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https://issues.apache.org/jira/browse/SPARK-20528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley updated SPARK-20528:
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Description:
It would be very useful to have a binary data reader/writer for DataFrames,
presumably called via {{spark.read.binaryFiles}}, etc.
Currently, going through RDDs is annoying since it requires different code
paths for Scala vs Python:
Scala:
{code}
val binaryFilesRDD = sc.binaryFiles("mypath")
val binaryFilesDF = spark.createDataFrame(binaryFilesRDD)
{code}
Python:
{code}
binaryFilesRDD = sc.binaryFiles("mypath")
binaryFilesRDD_recast = binaryFilesRDD.map(lambda x: (x[0], bytearray(x[1])))
binaryFilesDF = spark.createDataFrame(binaryFilesRDD_recast)
{code}
This is because Scala and Python {{sc.binaryFiles}} return different types,
which makes sense in RDD land but not DataFrame land.
My motivation here is working with images in Spark.
was:
It would be very useful to have a binary data reader/writer for DataFrames,
presumably called via {{spark.read.binaryFiles}}, etc.
Currently, going through RDDs is annoying since it requires different code
paths for Scala vs Python:
Scala:
{code}
val binaryFilesRDD = sc.binaryFiles("mypath")
val binaryFilesDF = spark.createDataFrame(binaryFilesRDD)
{code}
Python:
{code}
binaryFilesRDD = sc.binaryFiles("mypath")
binaryFilesRDD_recast = binaryFilesRDD.map(lambda x: (x[0], bytearray(x[1])))
binaryFilesDF = spark.createDataFrame(binaryFilesRDD_recast)
{code}
This is because Scala and Python {{sc.binaryFiles}} return different types,
which makes sense in RDD land but not DataFrame land.
> Add BinaryFileReader and Writer for DataFrames
> ----------------------------------------------
>
> Key: SPARK-20528
> URL: https://issues.apache.org/jira/browse/SPARK-20528
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Joseph K. Bradley
>
> It would be very useful to have a binary data reader/writer for DataFrames,
> presumably called via {{spark.read.binaryFiles}}, etc.
> Currently, going through RDDs is annoying since it requires different code
> paths for Scala vs Python:
> Scala:
> {code}
> val binaryFilesRDD = sc.binaryFiles("mypath")
> val binaryFilesDF = spark.createDataFrame(binaryFilesRDD)
> {code}
> Python:
> {code}
> binaryFilesRDD = sc.binaryFiles("mypath")
> binaryFilesRDD_recast = binaryFilesRDD.map(lambda x: (x[0], bytearray(x[1])))
> binaryFilesDF = spark.createDataFrame(binaryFilesRDD_recast)
> {code}
> This is because Scala and Python {{sc.binaryFiles}} return different types,
> which makes sense in RDD land but not DataFrame land.
> My motivation here is working with images in Spark.
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