SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.merge_tree_settings
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier name
     Literal \'index_granularity\'