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https://issues.apache.org/jira/browse/IMPALA-7679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fredy Wijaya resolved IMPALA-7679.
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Resolution: Fixed
Fix Version/s: Impala 3.2.0
> Improve error message and add test for creating table with NULL column
> ----------------------------------------------------------------------
>
> Key: IMPALA-7679
> URL: https://issues.apache.org/jira/browse/IMPALA-7679
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 2.12.0
> Reporter: Tim Armstrong
> Assignee: Fredy Wijaya
> Priority: Major
> Labels: newbie, ramp-up
> Fix For: Impala 3.2.0
>
>
> [~alanj_impala_5a78] reports that the error message was a little confusing
> here:
> {noformat}
> [localhost:21000] default> create table test_null_field as select null as
> null_field;
> Query: create table test_null_field as select null as null_field
> Query submitted at: 2018-10-08 12:18:40 (Coordinator:
> http://tarmstrong-box:25000)
> ERROR: AnalysisException: Unsupported type 'null_type' in column 'null_field'
> of table 'test_null_field'
> CAUSED BY: TableLoadingException: Unsupported type 'null_type' in column
> 'null_field' of table 'test_null_field'
> {noformat}
> The error message should be a little clearer about what the problem is (we
> can't infer the type for a NULL column without a cast) and maybe suggest a
> solution.
> I grepped the code and it doesn't look like we actually have a targeted test,
> so we should add the coverage too.
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