SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 3)
    Function greatest (children 1)
     ExpressionList (children 2)
      Identifier a
      Literal UInt64_0
    Function greatest (children 1)
     ExpressionList (children 2)
      Identifier b
      Literal UInt64_0
    Function greatest (children 1)
     ExpressionList (children 2)
      Identifier g
      Literal UInt64_0
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier decimal
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier a