SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function max (children 1)
     ExpressionList (children 1)
      Identifier key
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab_00612
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 1)
       Identifier n.x (alias val)
   Function in (children 1)
    ExpressionList (children 2)
     Function tuple (children 1)
      ExpressionList (children 2)
       Identifier key
       Identifier val
     Function tuple (children 1)
      ExpressionList (children 1)
       Literal Tuple_(UInt64_1, UInt64_1)