SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayReduce (children 1)
     ExpressionList (children 3)
      Literal \'simpleLinearRegression\'
      Function emptyArrayUInt8 (children 1)
       ExpressionList
      Function emptyArrayUInt8 (children 1)
       ExpressionList