Update Escaping.md

[Eclipsium]

add = symbol

Type of Change:

• Documentation update

Description of the Change:

add = to escape symbol

[sanikolaev]

@Eclipsium Thank you for the PR. In what case does it help? For me it looks more like a bug, e.g.:

mysql> drop table if exists t; create table t(f text) charset_table='non_cjk, =' morphology='stem_en' index_exact_words='1'; show warnings; insert into t values(1, 'running'),(2, 'run'),(3, '=run'); select * from t where match('\\=run'); show meta;
--------------
drop table if exists t
--------------

Query OK, 0 rows affected (0.01 sec)

--------------
create table t(f text) charset_table='non_cjk, =' morphology='stem_en' index_exact_words='1'
--------------

Query OK, 0 rows affected (0.02 sec)

--------------
show warnings
--------------

Query OK, 0 rows affected (0.00 sec)

--------------
insert into t values(1, 'running'),(2, 'run'),(3, '=run')
--------------

Query OK, 3 rows affected (0.00 sec)

--------------
select * from t where match('\\=run')
--------------

+------+------+
| id   | f    |
+------+------+
|    2 | run  |
+------+------+
1 row in set (0.01 sec)

--------------
show meta
--------------

+----------------+-------+
| Variable_name  | Value |
+----------------+-------+
| total          | 1     |
| total_found    | 1     |
| total_relation | eq    |
| time           | 0.000 |
| keyword[0]     | =run  |
| docs[0]        | 1     |
| hits[0]        | 1     |
+----------------+-------+
7 rows in set (0.00 sec)

I would expect:

|    3 | =run  |

in this case, because = is in the charset_table and escaped.

The same with < instead of = works fine:

mysql> drop table if exists t; create table t(f text) charset_table='non_cjk, <' morphology='stem_en' index_exact_words='1'; show warnings; insert into t values(1, 'running'),(2, 'run'),(3, '<run'); select * from t where match('\\<run'); show meta;
--------------
drop table if exists t
--------------

Query OK, 0 rows affected (0.01 sec)

--------------
create table t(f text) charset_table='non_cjk, <' morphology='stem_en' index_exact_words='1'
--------------

Query OK, 0 rows affected (0.00 sec)

--------------
show warnings
--------------

Query OK, 0 rows affected (0.00 sec)

--------------
insert into t values(1, 'running'),(2, 'run'),(3, '<run')
--------------

Query OK, 3 rows affected (0.00 sec)

--------------
select * from t where match('\\<run')
--------------

+------+------+
| id   | f    |
+------+------+
|    3 | <run |
+------+------+
1 row in set (0.00 sec)

--------------
show meta
--------------

+----------------+-------+
| Variable_name  | Value |
+----------------+-------+
| total          | 1     |
| total_found    | 1     |
| total_relation | eq    |
| time           | 0.000 |
| keyword[0]     | <run  |
| docs[0]        | 1     |
| hits[0]        | 1     |
+----------------+-------+
7 rows in set (0.00 sec)

So it seems to me that instead of merging the PR we need to file a bug report about it.