Issue is resolved.   Was not casting to string when fetching from Map.   
    On Saturday, February 9, 2019, 3:09:48 PM PST, Krishnanand Khambadkone 
<kkhambadk...@yahoo.com.INVALID> wrote:  
 
  Hi Kunal,  I am trying to query spark application event json data.  Here is 
my query.   I am using drill version 1.15.0.   I am using a custom UDF in the 
query.

select s.application_id, get_spark_attrs(s.spark_event,'spark.executor.memory') 
as spark_attributes   from dfs.`sparkapplicationevent.json` s where 
(REGEXP_REPLACE(REGEXP_REPLACE(substr(s.spark_event,11), '[^0-9A-Za-z]"', 
''),'(".*)','') = 'SparkListenerEnvironmentUpdate' or 
REGEXP_REPLACE(REGEXP_REPLACE(substr(s.spark_event,11), '[^0-9A-Za-z]"', 
''),'(".*)','') = 'SparkListenerApplicationStart' or 
REGEXP_REPLACE(REGEXP_REPLACE(substr(s.spark_event,11), '[^0-9A-Za-z]"', 
''),'(".*)','') = 'SparkListenerApplicationEnd') group by application_id, 
spark_attributes  order by application_id;


    On Saturday, February 9, 2019, 1:42:57 PM PST, Kunal Khatua 
<ku...@apache.org> wrote:  
 
 This message is eligible for Automatic Cleanup! (ku...@apache.org) Add cleanup 
rule | More info
 Hi Krishnanand

The mailing lists don't allow attachments. Please provide the Drill version, 
query, data source and a link to where the relevant part of the log can be 
downloaded. 

The message by itself is not useful, especially without a stacktrace. 


On 2/9/2019 11:39:49 AM, Krishnanand Khambadkone 
<kkhambadk...@yahoo.com.invalid> wrote:
Any idea why such an error would be thrown from custom UDF. I am using jackson 
json parser in this UDF.

Error: SYSTEM ERROR: CompileException: Line 80, Column 24: Assignment 
conversion not possible from type "java.lang.Object" to type "java.lang.String"




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Please, refer to logs for more information.
    

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