SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Literal Array_[NULL]
    Function sumMapWithOverflow (children 1)
     ExpressionList (children 4)
      Identifier events
      Literal Array_[NULL]
      Function array (children 1)
       ExpressionList (children 1)
        Function array (children 1)
         ExpressionList (children 1)
          Literal NULL
      Identifier counts
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier sum_map_overflow