Hi,
Interesting...
I'm temping to think that substring function should accept the columns
that hold the numbers for start and end. I'd love hearing people's
thought on this.
For now, I'd say you need to define udf to do substring as follows:
scala> val mySubstr = udf { (s: String, start: Int, end: Int) =>
s.substring(start, end) }
mySubstr: org.apache.spark.sql.expressions.UserDefinedFunction =
UserDefinedFunction(<function3>,StringType,Some(List(StringType,
IntegerType, IntegerType)))
scala> df.show
+-----------+
| s|
+-----------+
|hello world|
+-----------+
scala> df.select(mySubstr('s, lit(1), instr('s, "ll"))).show
+-----------------------+
|UDF(s, 1, instr(s, ll))|
+-----------------------+
| el|
+-----------------------+
Pozdrawiam,
Jacek Laskowski
----
https://medium.com/@jaceklaskowski/
Mastering Apache Spark 2.0 http://bit.ly/mastering-apache-spark
Follow me at https://twitter.com/jaceklaskowski
On Mon, Aug 1, 2016 at 11:18 PM, Mich Talebzadeh
<mich.talebza...@gmail.com> wrote:
> Thanks Jacek,
>
> Do I have any other way of writing this with functional programming?
>
> select
> substring(transactiondescription,1,INSTR(transactiondescription,'CD')-2),
>
>
> Cheers,
>
>
>
>
>
>
>
>
>
>
>
>
> Dr Mich Talebzadeh
>
>
>
> LinkedIn
> https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw
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> http://talebzadehmich.wordpress.com
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> On 1 August 2016 at 22:13, Jacek Laskowski <ja...@japila.pl> wrote:
>>
>> Hi Mich,
>>
>> There's no indexOf UDF -
>>
>> http://spark.apache.org/docs/latest/api/scala/index.html#org.apache.spark.sql.functions$
>>
>>
>> Pozdrawiam,
>> Jacek Laskowski
>> ----
>> https://medium.com/@jaceklaskowski/
>> Mastering Apache Spark 2.0 http://bit.ly/mastering-apache-spark
>> Follow me at https://twitter.com/jaceklaskowski
>>
>>
>> On Mon, Aug 1, 2016 at 7:24 PM, Mich Talebzadeh
>> <mich.talebza...@gmail.com> wrote:
>> > Hi,
>> >
>> > What is the equivalent of FP for the following window/analytic that
>> > works OK
>> > in Spark SQL
>> >
>> > This one using INSTR
>> >
>> > select
>> >
>> > substring(transactiondescription,1,INSTR(transactiondescription,'CD')-2),
>> >
>> >
>> > select distinct *
>> > from (
>> > select
>> >
>> > substring(transactiondescription,1,INSTR(transactiondescription,'CD')-2),
>> > SUM(debitamount) OVER (PARTITION BY
>> >
>> > substring(transactiondescription,1,INSTR(transactiondescription,'CD')-2))
>> > AS
>> > spent
>> > from accounts.ll_18740868 where transactiontype = 'DEB'
>> > ) tmp
>> >
>> >
>> > I tried indexOf but it does not work!
>> >
>> > val wSpec2 =
>> >
>> > Window.partitionBy(substring(col("transactiondescription"),1,indexOf(col("transactiondescription"),"CD")))
>> > <console>:26: error: not found: value indexOf
>> > val wSpec2 =
>> >
>> > Window.partitionBy(substring(col("transactiondescription"),1,indexOf(col("transactiondescription"),"CD")))
>> >
>> >
>> > Thanks
>> >
>> > Dr Mich Talebzadeh
>> >
>> >
>> >
>> > LinkedIn
>> >
>> > https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw
>> >
>> >
>> >
>> > http://talebzadehmich.wordpress.com
>> >
>> >
>> > Disclaimer: Use it at your own risk. Any and all responsibility for any
>> > loss, damage or destruction of data or any other property which may
>> > arise
>> > from relying on this email's technical content is explicitly disclaimed.
>> > The
>> > author will in no case be liable for any monetary damages arising from
>> > such
>> > loss, damage or destruction.
>> >
>> >
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