Ok I tried this
def padString(s: String, chars: String, length: Int): String =
| (0 until length).map(_ =>
chars(Random.nextInt(chars.length))).mkString + s
padString: (s: String, chars: String, length: Int)String
And use it like below:
Example left pad the figure 12345.87 with 10 "0"s
padString("12345.87", "0", 10)
res79: String = 000000000012345.87
Any better way?
Thanks
Dr Mich Talebzadeh
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On 25 August 2016 at 12:06, Mich Talebzadeh <mich.talebza...@gmail.com>
wrote:
> Hi,
>
> This UDF on substring works
>
> scala> val SubstrUDF = udf { (s: String, start: Int, end: Int) =>
> s.substring(start, end) }
> SubstrUDF: org.apache.spark.sql.expressions.UserDefinedFunction =
> UserDefinedFunction(<function3>,StringType,Some(List(StringType,
> IntegerType, IntegerType)))
>
> I want something similar to this
>
> scala> sql("""select lpad("str", 10, "0")""").show
> +----------------+
> |lpad(str, 10, 0)|
> +----------------+
> | 0000000str|
> +----------------+
>
> scala> val SubstrUDF = udf { (s: String, len: Int, chars: String) =>
> lpad(s, len, chars) }
> <console>:40: error: type mismatch;
> found : String
> required: org.apache.spark.sql.Column
> val SubstrUDF = udf { (s: String, len: Int, chars: String) =>
> lpad(s, len, chars) }
>
>
> Any ideas?
>
> Thanks
>
> Dr Mich Talebzadeh
>
>
>
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> *Disclaimer:* Use it at your own risk. Any and all responsibility for any
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> 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
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