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MDEV-26724 Endless loop in json_escape_to_string upon ... empty string

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Part#3:
- make json_escape() return different errors on conversion error
  and on out-of-space condition.
- Make histogram code handle conversion errors.
This commit is contained in:
Sergei Petrunia
2021-10-10 11:51:04 +03:00
parent 8e0a342b91
commit 3936dc3353
6 changed files with 65 additions and 16 deletions
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14
mysql-test/main/statistics_json.test
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@ -228,6 +228,20 @@ where db_name=database() and table_name='t1';
select * from t1;
drop table t1;
--echo #
--echo # Another testcase: use a character that cannot be represented in utf8:
--echo #
create table t1 ( a varchar(100) character set cp1251);
insert into t1 values ( _cp1251 x'88'),( _cp1251 x'98');
analyze table t1 persistent for all;
--echo # Command succeeded but no histogram was collected:
select hist_type, histogram
from mysql.column_stats
where db_name=database() and table_name='t1';
drop table t1;
--echo #
--echo # ASAN use-after-poison my_strnxfrm_simple_internal / Histogram_json_hb::range_selectivity ...
--echo # (Just the testcase)