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From Mich Talebzadeh <mich.talebza...@gmail.com>
Subject Re: The equivalent for INSTR in Spark FP
Date Tue, 02 Aug 2016 10:18:52 GMT
Thanks Jared for your kind words. I don't think I am anywhere near there
yet :)

In general I subtract one character before getting to "CD". That is the way
debit from debit cards are marked in a Bank's statement.

I get out of bound error if -->
select(mySubstr($"transactiondescription",lit(0),instr($"transactiondescription",
"CD")-1)   fails with the length. So I did

ll_18740868.where($"transactiontype" === "DEB" && $"transactiondescription"
> "
").select(mySubstr($"transactiondescription",lit(0),instr($"transactiondescription",
"CD")-1),$"debitamount").collect.foreach(println)

which basically examines if the value of $"transactiondescription" > "  "
then do the substring

Now are there better options than that, say make UDF handle the error
when length($"transactiondescription" < 2 or it is null etc and returns
something to avoid the program crashing?

Thanks again for your help.





Dr Mich Talebzadeh



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On 2 August 2016 at 10:57, Jacek Laskowski <jacek@japila.pl> wrote:

> Congrats! You made it. A serious Spark dev badge unlocked :)
>
> 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 Tue, Aug 2, 2016 at 9:58 AM, Mich Talebzadeh
> <mich.talebzadeh@gmail.com> wrote:
> > it should be lit(0) :)
> >
> > rs.select(mySubstr($"transactiondescription", lit(0),
> > instr($"transactiondescription", "CD"))).show(1)
> > +--------------------------------------------------------------+
> > |UDF(transactiondescription,0,instr(transactiondescription,CD))|
> > +--------------------------------------------------------------+
> > |                                          OVERSEAS TRANSACTI C|
> > +--------------------------------------------------------------+
> >
> >
> >
> > 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.
> >
> >
> >
> >
> > On 2 August 2016 at 08:52, Mich Talebzadeh <mich.talebzadeh@gmail.com>
> > wrote:
> >>
> >> No thinking on my part!!!
> >>
> >> rs.select(mySubstr($"transactiondescription", lit(1),
> >> instr($"transactiondescription", "CD"))).show(2)
> >> +--------------------------------------------------------------+
> >> |UDF(transactiondescription,1,instr(transactiondescription,CD))|
> >> +--------------------------------------------------------------+
> >> |                                           VERSEAS TRANSACTI C|
> >> |                                           XYZ.COM 80...|
> >> +--------------------------------------------------------------+
> >> only showing top 2 rows
> >>
> >> Let me test it.
> >>
> >> Cheers
> >>
> >>
> >>
> >> 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.
> >>
> >>
> >>
> >>
> >> On 1 August 2016 at 23:43, Mich Talebzadeh <mich.talebzadeh@gmail.com>
> >> wrote:
> >>>
> >>> Thanks Jacek.
> >>>
> >>> It sounds like the issue the position of the second variable in
> >>> substring()
> >>>
> >>> This works
> >>>
> >>> scala> val wSpec2 =
> >>> Window.partitionBy(substring($"transactiondescription",1,20))
> >>> wSpec2: org.apache.spark.sql.expressions.WindowSpec =
> >>> org.apache.spark.sql.expressions.WindowSpec@1a4eae2
> >>>
> >>> Using udf as suggested
> >>>
> >>> scala> val mySubstr = udf { (s: String, start: Int, end: Int) =>
> >>>      |  s.substring(start, end) }
> >>> mySubstr: org.apache.spark.sql.UserDefinedFunction =
> >>> UserDefinedFunction(<function3>,StringType,List(StringType,
> IntegerType,
> >>> IntegerType))
> >>>
> >>>
> >>> This was throwing error:
> >>>
> >>> val wSpec2 =
> >>>
> Window.partitionBy(substring("transactiondescription",1,indexOf("transactiondescription",'CD')-2))
> >>>
> >>>
> >>> So I tried using udf
> >>>
> >>> scala> val wSpec2 =
> >>> Window.partitionBy($"transactiondescription".select(mySubstr('s,
> lit(1),
> >>> instr('s, "CD")))
> >>>      | )
> >>> <console>:28: error: value select is not a member of
> >>> org.apache.spark.sql.ColumnName
> >>>          val wSpec2 =
> >>> Window.partitionBy($"transactiondescription".select(mySubstr('s,
> lit(1),
> >>> instr('s, "CD")))
> >>>
> >>> Obviously I am not doing correctly :(
> >>>
> >>> cheers
> >>>
> >>>
> >>>
> >>> 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.
> >>>
> >>>
> >>>
> >>>
> >>> On 1 August 2016 at 23:02, Jacek Laskowski <jacek@japila.pl> wrote:
> >>>>
> >>>> 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.talebzadeh@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
> >>>> >
> >>>> >
> >>>> >
> >>>> > 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.
> >>>> >
> >>>> >
> >>>> >
> >>>> >
> >>>> > On 1 August 2016 at 22:13, Jacek Laskowski <jacek@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.talebzadeh@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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