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https://issues.apache.org/jira/browse/SPARK-27609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16882885#comment-16882885
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Maxim Gekk commented on SPARK-27609:
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[~zmjjmz] Please, let us know if you are working on this. If not, I could
prepare a PR.
> from_json expects values of options dictionary to be
> -----------------------------------------------------
>
> Key: SPARK-27609
> URL: https://issues.apache.org/jira/browse/SPARK-27609
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 2.2.1
> Environment: I've found this issue on an AWS Glue development
> endpoint which is running Spark 2.2.1 and being given jobs through a
> SparkMagic Python 2 kernel, running through livy and all that. I don't know
> how much of that is important for reproduction, and can get more details if
> needed.
> Reporter: Zachary Jablons
> Priority: Minor
>
> When reading a column of a DataFrame that consists of serialized JSON, one of
> the options for inferring the schema and then parsing the JSON is to do a two
> step process consisting of:
>
> {code}
> # this results in a new dataframe where the top-level keys of the JSON # are
> columns
> df_parsed_direct = spark.read.json(df.rdd.map(lambda row: row.json_col))
> # this does that while preserving the rest of df
> schema = df_parsed_direct.schema
> df_parsed = df.withColumn('parsed', from_json(df.json_col, schema)
> {code}
> When I do this, I sometimes find myself passing in options. My understanding
> is, from the documentation
> [here|http://spark.apache.org/docs/2.1.0/api/python/pyspark.sql.html#pyspark.sql.functions.from_json],
> that the nature of these options passed should be the same whether I do
> {code}
> spark.read.option('option',value)
> {code}
> or
> {code}
> from_json(df.json_col, schema, options={'option':value})
> {code}
>
> However, I've found that the latter expects value to be a string
> representation of the value that can be decoded by JSON. So, for example
> options=\{'multiLine':True} fails with
> {code}
> java.lang.ClassCastException: java.lang.Boolean cannot be cast to
> java.lang.String
> {code}
> whereas {{options=\{'multiLine':'true'}}} works just fine.
> Notably, providing {{spark.read.option('multiLine',True)}} works fine!
> The code for reproducing this issue as well as the stacktrace from hitting it
> are provided in [this
> gist|https://gist.github.com/zmjjmz/0af5cf9b059b4969951e825565e266aa].
> I also noticed that from_json doesn't complain if you give it a garbage
> option key – but that seems separate.
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