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https://issues.apache.org/jira/browse/SPARK-11657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15000840#comment-15000840
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Virgil Palanciuc commented on SPARK-11657:
------------------------------------------
On the simple example:
{code}
> val df = sc.makeRDD(Seq("20206E25479B5C67992015A9")).toDF()
df: org.apache.spark.sql.DataFrame = [_1: string]
> df.show()
+--------------------+
| _1|
+--------------------+
|479B5C67992015A9...|
+--------------------+
> df.take(2)
res1: Array[org.apache.spark.sql.Row] = Array([479B5C67992015A9????????])
{code}
also:
{code}
== Parsed Logical Plan ==
Limit 21
LogicalRDD [_1#1], MapPartitionsRDD[5] at stringRddToDataFrameHolder at
<console>:21
== Analyzed Logical Plan ==
_1: string
Limit 21
LogicalRDD [_1#1], MapPartitionsRDD[5] at stringRddToDataFrameHolder at
<console>:21
== Optimized Logical Plan ==
Limit 21
LogicalRDD [_1#1], MapPartitionsRDD[5] at stringRddToDataFrameHolder at
<console>:21
== Physical Plan ==
Limit 21
Scan PhysicalRDD[_1#1]
Code Generation: true
{code}
> Bad Dataframe data read from parquet
> ------------------------------------
>
> Key: SPARK-11657
> URL: https://issues.apache.org/jira/browse/SPARK-11657
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, SQL
> Affects Versions: 1.5.1, 1.5.2
> Environment: EMR (yarn)
> Reporter: Virgil Palanciuc
> Priority: Critical
> Attachments: sample.tgz
>
>
> I get strange behaviour when reading parquet data:
> {code}
> scala> val data = sqlContext.read.parquet("hdfs:///sample")
> data: org.apache.spark.sql.DataFrame = [clusterSize: int, clusterName:
> string, clusterData: array<string>, dpid: int]
> scala> data.take(1) /// this returns garbage
> res0: Array[org.apache.spark.sql.Row] =
> Array([1,56169A947F000101????????,WrappedArray(164594606101815510825479776971????????),813])
>
> scala> data.collect() /// this works
> res1: Array[org.apache.spark.sql.Row] =
> Array([1,6A01CACD56169A947F000101,WrappedArray(77512098164594606101815510825479776971),813])
> {code}
> I've attached the "hdfs:///sample" directory to this bug report
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