CREATE FUNCTION [dbo].[Fn_GetTable]
     (@ID AS NVARCHAR(MAX))
RETURNS
      @Tbl TABLE (ID NVARCHAR(MAX))
AS
BEGIN
    DECLARE @str AS NVARCHAR(MAX)

    SET @str = 'SELECT * FROM support WHERE support IN ('+@ID+')'

    INSERT INTO @Tbl (ID)
        EXEC sp_executesql @str

    RETURN
END

Create FUNCTION [dbo].[Fn_GetTable] (
 @ID as nvarchar(MAX)
)
RETURNS
@Tbl TABLE (
 ID nvarchar(MAX)
) AS
BEGIN

    INSERT INTO  @Tbl (ID)
    select *
    from support
    where support in (@ID)

RETURN
END

CREATE TYPE dbo.UDT_IDS AS TABLE (ID  NVARCHAR(MAX)) ;

CREATE FUNCTION [dbo].[Fn_GetTable] (
 @IDS as dbo.UDT_IDS READONLY
)
RETURNS
@Tbl TABLE (
 ID NVARCHAR(MAX)
) AS
BEGIN

    INSERT INTO  @Tbl (ID)
    SELECT support
    FROM support
    WHERE support in (SELECT ID FROM @IDS)

RETURN
END