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https://issues.apache.org/jira/browse/SPARK-34993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17319958#comment-17319958
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Kousuke Saruta commented on SPARK-34993:
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Hi [~laurikoobas].
I think all of the results is correct.
About the following two expressions, '\{"msg": " "}' is a string literal and
"\\" is regarded as "\".
{code:java}
from_json('{"msg":"\\"}', schema_of_json(to_json(named_struct('msg', '\\'))))
from_json('{"msg":"\\"}', 'msg string')
{code}
So, if you need to give an escaped character like "\\", you should write "\\\\".
In this case, those expression should be:
{code:java}
from_json('{"msg":"\\\\"}', schema_of_json(to_json(named_struct('msg', '\\'))))
from_json('{"msg":"\\\\"}', 'msg string')
{code}
About thefollowing expression,
from_json(to_json(named_struct('msg', '\\')),
schema_of_json(to_json(named_struct('msg', '\\'))))
The evaluated result is \{"msg":"\"} in my Spark 3.1.1 environment. It seems to
be different from the result you get (\{"msg":"\\"}) but it should be \{"msg":
"\"}.
> 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
> Attachments: image-2021-04-11-07-21-02-750.png
>
>
> 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}
>
> !image-2021-04-11-07-21-02-750.png!
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