SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Identifier engine_full
    Identifier total_rows
    Function less (children 1)
     ExpressionList (children 2)
      Identifier total_bytes
      Literal UInt64_100000
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier initial_table_size
