[jira] [Commented] (SPARK-34993) from_json() acts differently on created and literal strings with backslashes

["Hyukjin Kwon (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-34993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17318642#comment-17318642 ] 

Hyukjin Kwon commented on SPARK-34993:
--------------------------------------

It would be great to share the current output of that code so people don't have to run them manually to see the output.

> from_json() acts differently on created and literal strings with backslashes
> ----------------------------------------------------------------------------
>
>                 Key: SPARK-34993
>                 URL: https://issues.apache.org/jira/browse/SPARK-34993
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.1.1
>         Environment: Databricks DBR 8.1
>            Reporter: Lauri Koobas
>            Priority: Major
>
> JSON string with the value that contains backslashes fails to be recovered by `from_json()`.
> I found that if the same string is created with `to_json(named_struct())` then it actually does work.
>  
> The following code to reproduce. I would expect all of these methods to return the same (correct) result:
> {code:java}
> select to_json(named_struct('msg', '\\'))
>  , schema_of_json(to_json(named_struct('msg', '\\')))
>  , from_json(to_json(named_struct('msg', '\\')), schema_of_json(to_json(named_struct('msg', '\\'))))
>  , from_json('{"msg":"\\"}', schema_of_json(to_json(named_struct('msg', '\\'))))
>  , from_json('{"msg":"\\"}', 'msg string')
>  
> {code}
>  



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