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MDEV-22910: SIGSEGV in Opt_trace_context::is_started & SIGSEGV in Json_writer::add_table_name (on optimized builds)

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Make sure to initialize members of TABLE::reginfo when TABLE::init is called. In this case the problem
was that table->reginfo.join_tab was set for the SELECT query and then was reused by the UPDATE query.
This case occurred only when the SELECT query had a degenerate join.
This commit is contained in:
Varun Gupta
2020-06-30 18:11:35 +05:30
parent 8e8f9671cb
commit cc0dca3663
4 changed files with 46 additions and 4 deletions
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31
mysql-test/main/opt_trace.result
View File

@ -8559,5 +8559,36 @@ JSON_DETAILED(JSON_EXTRACT(trace, '$**.selectivity_for_columns'))
]
]
drop table t1;
#
# MDEV-22910:SIGSEGV in Opt_trace_context::is_started & SIGSEGV in Json_writer::add_table_name
# (on optimized builds)
#
CREATE TABLE t1( a INT, b INT, PRIMARY KEY( a ) );
SELECT sum(b), row_number() OVER (order by b) FROM t1 WHERE a = 101;
sum(b) row_number() OVER (order by b)
NULL 1
UPDATE t1 SET b=10 WHERE a=1;
SELECT JSON_DETAILED(JSON_EXTRACT(trace, '$**.range_scan_alternatives')) from INFORMATION_SCHEMA.OPTIMIZER_TRACE;
JSON_DETAILED(JSON_EXTRACT(trace, '$**.range_scan_alternatives'))
[
[
{
"index": "PRIMARY",
"ranges":
[
"(1) <= (a) <= (1)"
],
"rowid_ordered": true,
"using_mrr": false,
"index_only": false,
"rows": 0,
"cost": 1.125,
"chosen": true
}
]
]
DROP TABLE t1;
set optimizer_trace='enabled=off';
# End of 10.4 tests

11
mysql-test/main/opt_trace.test
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@ -611,5 +611,16 @@ EXPLAIN EXTENDED SELECT * from t1 WHERE b >= 10 and b < 25;
select JSON_DETAILED(JSON_EXTRACT(trace, '$**.selectivity_for_columns')) from INFORMATION_SCHEMA.OPTIMIZER_TRACE;
drop table t1;
--echo #
--echo # MDEV-22910:SIGSEGV in Opt_trace_context::is_started & SIGSEGV in Json_writer::add_table_name
--echo # (on optimized builds)
--echo #
CREATE TABLE t1( a INT, b INT, PRIMARY KEY( a ) );
SELECT sum(b), row_number() OVER (order by b) FROM t1 WHERE a = 101;
UPDATE t1 SET b=10 WHERE a=1;
SELECT JSON_DETAILED(JSON_EXTRACT(trace, '$**.range_scan_alternatives')) from INFORMATION_SCHEMA.OPTIMIZER_TRACE;
DROP TABLE t1;
set optimizer_trace='enabled=off';
--echo # End of 10.4 tests

4
sql/opt_range.cc
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@ -2690,10 +2690,8 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
DBUG_PRINT("info",("Time to scan table: %g", read_time));
Json_writer_object table_records(thd);
if (head->reginfo.join_tab)
table_records.add_table_name(head->reginfo.join_tab);
else
table_records.add_table_name(head);
Json_writer_object trace_range(thd, "range_analysis");
{
Json_writer_object table_rec(thd, "table_scan");

2
sql/table.cc
View File

@ -5160,6 +5160,8 @@ void TABLE::init(THD *thd, TABLE_LIST *tl)
fulltext_searched= 0;
file->ft_handler= 0;
reginfo.impossible_range= 0;
reginfo.join_tab= NULL;
reginfo.not_exists_optimize= FALSE;
created= TRUE;
cond_selectivity= 1.0;
cond_selectivity_sampling_explain= NULL;