The code did not handle the SqlSQL2TokenTypes::DELIMITED_ID case. Unfortunately, it will take some effort to handle this as sending the quoted "ra" as above to mysql results in output like that below. Getting this into a form that's agreable to both antlr and mysql will likely take significant effort.

  > select "ra", decl FROM Source WHERE objectId IN (386950783579546);

 +------+-------------------+

| ra   | decl              |

+------+-------------------+

| ra   | -5.82522757382841 |

| ra   | -5.82525653359452 |

| ra   | -5.82521730993245 |

This ticket asks for quotes around column names to be supported; this does not work as I think is desired in mysql:

MariaDB [qservTest_case01_mysql]> select "ra_PS" from Object limit 5;
-------
| ra_PS |
-------
| ra_PS |
| ra_PS |
| ra_PS |
| ra_PS |
| ra_PS |
-------
5 rows in set (0.01 sec)

I think the desired behavior is as with backticks:

MariaDB [qservTest_case01_mysql]> select `ra_PS` from Object limit 5;
------------------
| ra_PS |
------------------
| 1.13454822151113 |
| 1.13454822151115 |
| 359.337499495437 |
| 359.161551380273 |
| 358.710919511197 |
------------------
5 rows in set (0.01 sec)

Which works with qserv, at least with changes implemented in DM-16532.

Wont fix this one because it's a duplicate.