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https://issues.apache.org/jira/browse/SPARK-14586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15244986#comment-15244986
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Stephane Maarek commented on SPARK-14586:
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Hi [~tsuresh], thanks for your reply. It makes sense! I'm using Hive 1.2.1.
My only concern is that looking at the code, I understand why the number
wouldn't be parsed correctly in Spark and Hive, but I don't understand why Hive
1.2.1 CLI would parse the number correctly (as seen in my troubleshooting)?
Isn't Spark using the exact same logic as Hive?
> SparkSQL doesn't parse decimal like Hive
> ----------------------------------------
>
> Key: SPARK-14586
> URL: https://issues.apache.org/jira/browse/SPARK-14586
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.5.1
> Reporter: Stephane Maarek
>
> create a test_data.csv with the following
> {code:none}
> a, 2.0
> ,3.0
> {code}
> (the space is intended before the 2)
> copy the test_data.csv to hdfs:///spark_testing_2
> go in hive, run the following statements
> {code:sql}
> CREATE SCHEMA IF NOT EXISTS spark_testing;
> DROP TABLE IF EXISTS spark_testing.test_csv_2;
> CREATE EXTERNAL TABLE `spark_testing.test_csv_2`(
> column_1 varchar(10),
> column_2 decimal(4,2))
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY ','
> STORED AS TEXTFILE LOCATION '/spark_testing_2'
> TBLPROPERTIES('serialization.null.format'='');
> select * from spark_testing.test_csv_2;
> OK
> a 2
> NULL 3
> {code}
> As you can see, the value " 2" gets parsed correctly to 2
> Now onto Spark-shell:
> {code:java}
> val sqlContext = new org.apache.spark.sql.hive.HiveContext(sc)
> sqlContext.sql("select * from spark_testing.test_csv_2").show()
> +--------+--------+
> |column_1|column_2|
> +--------+--------+
> | a| null|
> | null| 3.00|
> +--------+--------+
> {code}
> As you can see, the " 2" got parsed to null. Therefore Hive and Spark don't
> have a similar parsing behavior for decimals. I wouldn't say it is a bug per
> se, but it looks like a necessary improvement for the two engines to
> converge. Hive version is 1.5.1
> Not sure if relevant, but Scala does parse numbers with leading space
> correctly
> {code}
> scala> "2.0".toDouble
> res21: Double = 2.0
> scala> " 2.0".toDouble
> res22: Double = 2.0
> {code}
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