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https://issues.apache.org/jira/browse/SPARK-19754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890261#comment-15890261
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Takeshi Yamamuro commented on SPARK-19754:
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Aha, I see. I also checked this in v2.0.2;
{code}
Welcome to
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/___/ .__/\_,_/_/ /_/\_\ version 2.0.2
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Using Scala version 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_31)
Type in expressions to have them evaluated.
Type :help for more information.
scala> sql("""SELECT CAST(get_json_object('{"a": 1.6}', '$.a') AS INT)""").show
+---------------------------------------------+
|CAST(get_json_object({"a": 1.6}, $.a) AS INT)|
+---------------------------------------------+
| 2|
+---------------------------------------------+
{code}
It seems some patches change this behaviour.
> Casting to int from a JSON-parsed float rounds instead of truncating
> --------------------------------------------------------------------
>
> Key: SPARK-19754
> URL: https://issues.apache.org/jira/browse/SPARK-19754
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.3, 2.1.0
> Reporter: Juan Pumarino
> Priority: Minor
>
> When retrieving a float value from a JSON document, and then casting it to an
> integer, Hive simply truncates it, while Spark is rounding up when the
> decimal value is >= 5.
> In Hive, the following query returns {{1}}, whereas in a Spark shell the
> result is {{2}}.
> {code}
> SELECT CAST(get_json_object('{"a": 1.6}', '$.a') AS INT)
> {code}
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