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Date: Sun, 20 Sep 2015 19:13:04 +0000 (UTC)
From: "Reynold Xin (JIRA)" <jira@apache.org>
To: issues@spark.apache.org
Message-ID: <JIRA.12863851.1442230713000.23948.1442776384137@Atlassian.JIRA>
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 <JIRA.12863851.1442230713534@arcas>
Subject: [jira] [Updated] (SPARK-10588) Saving a DataFrame containing only
 nulls to JSON doesn't work
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     [ https://issues.apache.org/jira/browse/SPARK-10588?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin updated SPARK-10588:
--------------------------------
    Target Version/s: 1.6.0  (was: 1.6.0, 1.5.1)

> Saving a DataFrame containing only nulls to JSON doesn't work
> -------------------------------------------------------------
>
>                 Key: SPARK-10588
>                 URL: https://issues.apache.org/jira/browse/SPARK-10588
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.5.0
>            Reporter: Cheng Lian
>            Priority: Minor
>
> Snippets to reproduce this issue:
> {noformat}
> val path = "file:///tmp/spark/null"
> // A single row containing a single null double, saving to JSON, wrong
> sqlContext.
>   range(1).selectExpr("CAST(NULL AS DOUBLE) AS c0").
>   write.mode("overwrite").json(path)
> sqlContext.read.json(path).show()
> ++
> ||
> ++
> ||
> ++
> // Two rows each containing a single null double, saving to JSON, wrong
> sqlContext.
>   range(2).selectExpr("CAST(NULL AS DOUBLE) AS c0").
>   write.mode("overwrite").json(path)
> sqlContext.read.json(path).show()
> ++
> ||
> ++
> ||
> ||
> ++
> // A single row containing two null doubles, saving to JSON, wrong
> sqlContext.
>   range(1).selectExpr("CAST(NULL AS DOUBLE) AS c0", "CAST(NULL AS DOUBLE) AS c1").
>   write.mode("overwrite").json(path)
> sqlContext.read.json(path).show()
> ++
> ||
> ++
> ||
> ++
> // A single row containing a single null double, saving to Parquet, OK
> sqlContext.
>   range(1).selectExpr("CAST(NULL AS DOUBLE) AS c0").
>   write.mode("overwrite").parquet(path)
> sqlContext.read.parquet(path).show()
> +----+
> |   d|
> +----+
> |null|
> +----+
> // Two rows, one containing a single null double, one containing non-null double, saving to JSON, OK
> sqlContext.
>   range(2).selectExpr("IF(id % 2 = 0, CAST(NULL AS DOUBLE), id) AS c0").
>   write.mode("overwrite").json(path)
> sqlContext.read.json(path).show()
> +----+
> |   d|
> +----+
> |null|
> | 1.0|
> +----+
> {noformat}


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