AH, I get it. So that’s why I get the not register error? Cuz it not added into
SQL in 2.1.0?
> On 2017年7月19日, at 22:35, Hyukjin Kwon <gurwls...@gmail.com
> <mailto:gurwls...@gmail.com>> wrote:
>
> Yea, but it was added into SQL from Spark 2.2.0
>
> 2017-07-19 23:02 GMT+09:00 Matthew cao <cybea...@gmail.com
> <mailto:cybea...@gmail.com>>:
> I am using version 2.1.1 As I could remember, this function was added since
> 2.1.0.
>
>> On 2017年7月17日, at 12:05, Burak Yavuz <brk...@gmail.com
>> <mailto:brk...@gmail.com>> wrote:
>>
>> Hi Matthew,
>>
>> Which Spark version are you using? The expression `to_json` was added in 2.2
>> with this commit:
>> https://github.com/apache/spark/commit/0cdcf9114527a2c359c25e46fd6556b3855bfb28
>>
>> <https://github.com/apache/spark/commit/0cdcf9114527a2c359c25e46fd6556b3855bfb28>
>>
>> Best,
>> Burak
>>
>> On Sun, Jul 16, 2017 at 6:24 PM, Matthew cao <cybea...@gmail.com
>> <mailto:cybea...@gmail.com>> wrote:
>> Hi all,
>> I just read the databricks blog here:
>> https://docs.databricks.com/_static/notebooks/complex-nested-structured.html
>> <https://docs.databricks.com/_static/notebooks/complex-nested-structured.html>
>>
>> When I try to follow the example about the to_json and selectExpr part, it
>> gave error: “org.apache.spark.sql.AnalysisException: Undefined function:
>> 'to_json'. This function is neither a registered temporary function nor a
>> permanent function registered in the database 'default'.; line 1 pos 0”.
>> Also this error show in the original databricks notebook. I know that
>> to_json function works great with select. Do I miss something when using
>> selectExpr? THX.
>>
>> Best,
>> Matthew
>>
>>
>
>
