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Setting it to Minor due to the incorrect data type in WHERE clause and non-default optimizer switch.
--source include/have_sequence.inc
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--source include/have_partition.inc
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CREATE TABLE t1 (a INT, b DATE, KEY (a), KEY (b)) ENGINE=MyISAM PARTITION BY KEY(a);
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INSERT INTO t1 SELECT seq, DATE_ADD('1500-01-01', INTERVAL seq DAY) FROM seq_1_to_250000;
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SET SESSION optimizer_switch= 'mrr=on,mrr_sort_keys=on,not_null_range_scan=on';
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SELECT * FROM t1 WHERE b = 1;
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# Cleanup
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DROP TABLE t1;
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10.5 6708e67a
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mariadbd: /data/src/10.5/sql/sql_select.cc:7280: double adjust_quick_cost(double, ha_rows): Assertion `cost > 0.0' failed.
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200823 0:37:18 [ERROR] mysqld got signal 6 ;
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#7 0x00007fdc79a6cf12 in __GI___assert_fail (assertion=0x559eaf8cf806 "cost > 0.0", file=0x559eaf8ce578 "/data/src/10.5/sql/sql_select.cc", line=7280, function=0x559eaf8d33c0 <adjust_quick_cost(double, unsigned long long)::__PRETTY_FUNCTION__> "double adjust_quick_cost(double, ha_rows)") at assert.c:101
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#8 0x0000559eaeb7b651 in adjust_quick_cost (quick_cost=7195.4144317757227, records=250000) at /data/src/10.5/sql/sql_select.cc:7280
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#9 0x0000559eaeb7c21d in best_access_path (join=0x7fdc64015520, s=0x7fdc640160a8, remaining_tables=1, join_positions=0x7fdc64016658, idx=0, disable_jbuf=true, record_count=1, pos=0x7fdc64016658, loose_scan_pos=0x7fdc74606f60) at /data/src/10.5/sql/sql_select.cc:7547
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#10 0x0000559eaeb8203c in best_extension_by_limited_search (join=0x7fdc64015520, remaining_tables=1, idx=0, record_count=1, read_time=0, search_depth=62, prune_level=1, use_cond_selectivity=4) at /data/src/10.5/sql/sql_select.cc:9539
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#11 0x0000559eaeb7ff71 in greedy_search (join=0x7fdc64015520, remaining_tables=1, search_depth=62, prune_level=1, use_cond_selectivity=4) at /data/src/10.5/sql/sql_select.cc:8742
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#12 0x0000559eaeb7f1be in choose_plan (join=0x7fdc64015520, join_tables=1) at /data/src/10.5/sql/sql_select.cc:8307
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#13 0x0000559eaeb76a82 in make_join_statistics (join=0x7fdc64015520, tables_list=..., keyuse_array=0x7fdc64015810) at /data/src/10.5/sql/sql_select.cc:5547
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#14 0x0000559eaeb6a712 in JOIN::optimize_inner (this=0x7fdc64015520) at /data/src/10.5/sql/sql_select.cc:2242
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#15 0x0000559eaeb6822a in JOIN::optimize (this=0x7fdc64015520) at /data/src/10.5/sql/sql_select.cc:1618
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#16 0x0000559eaeb734e7 in mysql_select (thd=0x7fdc64000b18, tables=0x7fdc640140e8, fields=..., conds=0x7fdc640149b8, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7fdc640154f8, unit=0x7fdc64004cb0, select_lex=0x7fdc64013af0) at /data/src/10.5/sql/sql_select.cc:4641
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#17 0x0000559eaeb63226 in handle_select (thd=0x7fdc64000b18, lex=0x7fdc64004be8, result=0x7fdc640154f8, setup_tables_done_option=0) at /data/src/10.5/sql/sql_select.cc:429
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#18 0x0000559eaeb27492 in execute_sqlcom_select (thd=0x7fdc64000b18, all_tables=0x7fdc640140e8) at /data/src/10.5/sql/sql_parse.cc:6210
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#19 0x0000559eaeb1e739 in mysql_execute_command (thd=0x7fdc64000b18) at /data/src/10.5/sql/sql_parse.cc:3932
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#20 0x0000559eaeb2c2df in mysql_parse (thd=0x7fdc64000b18, rawbuf=0x7fdc64013a50 "SELECT * FROM t1 WHERE b = 1", length=28, parser_state=0x7fdc74608520, is_com_multi=false, is_next_command=false) at /data/src/10.5/sql/sql_parse.cc:7994
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#21 0x0000559eaeb185d8 in dispatch_command (command=COM_QUERY, thd=0x7fdc64000b18, packet=0x7fdc640087a9 "SELECT * FROM t1 WHERE b = 1", packet_length=28, is_com_multi=false, is_next_command=false) at /data/src/10.5/sql/sql_parse.cc:1868
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#22 0x0000559eaeb16d06 in do_command (thd=0x7fdc64000b18) at /data/src/10.5/sql/sql_parse.cc:1349
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#23 0x0000559eaecbdca4 in do_handle_one_connection (connect=0x559eb3030a18, put_in_cache=true) at /data/src/10.5/sql/sql_connect.cc:1410
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#24 0x0000559eaecbda0c in handle_one_connection (arg=0x559eb3030a18) at /data/src/10.5/sql/sql_connect.cc:1312
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#25 0x0000559eaf1ff632 in pfs_spawn_thread (arg=0x559eb3030648) at /data/src/10.5/storage/perfschema/pfs.cc:2201
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#26 0x00007fdc7b9f54a4 in start_thread (arg=0x7fdc74609700) at pthread_create.c:456
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#27 0x00007fdc79b29d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
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Reproducible with MyISAM and Aria. Couldn't reproduce with InnoDB.
Couldn't reproduce without partitioning.
Couldn't reproduce on 10.4 (without not_null_range_scan).
No obvious problem on a non-debug build, but it's possible that something is wrong with the plan:
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": 0.009770149,
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"table": {
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"table_name": "t1",
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"partitions": ["p0"],
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"access_type": "ref",
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"possible_keys": ["b"],
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"key": "b",
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"key_length": "4",
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"used_key_parts": ["b"],
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"ref": ["const"],
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"r_loops": 1,
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"rows": 250000,
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"r_rows": 0,
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"r_table_time_ms": 0.003905275,
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"r_other_time_ms": 0.002429033,
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"filtered": 100,
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"r_filtered": 100,
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"attached_condition": "t1.b = 1"
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}
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}
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}
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If I put a valid date value in the WHERE clause instead, the assertion failure on a debug build goes away, and the plan on a non-debug build changes:
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": 0.015103378,
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"table": {
|
"table_name": "t1",
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"partitions": ["p0"],
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"access_type": "ref",
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"possible_keys": ["b"],
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"key": "b",
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"key_length": "4",
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"used_key_parts": ["b"],
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"ref": ["const"],
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"r_loops": 1,
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"rows": 1,
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"r_rows": 1,
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"r_table_time_ms": 0.008360501,
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"r_other_time_ms": 0.003273603,
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"filtered": 100,
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"r_filtered": 100
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}
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}
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}
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