SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function viewExplain (children 1)
       ExpressionList (children 3)
        Literal \'EXPLAIN AST\'
        Literal \'\'
        Literal UInt64_1