Don't throw exception when query ends with semicolon

[xiangfu0]

Semicolon is the standard way to separate each SQL statement in database systems that allow more than one SQL statement to be executed in the same call to the server.

Though Pinot doesn't support multiple statements right now, we shouldn't throw exception when query ends with semicolon.

[jadireddi]

Would like to pick up this ticket.

[jerrinot]

this appears to be fixed by #7861