Explain EXPLAIN PIPELINE (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 2)
     Function toStartOfMonth (alias d) (children 1)
      ExpressionList (children 1)
       Identifier date
     Identifier i
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier t_read_in_order
    ExpressionList (children 2)
     OrderByElement (children 1)
      Identifier d
     OrderByElement (children 1)
      Function negate (children 1)
       ExpressionList (children 1)
        Identifier i
    Literal UInt64_5
