ColumnarException.this

this

(string msg,  string file =  __FILE__,  size_t line =  __LINE__,
          Throwable next =  null)

@safe pure

Constructs the exception with a message naming the offending entity.

`msg`	human-readable description of the failure
`file`	source file the exception originates from
`line`	source line the exception originates from
`next`	chained exception, if any