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https://issues.apache.org/jira/browse/SPARK-22722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16288425#comment-16288425
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Xiao Li commented on SPARK-22722:
---------------------------------
We need to run the same test cases in Hive. Thus, please ensure the queries you
added can be executed in Hive with very trivial changes.
> Test Coverage for Type Coercion Compatibility
> ---------------------------------------------
>
> Key: SPARK-22722
> URL: https://issues.apache.org/jira/browse/SPARK-22722
> Project: Spark
> Issue Type: Umbrella
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Xiao Li
> Assignee: Yuming Wang
>
> Hive compatibility is pretty important for the users who run or migrate both
> Hive and Spark SQL.
> We plan to add a SQLConf for type coercion compatibility
> (spark.sql.typeCoercion.mode). Users can choose Spark's native mode (default)
> or Hive mode (hive).
> Before we deliver the Hive compatibility mode, we plan to write a set of test
> cases that can be easily run in both Spark and Hive sides. We can easily
> compare whether they are the same or not. When new typeCoercion rules are
> added, we also can easily track the changes. These test cases can also be
> backported to the previous Spark versions for determining the changes we
> made.
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