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https://issues.apache.org/jira/browse/ARROW-10970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17252294#comment-17252294
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Mike Seddon commented on ARROW-10970:
-------------------------------------
Added as part of https://github.com/apache/arrow/pull/8966
For future reference:
I have now added the NULL value to both the test cases and the planner.
This is where things get interesting. For this statement:
SELECT NULL
Spark implements a special NullType for this return type but that creates a lot
of side effects for things like the Parquet writer and JDBC drivers do not
support this type.
I tested Postgres:
CREATE TABLE test AS
SELECT NULL;
The DDL for this table shows that column as a text type so that is why I have
applied the default utf8 type to Value(Null).
> [Rust][DataFusion] Implement Value(Null)
> ----------------------------------------
>
> Key: ARROW-10970
> URL: https://issues.apache.org/jira/browse/ARROW-10970
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust - DataFusion
> Reporter: Mike Seddon
> Priority: Major
>
> We need to add support for the NULL value.
> For example:
> ```sql
> SELECT char_length(NULL) AS char_length_null
> ```
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