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MDEV-26764: JSON_HB Histograms: handle BINARY and unassigned characters

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Encode such characters in hex.
This commit is contained in:
Sergei Petrunia
2021-12-03 20:13:43 +03:00
parent 748b293c14
commit d8d57d2c27
4 changed files with 130 additions and 22 deletions
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32
mysql-test/main/statistics_json.result
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@ -7896,16 +7896,41 @@ a
drop table t1;
#
# Another testcase: use a character that cannot be represented in utf8:
# Also, now it's testcase for:
# MDEV-26764: JSON_HB Histograms: handle BINARY and unassigned characters
#
create table t1 ( a varchar(100) character set cp1251);
insert into t1 values ( _cp1251 x'88'),( _cp1251 x'98');
insert into t1 values ( _cp1251 x'88'),( _cp1251 x'88'), ( _cp1251 x'88');
insert into t1 values ( _cp1251 x'98'),( _cp1251 x'98');
analyze table t1 persistent for all;
Table Op Msg_type Msg_text
test.t1 analyze status Operation failed
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
select hist_type, histogram
from mysql.column_stats
where db_name=database() and table_name='t1';
hist_type histogram
JSON_HB {
"target_histogram_size": 10,
"collected_at": "REPLACED",
"collected_by": "REPLACED",
"histogram_hb": [
{
"start": "€",
"size": 0.6,
"ndv": 1
},
{
"start_hex": "98",
"end_hex": "98",
"size": 0.4,
"ndv": 1
}
]
}
analyze select * from t1 where a=_cp1251 x'88';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 5.00 60.00 60.00 Using where
drop table t1;
#
# ASAN use-after-poison my_strnxfrm_simple_internal / Histogram_json_hb::range_selectivity ...
@ -8102,7 +8127,8 @@ set histogram_type= JSON_HB, histogram_size= 1;
insert into t1 values ('foo'),(unhex('9C'));
analyze table t1 persistent for all;
Table Op Msg_type Msg_text
test.t1 analyze status Operation failed
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
select * from t1;
a
foo