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https://issues.apache.org/jira/browse/SPARK-14751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281516#comment-15281516
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Sun Rui commented on SPARK-14751:
---------------------------------
if the key type is integer or long, toString works.
[~shivaram] how about add this workaround?
> SparkR fails on Cassandra map with numeric key
> ----------------------------------------------
>
> Key: SPARK-14751
> URL: https://issues.apache.org/jira/browse/SPARK-14751
> Project: Spark
> Issue Type: Bug
> Components: SparkR
> Affects Versions: 1.6.1
> Reporter: Michał Matłoka
>
> Hi,
> I have created an issue for spark cassandra connector (
> https://datastax-oss.atlassian.net/projects/SPARKC/issues/SPARKC-366 ) but
> after a bit of digging it seems this is a better place for this issue:
> {code}
> CREATE TABLE test.map (
> id text,
> somemap map<tinyint, decimal>,
> PRIMARY KEY (id)
> );
> insert into test.map(id, somemap) values ('a', { 0 : 12 });
> {code}
> {code}
> sqlContext <- sparkRSQL.init(sc)
> test <-read.df(sqlContext, source = "org.apache.spark.sql.cassandra",
> keyspace = "test", table = "map")
> head(test)
> {code}
> Results in:
> {code}
> 16/04/19 14:47:02 ERROR RBackendHandler: dfToCols on
> org.apache.spark.sql.api.r.SQLUtils failed
> Error in readBin(con, raw(), stringLen, endian = "big") :
> invalid 'n' argument
> {code}
> Problem occurs even for int key. For text key it works. Every scenario works
> under scala & python.
>
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