Github user httfighter commented on the issue:
https://github.com/apache/spark/pull/21826
I did the following tests in mysql.
mysql> select "abc" || "def";
+----------------+
| "abc" || "def" |
+----------------+
| 0 |
+----------------+
mysql> select "abc" "def";
+--------+
| abc |
+--------+
| abcdef |
+--------+
mysql> select * from aa where id=1 || id=2;
+------+------+
| id | name |
+------+------+
| 1 | sdf |
| 2 | ader |
+------+------+
mysql> select * from aa where id=1 or id=2;
+------+------+
| id | name |
+------+------+
| 1 | sdf |
| 2 | ader |
+------+------+
It seems that it does not act as a string connector, but as an "or"
operation. I don't know if my tests are correct.
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