[jira] [Created] (SPARK-19950) nullable ignored when df.load() is executed for file-based data source

["Kazuaki Ishizaki (JIRA)" <ji...@apache.org>]

Kazuaki Ishizaki created SPARK-19950:
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             Summary: nullable ignored when df.load() is executed for file-based data source
                 Key: SPARK-19950
                 URL: https://issues.apache.org/jira/browse/SPARK-19950
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: Kazuaki Ishizaki


This problem is reported in [Databricks forum|https://forums.databricks.com/questions/7123/nullable-seemingly-ignored-when-reading-parquet.html].

When we execute the following code, a schema for "id" in {{dfRead}} has {{nullable = true}}. It should be {{nullable = false}}.

{code:java}
val field = "id"
val df = spark.range(0, 5, 1, 1).toDF(field)
val fmt = "parquet"
val path = "/tmp/parquet"
val schema = StructType(Seq(StructField(field, LongType, false)))
df.write.format(fmt).mode("overwrite").save(path)
val dfRead = spark.read.format(fmt).schema(schema).load(path)
dfRead.printSchema
{code}



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