Thanks Mike.
Can one turn the first example into a generic UDF similar to the output
from below where 10 "0" are padded to the left of 123
def padString(id: Int, chars: String, length: Int): String =
(0 until length).map(_ =>
chars(Random.nextInt(chars.length))).mkString + id.toString
scala> padString(123, "0", 10)
res6: String = 0000000000123
Cheers
Dr Mich Talebzadeh
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On 25 August 2016 at 17:29, Mike Metzger <m...@flexiblecreations.com> wrote:
> Are you trying to always add x numbers of digits / characters or are you
> trying to pad to a specific length? If the latter, try using format
> strings:
>
> // Pad to 10 0 characters
> val c = 123
> f"$c%010d"
>
> // Result is 0000000123
>
>
> // Pad to 10 total characters with 0's
> val c = 123.87
> f"$c%010.2f"
>
> // Result is 0000123.87
>
>
> You can also do inline operations on the values before formatting. I've
> used this specifically to pad for hex digits from strings.
>
> val d = "100"
> val hexstring = f"0x${d.toInt}%08X"
>
> // hexstring is 0x00000064
>
>
> Thanks
>
> Mike
>
> On Thu, Aug 25, 2016 at 9:27 AM, Mich Talebzadeh <
> mich.talebza...@gmail.com> wrote:
>
>> 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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>> arise from relying on this email's technical content is explicitly
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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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>>
>>
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