[jira] [Assigned] (SPARK-6647) Make trait StringComparison as BinaryPredicate and throw error when Predicate can't translate to data source Filter

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-6647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-6647:
-----------------------------------

    Assignee: Apache Spark

> Make trait StringComparison as BinaryPredicate and throw error when Predicate can't translate to data source Filter
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-6647
>                 URL: https://issues.apache.org/jira/browse/SPARK-6647
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Liang-Chi Hsieh
>            Assignee: Apache Spark
>
> Now trait {{StringComparison}} is a {{BinaryExpression}}. In fact, it should be a {{BinaryPredicate}}.
> By making {{StringComparison}} as {{BinaryPredicate}}, we can throw error when a {{expressions.Predicate}} can't translate to a data source {{Filter}} in function {{selectFilters}}.
> Without this modification, because we will wrap a {{Filter}} outside the scanned results in {{pruneFilterProjectRaw}}, we can't detect about something is wrong in translating predicates to filters in {{selectFilters}}.
> The unit test of SPARK-6625 demonstrates such problem. In that pr, even {{expressions.Contains}} is not properly translated to {{sources.StringContains}}, the filtering is still performed by the {{Filter}} and so the test passes.
> Of course, by doing this modification, all {{expressions.Predicate}} classes need to have its data source {{Filter}} correspondingly.



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