SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Literal \'clickhouse\' (alias s1)
    Literal \'mouse\' (alias s2)
    Function levenshteinDistance (children 1)
     ExpressionList (children 2)
      Identifier s1
      Identifier s2
