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Posted to issues@arrow.apache.org by "Andrew Lamb (Jira)" <ji...@apache.org> on 2020/10/02 18:11:00 UTC

[jira] [Created] (ARROW-10165) [Rust] [DataFusion] Add DictionaryArray coercion support

Andrew Lamb created ARROW-10165:
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             Summary: [Rust] [DataFusion] Add DictionaryArray coercion support
                 Key: ARROW-10165
                 URL: https://issues.apache.org/jira/browse/ARROW-10165
             Project: Apache Arrow
          Issue Type: Sub-task
            Reporter: Andrew Lamb
            Assignee: Andrew Lamb


There is code in the datafusion physical planner that coerces arguments to compatible types for some expressions (e.g. for equals: https://github.com/apache/arrow/blob/master/rust/datafusion/src/physical_plan/expressions.rs#L1153)

This code needs to be modified to understand dictionary types (so, for example we can express a predicate like {{col1 = "foo"}}, where {{col1}} is a DictionaryArray. 




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