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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/04/25 05:45:00 UTC
[jira] [Resolved] (SPARK-27559) Nullable in a given schema is not
respected when reading from parquet
[ https://issues.apache.org/jira/browse/SPARK-27559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon resolved SPARK-27559.
----------------------------------
Resolution: Duplicate
> Nullable in a given schema is not respected when reading from parquet
> ---------------------------------------------------------------------
>
> Key: SPARK-27559
> URL: https://issues.apache.org/jira/browse/SPARK-27559
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.2
> Reporter: colin fang
> Priority: Minor
>
> Even if I specify a schema when reading from parquet, nullable is not reset.
> {code:java}
> spark.range(10, numPartitions=1).write.mode('overwrite').parquet('tmp')
> df1 = spark.read.parquet('tmp')
> df1.printSchema()
> # root
> # |-- id: long (nullable = true)
> df2 = spark.read.schema(StructType([StructField('id', LongType(), False)])).parquet('tmp')
> df2.printSchema()
> # root
> # |-- x: long (nullable = true)
> {code}
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