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From Eric Chaves <e...@uolet.com>
Subject Re: What UDFs are supported by QueryRecord?
Date Thu, 17 Oct 2019 20:49:36 GMT
Hi mark,

Thanks for pointing that out but from the docs I only got how to use RPATH
to get a RecordPath value. How should I do for example if I wanted to apply
a RecordPath function to in a Record Field?

Em qui, 17 de out de 2019 às 14:57, Mark Payne <markap14@hotmail.com>
escreveu:

> Eric,
>
> You can use RecordPath with QueryRecord, via the RPATH, RPATH_STRING,
> RPATH_INT, etc. These are explained in the Processor's documentation. For
> example, see [1].
>
> You can also use the Expression Language with QueryRecord. The Expression
> Language is evaluated before the SQL is parsed. So, for example, if you had
> an attribute named 'Field of Interest' you could actually use SQL like:
>
> SELECT ${'Field of Interest'}
> FROM FLOWFILE
>
> Thanks
> -Mark
>
> [1]
> http://nifi.apache.org/docs/nifi-docs/components/org.apache.nifi/nifi-standard-nar/1.9.2/org.apache.nifi.processors.standard.QueryRecord/index.html
>
> On Oct 16, 2019, at 2:10 PM, Eric Chaves <eric@uolet.com> wrote:
>
> Ok, figured out a way to do it. I noticed that QueryRecord uses Apache
> Calcite so I tried some of Calcite functions until I got into this
> statement that seems to work:
>
> SELECT index FROM FLOWFILE WHERE CAST( SUBSTRING(index FROM
> CHAR_LENGTH(index)-9) AS DATE) <= CURRENT_DATE
>
> Anyhow, I would still like to know if (and how) I could use either NiFi
> expression or RecordPath functions in a QueryRecord statement.
>
> Thanks in advance,
>
> Em qua, 16 de out de 2019 às 14:30, Eric Chaves <eric@uolet.com> escreveu:
>
>> Hi Folks,
>>
>> I'd like to use a SQL statement in QueryRecords like this uses the
>> extract the last 10 chars of  field and compare it to today, similar to the
>> line below:
>>
>> SELECT substring( '/index', 10, -1) as expired FROM FLOWFILE WHERE
>> expired <= '${now():format("yyyy-MM-dd")}'
>>
>> This statement is not work and I can't find a list of QueryRecord
>> supported UDF or if (nd how) I can use RecordPath functions.
>>
>> Is there any documentation where I can see the available UDFs?
>>
>> Regards,
>>
>>
>

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