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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