SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 7)
    Function count (children 1)
     ExpressionList
    Function count (children 1)
     ExpressionList (children 1)
      Identifier a
    Function max (children 1)
     ExpressionList (children 1)
      Identifier a
    Function min (children 1)
     ExpressionList (children 1)
      Identifier a
    Function avg (children 1)
     ExpressionList (children 1)
      Identifier a
    Function sum (children 1)
     ExpressionList (children 1)
      Identifier a
    Function any (children 1)
     ExpressionList (children 1)
      Identifier a
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function CAST (alias a) (children 1)
            ExpressionList (children 2)
             Literal NULL
             Literal \'Nullable(Float64)\'