Thank you so much! that confuse me quite a time!
> On 2017年7月20日, at 10:43, Hyukjin Kwon <gurwls...@gmail.com> wrote:
>
> Yes, I guess it is.
>
> 2017-07-20 11:31 GMT+09:00 Matthew cao <cybea...@gmail.com
> <mailto:cybea...@gmail.com>>:
> 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
>>>
>>>
>>
>>
>
>
