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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-16700) StructType doesn't accept Python dicts anymore
Date Tue, 02 Aug 2016 23:51:20 GMT

    [ https://issues.apache.org/jira/browse/SPARK-16700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15405044#comment-15405044
] 

Apache Spark commented on SPARK-16700:
--------------------------------------

User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/14469

> StructType doesn't accept Python dicts anymore
> ----------------------------------------------
>
>                 Key: SPARK-16700
>                 URL: https://issues.apache.org/jira/browse/SPARK-16700
>             Project: Spark
>          Issue Type: Bug
>          Components: PySpark
>    Affects Versions: 2.0.0
>            Reporter: Sylvain Zimmer
>
> Hello,
> I found this issue while testing my codebase with 2.0.0-rc5
> StructType in Spark 1.6.2 accepts the Python <dict> type, which is very handy.
2.0.0-rc5 does not and throws an error.
> I don't know if this was intended but I'd advocate for this behaviour to remain the same.
MapType is probably wasteful when your key names never change and switching to Python tuples
would be cumbersome.
> Here is a minimal script to reproduce the issue: 
> {code}
> from pyspark import SparkContext
> from pyspark.sql import types as SparkTypes
> from pyspark.sql import SQLContext
> sc = SparkContext()
> sqlc = SQLContext(sc)
> struct_schema = SparkTypes.StructType([
>     SparkTypes.StructField("id", SparkTypes.LongType())
> ])
> rdd = sc.parallelize([{"id": 0}, {"id": 1}])
> df = sqlc.createDataFrame(rdd, struct_schema)
> print df.collect()
> # 1.6.2 prints [Row(id=0), Row(id=1)]
> # 2.0.0-rc5 raises TypeError: StructType can not accept object {'id': 0} in type <type
'dict'>
> {code}
> Thanks!



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