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