You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@spark.apache.org by "Don Drake (JIRA)" <ji...@apache.org> on 2015/02/10 22:10:15 UTC
[jira] [Updated] (SPARK-5722) Infer_schema_type incorrect for
Integers in pyspark
[ https://issues.apache.org/jira/browse/SPARK-5722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Don Drake updated SPARK-5722:
-----------------------------
Summary: Infer_schema_type incorrect for Integers in pyspark (was: Infer_schma_type incorrect for Integers in pyspark)
> Infer_schema_type incorrect for Integers in pyspark
> ---------------------------------------------------
>
> Key: SPARK-5722
> URL: https://issues.apache.org/jira/browse/SPARK-5722
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 1.2.0
> Reporter: Don Drake
>
> The Integers datatype in Python does not match what a Scala/Java integer is defined as. This causes inference of data types and schemas to fail when data is larger than 2^32 and it is inferred incorrectly as an Integer.
> Since the range of valid Python integers is wider than Java Integers, this causes problems when inferring Integer vs. Long datatypes. This will cause problems when attempting to save SchemaRDD as Parquet or JSON.
> Here's an example:
> >>> sqlCtx = SQLContext(sc)
> >>> from pyspark.sql import Row
> >>> rdd = sc.parallelize([Row(f1='a', f2=100000000000000)])
> >>> srdd = sqlCtx.inferSchema(rdd)
> >>> srdd.schema()
> StructType(List(StructField(f1,StringType,true),StructField(f2,IntegerType,true)))
> That number is a LongType in Java, but an Integer in python. We need to check the value to see if it should really by a LongType when a IntegerType is initially inferred.
> More tests:
> >>> from pyspark.sql import _infer_type
> # OK
> >>> print _infer_type(1)
> IntegerType
> # OK
> >>> print _infer_type(2**31-1)
> IntegerType
> #WRONG
> >>> print _infer_type(2**31)
> #WRONG
> IntegerType
> >>> print _infer_type(2**61 )
> #OK
> IntegerType
> >>> print _infer_type(2**71 )
> LongType
> Java Primitive Types defined:
> http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html
> Python Built-in Types:
> https://docs.python.org/2/library/stdtypes.html#typesnumeric
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org