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In this test case JSON_TABLE references a column from t2 which is only joined later. To my understanding, it is expected to fail with ER_BAD_FIELD_ERROR (and it does in MySQL), but instead it succeeds and returns a result set. I don't know if it's a bug, and if it is, how much of a problem it is.
CREATE TABLE t1 (o INT);
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INSERT INTO t1 VALUES (1),(2);
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CREATE TABLE t2 (a INT);
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INSERT INTO t2 VALUES (3),(4);
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SELECT * FROM JSON_TABLE(a, '$' COLUMNS(o FOR ORDINALITY)) AS jt1 NATURAL JOIN t1 JOIN t2;
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# Cleanup
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DROP TABLE t1, t2;
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bb-10.6-mdev17399-hf 3530463bc
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SELECT * FROM JSON_TABLE(a, '$' COLUMNS(o FOR ORDINALITY)) AS jt1 NATURAL JOIN t1 JOIN t2;
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o a
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1 3
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1 4
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": 0.128189085,
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 2,
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"r_rows": 2,
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"r_table_time_ms": 0.008660748,
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"r_other_time_ms": 0.025902145,
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"filtered": 100,
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"r_filtered": 100
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},
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"block-nl-join": {
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"table": {
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"table_name": "t2",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 2,
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"r_rows": 2,
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"r_table_time_ms": 0.004725865,
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"r_other_time_ms": 0.044695468,
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"filtered": 100,
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"r_filtered": 100
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},
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"buffer_type": "flat",
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"buffer_size": "65",
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"join_type": "BNL",
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"r_filtered": 100
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},
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"table": {
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"table_name": "jt1",
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"access_type": "ALL",
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"r_loops": 4,
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"rows": 40,
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"r_rows": 1,
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"r_table_time_ms": 0.005747132,
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"r_other_time_ms": 0.013326538,
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"filtered": 100,
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"r_filtered": 50,
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"table_function": "json_table",
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"attached_condition": "jt1.o = t1.o"
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}
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}
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}
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But the following case, which only differs from the previous one by using STRAIGHT_JOIN instead of JOIN, makes a non-debug server crash, and a debug server fail on an assertion. So, this part is undoubtedly a bug; and I presume it has the same cause as the above, so I'm filing them together.
CREATE TABLE t1 (o INT);
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INSERT INTO t1 VALUES (1),(2);
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CREATE TABLE t2 (a INT);
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INSERT INTO t2 VALUES (3),(4);
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SELECT * FROM JSON_TABLE(a, '$' COLUMNS(o FOR ORDINALITY)) AS jt1 NATURAL JOIN t1 STRAIGHT_JOIN t2;
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# Cleanup
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DROP TABLE t1, t2;
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debug build
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mariadbd: /data/src/bb-10.6-mdev17399-hf/sql/sql_select.cc:8845: bool greedy_search(JOIN*, table_map, uint, uint, uint): Assertion `join->best_read < double(1.79769313486231570814527423731704357e+308L)' failed.
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210319 14:29:31 [ERROR] mysqld got signal 6 ;
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#7 0x00007f6a5c9bdf36 in __GI___assert_fail (assertion=0x55b7aa9c1b60 "join->best_read < double(1.79769313486231570814527423731704357e+308L)", file=0x55b7aa9bc700 "/data/src/bb-10.6-mdev17399-hf/sql/sql_select.cc", line=8845, function=0x55b7aa9c1b00 "bool greedy_search(JOIN*, table_map, uint, uint, uint)") at assert.c:101
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#8 0x000055b7a89ff44c in greedy_search (join=0x62b00003c9c8, remaining_tables=7, search_depth=62, prune_level=1, use_cond_selectivity=4) at /data/src/bb-10.6-mdev17399-hf/sql/sql_select.cc:8845
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#9 0x000055b7a89fd035 in choose_plan (join=0x62b00003c9c8, join_tables=7) at /data/src/bb-10.6-mdev17399-hf/sql/sql_select.cc:8402
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#10 0x000055b7a89e838d in make_join_statistics (join=0x62b00003c9c8, tables_list=..., keyuse_array=0x62b00003ccb8) at /data/src/bb-10.6-mdev17399-hf/sql/sql_select.cc:5639
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#11 0x000055b7a89c53ad in JOIN::optimize_inner (this=0x62b00003c9c8) at /data/src/bb-10.6-mdev17399-hf/sql/sql_select.cc:2270
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#12 0x000055b7a89be846 in JOIN::optimize (this=0x62b00003c9c8) at /data/src/bb-10.6-mdev17399-hf/sql/sql_select.cc:1639
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#13 0x000055b7a89df2a0 in mysql_select (thd=0x62b000069288, tables=0x62b000039b60, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x62b00003c998, unit=0x62b00006d460, select_lex=0x62b0000383e0) at /data/src/bb-10.6-mdev17399-hf/sql/sql_select.cc:4733
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#14 0x000055b7a89b0822 in handle_select (thd=0x62b000069288, lex=0x62b00006d398, result=0x62b00003c998, setup_tables_done_option=0) at /data/src/bb-10.6-mdev17399-hf/sql/sql_select.cc:417
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#15 0x000055b7a891a9c2 in execute_sqlcom_select (thd=0x62b000069288, all_tables=0x62b000039b60) at /data/src/bb-10.6-mdev17399-hf/sql/sql_parse.cc:6230
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#16 0x000055b7a8909ca4 in mysql_execute_command (thd=0x62b000069288) at /data/src/bb-10.6-mdev17399-hf/sql/sql_parse.cc:3926
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#17 0x000055b7a8925c6d in mysql_parse (thd=0x62b000069288, rawbuf=0x62b0000382a8 "SELECT * FROM JSON_TABLE(a, '$' COLUMNS(o FOR ORDINALITY)) AS jt1 NATURAL JOIN t1 STRAIGHT_JOIN t2", length=98, parser_state=0x7f6a537ff7b0) at /data/src/bb-10.6-mdev17399-hf/sql/sql_parse.cc:8000
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#18 0x000055b7a88fc6a8 in dispatch_command (command=COM_QUERY, thd=0x62b000069288, packet=0x62900024e289 "SELECT * FROM JSON_TABLE(a, '$' COLUMNS(o FOR ORDINALITY)) AS jt1 NATURAL JOIN t1 STRAIGHT_JOIN t2", packet_length=98, blocking=true) at /data/src/bb-10.6-mdev17399-hf/sql/sql_parse.cc:1886
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#19 0x000055b7a88f93e3 in do_command (thd=0x62b000069288, blocking=true) at /data/src/bb-10.6-mdev17399-hf/sql/sql_parse.cc:1397
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#20 0x000055b7a8d3ae85 in do_handle_one_connection (connect=0x61100000ad48, put_in_cache=true) at /data/src/bb-10.6-mdev17399-hf/sql/sql_connect.cc:1410
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#21 0x000055b7a8d3a7e2 in handle_one_connection (arg=0x61100000ac08) at /data/src/bb-10.6-mdev17399-hf/sql/sql_connect.cc:1312
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#22 0x000055b7a9a4508b in pfs_spawn_thread (arg=0x616000102a08) at /data/src/bb-10.6-mdev17399-hf/storage/perfschema/pfs.cc:2201
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#23 0x00007f6a5ced5609 in start_thread (arg=<optimized out>) at pthread_create.c:477
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#24 0x00007f6a5caa9293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
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release build
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#3 <signal handler called>
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#4 JOIN::fix_all_splittings_in_plan (this=this@entry=0x7fe2f8014b60) at /data/src/bb-10.6-mdev17399-hf-rel/sql/opt_split.cc:1155
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#5 0x000055bc3a0113a0 in JOIN::optimize_inner (this=0x7fe2f8014b60) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_select.cc:2287
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#6 0x000055bc3a011a53 in JOIN::optimize (this=this@entry=0x7fe2f8014b60) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_select.cc:1639
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#7 0x000055bc3a011b17 in mysql_select (thd=0x7fe2f8000c58, tables=0x7fe2f8011de8, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=<optimized out>, result=0x7fe2f8014b38, unit=0x7fe2f8004c70, select_lex=0x7fe2f80106e8) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_select.cc:4733
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#8 0x000055bc3a0125e7 in handle_select (thd=thd@entry=0x7fe2f8000c58, lex=lex@entry=0x7fe2f8004ba8, result=result@entry=0x7fe2f8014b38, setup_tables_done_option=setup_tables_done_option@entry=0) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_select.cc:417
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#9 0x000055bc39fa5761 in execute_sqlcom_select (thd=0x7fe2f8000c58, all_tables=0x7fe2f8011de8) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_parse.cc:6230
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#10 0x000055bc39fb36ae in mysql_execute_command (thd=0x7fe2f8000c58) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_parse.cc:3926
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#11 0x000055bc39fa077d in mysql_parse (thd=0x7fe2f8000c58, rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_parse.cc:8000
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#12 0x000055bc39fac73d in dispatch_command (command=COM_QUERY, thd=0x7fe2f8000c58, packet=<optimized out>, packet_length=<optimized out>, blocking=<optimized out>) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_class.h:1318
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#13 0x000055bc39fae7e6 in do_command (thd=0x7fe2f8000c58, blocking=blocking@entry=true) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_parse.cc:1397
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#14 0x000055bc3a0aaa97 in do_handle_one_connection (connect=<optimized out>, put_in_cache=true) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_connect.cc:1410
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#15 0x000055bc3a0aadfd in handle_one_connection (arg=arg@entry=0x55bc3c29bdb8) at /data/src/bb-10.6-mdev17399-hf-rel/sql/sql_connect.cc:1312
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#16 0x000055bc3a4029c6 in pfs_spawn_thread (arg=0x55bc3bf06e48) at /data/src/bb-10.6-mdev17399-hf-rel/storage/perfschema/pfs.cc:2201
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#17 0x00007fe30e006609 in start_thread (arg=<optimized out>) at pthread_create.c:477
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#18 0x00007fe30dbda293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
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