SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Literal Array_[\'Seconds\', \'Bool\', \'Int64\', \'String\', \'Float\', \'UInt64\', \'MaxThreads\'] (alias types)
   ExpressionList (children 1)
    Function hasAll (children 1)
     ExpressionList (children 2)
      Function arrayDistinct (children 1)
       ExpressionList (children 1)
        Function groupArray (children 1)
         ExpressionList (children 1)
          Identifier type
      Identifier types
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.merge_tree_settings