SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function less (children 1)
     ExpressionList (children 2)
      Function abs (children 1)
       ExpressionList (children 1)
        Function minus (children 1)
         ExpressionList (children 2)
          Function lgamma (children 1)
           ExpressionList (children 1)
            Literal UInt64_3
          Literal Float64_0.693147181
      Literal Float64_1e-8