Hi Francis,
There should be multiple ways to achieve this. Do you mean that all these
methods don't work for you? If so, could you show the sample code? Besides,
another way you may try is `inputmetrics.alias("timestamp, device, name,
value")`.
Regards,
Dian
On Wed, Feb 16, 2022 at 8:14 AM Francis Conroy <francis.con...@switchdin.com>
wrote:
> Hi all,
>
> I'm hoping to be able to change the column names when creating a table
> from a datastream, the flatmap function generating the stream is returning
> a Tuple4.
>
> It's currently working as follows:
>
> inputmetrics = table_env.from_data_stream(ds, Schema.new_builder()
> .column("f0", "BIGINT")
> .column("f1", "STRING")
> .column("f2", "STRING")
> .column("f3", "DOUBLE")
> .build())
>
> I'm trying to rename the columns f0, f1, f2, f3 to proper names e.g.
> timestamp, device, name, value. So far I've tried using from_fields, and
>
> column_by_expression("timestamp", "f0")
>
> I'd prefer not to change the output type of my previous flatMapFunction
> (to say a named Row) for performance purposes.
>
> Thanks,
> Francis
>
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