[jira] [Resolved] (SPARK-14655) Add `assert_true` function

["Reynold Xin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-14655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin resolved SPARK-14655.
---------------------------------
       Resolution: Fixed
         Assignee: Dongjoon Hyun
    Fix Version/s: 2.0.0

> Add `assert_true` function
> --------------------------
>
>                 Key: SPARK-14655
>                 URL: https://issues.apache.org/jira/browse/SPARK-14655
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Dongjoon Hyun
>            Assignee: Dongjoon Hyun
>             Fix For: 2.0.0
>
>
> This issue aims to implement `assert_true` function. It's [Hive Generic UDF Function|https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFAssertTrue.java] since 1.2. The following is function description of Hive 1.2.
> {code}
> hive> desc function assert_true;
> OK
> assert_true(condition) - Throw an exception if 'condition' is not true.
> {code}
> {code}
> scala> sql("desc function assert_true").collect().foreach(println)
> [Function: assert_true]
> [Class: org.apache.spark.sql.catalyst.expressions.AssertTrue]
> [Usage: assert_true(condition) - Throw an exception if 'condition' is not true.]
> {code}
> Please note that Hive's false values are *false*, *0*, *null*, and *""* (empty string).
> *But, in Spark, we intentionally designed to use implicit typecasting to BooleanType.*



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