Tim Armstrong created IMPALA-8891:
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Summary: concat_ws() null handling is non-standard
Key: IMPALA-8891
URL: https://issues.apache.org/jira/browse/IMPALA-8891
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 3.2.0, Impala 3.3.0
Reporter: Tim Armstrong
[~grahn] reports
{quote}Looks like Impala’s CONCAT_WS() does not behave correctly if an argument
is NULL — it returns NULL and it should not. Mismatch between Hive/MySQL and
Impala (and apologies for not filing a bug)
{quote}
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