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https://issues.apache.org/jira/browse/IMPALA-8184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on IMPALA-8184 started by Csaba Ringhofer.
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> Add timestamp validation to Orc scanner
> ---------------------------------------
>
> Key: IMPALA-8184
> URL: https://issues.apache.org/jira/browse/IMPALA-8184
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Csaba Ringhofer
> Assignee: Csaba Ringhofer
> Priority: Critical
>
> Similarly to Parquet, Orc can also contain timestamps that are not valid in
> Impala, e.g. Hive can insert timestamps before 1400 while these are invalid
> in Impala. These invalid timestamps are often handled similarly to NULL, bur
> are actually not "real" NULLs, which can lead to some some weird behavior:
> Hive:
> create table orcts (ts timestamp) stored as orc;
> insert into orcts values ("1200-01-01");
> Impala:
> select * from orcts where ts is not null;
> Returns 1 row:
> NULL
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