7f2238058b38, all_table_map=7) at /data/src/10.8/sql/opt_subselect.cc:2467
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#17 0x00005620c4182552 in make_join_statistics (join=0x7f2238058b38, tables_list=..., keyuse_array=0x7f2238058e58) at /data/src/10.8/sql/sql_select.cc:5870
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#18 0x00005620c4175d7c in JOIN::optimize_inner (this=0x7f2238058b38) at /data/src/10.8/sql/sql_select.cc:2453
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#19 0x00005620c417366f in JOIN::optimize (this=0x7f2238058b38) at /data/src/10.8/sql/sql_select.cc:1809
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#20 0x00005620c417f094 in mysql_select (thd=0x7f2238000db8, tables=0x7f2238015ad0, fields=..., conds=0x7f2238018b58, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7f2238018f58, unit=0x7f22380051c0, select_lex=0x7f22380154f8) at /data/src/10.8/sql/sql_select.cc:4979
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#21 0x00005620c416e2c1 in handle_select (thd=0x7f2238000db8, lex=0x7f22380050e8, result=0x7f2238018f58, setup_tables_done_option=0) at /data/src/10.8/sql/sql_select.cc:545
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#22 0x00005620c4115ed9 in execute_sqlcom_select (thd=0x7f2238000db8, all_tables=0x7f2238015ad0) at /data/src/10.8/sql/sql_parse.cc:6253
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#23 0x00005620c410d168 in mysql_execute_command (thd=0x7f2238000db8, is_called_from_prepared_stmt=false) at /data/src/10.8/sql/sql_parse.cc:3944
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#24 0x00005620c411ad2a in mysql_parse (thd=0x7f2238000db8, rawbuf=0x7f2238015400 "SELECT * FROM t1 WHERE a IN ( SELECT b FROM t2 INNER JOIN t1 ON (a = pk) )", length=74, parser_state=0x7f22497eb480) at /data/src/10.8/sql/sql_parse.cc:8028
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#25 0x00005620c410717e in dispatch_command (command=COM_QUERY, thd=0x7f2238000db8, packet=0x7f223800b989 "SELECT * FROM t1 WHERE a IN ( SELECT b FROM t2 INNER JOIN t1 ON (a = pk) )", packet_length=74, blocking=true) at /data/src/10.8/sql/sql_parse.cc:1894
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#26 0x00005620c4105b1a in do_command (thd=0x7f2238000db8, blocking=true) at /data/src/10.8/sql/sql_parse.cc:1402
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#27 0x00005620c42db559 in do_handle_one_connection (connect=0x5620c808fb18, put_in_cache=true) at /data/src/10.8/sql/sql_connect.cc:1418
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#28 0x00005620c42db1e9 in handle_one_connection (arg=0x5620c8092178) at /data/src/10.8/sql/sql_connect.cc:1312
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#29 0x00005620c47de6a7 in pfs_spawn_thread (arg=0x5620c808f668) at /data/src/10.8/storage/perfschema/pfs.cc:2201
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#30 0x00007f224f4da609 in start_thread (arg=<optimized out>) at pthread_create.c:477
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#31 0x00007f224f0ad293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
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The failure started happening on 10.8 tree after this commit:
commit 3a96a61eaec6679c6c5b3872383c7fd45e668647 (HEAD)
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Author: Sergei Krivonos
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Date: Fri Nov 12 03:36:10 2021 +0200
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MDEV-27036: add assert to detect duplicated JSON keys
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However, this revision added the assertion itself, so I can't tell whether an actual new problem was introduced by it, or it's a wrong assertion, or it's a good assertion which revealed a previously hidden issue. In the latter case please feel free to remove the label "regression".
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