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Posted to issues@drill.apache.org by "Kunal Khatua (JIRA)" <ji...@apache.org> on 2018/07/09 23:34:00 UTC
[jira] [Assigned] (DRILL-6588) System table columns incorrectly
marked as non-nullable
[ https://issues.apache.org/jira/browse/DRILL-6588?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kunal Khatua reassigned DRILL-6588:
-----------------------------------
Assignee: Kunal Khatua
> System table columns incorrectly marked as non-nullable
> --------------------------------------------------------
>
> Key: DRILL-6588
> URL: https://issues.apache.org/jira/browse/DRILL-6588
> Project: Apache Drill
> Issue Type: Bug
> Components: Metadata
> Affects Versions: 1.13.0
> Reporter: Aman Sinha
> Assignee: Kunal Khatua
> Priority: Major
>
> System table columns can contain null values but they are incorrectly marked as non-nullable as shown in example table below:
> {noformat}
> 0: jdbc:drill:drillbit=10.10.10.191> describe sys.boot;
> +-------------------+--------------------+--------------+
> | COLUMN_NAME | DATA_TYPE | IS_NULLABLE |
> +-------------------+--------------------+--------------+
> | name | CHARACTER VARYING | NO |
> | kind | CHARACTER VARYING | NO |
> | accessibleScopes | CHARACTER VARYING | NO |
> | optionScope | CHARACTER VARYING | NO |
> | status | CHARACTER VARYING | NO |
> | num_val | BIGINT | NO |
> | string_val | CHARACTER VARYING | NO |
> | bool_val | BOOLEAN | NO |
> | float_val | DOUBLE | NO |
> +-------------------+--------------------+--------------+{noformat}
>
> Note that several columns are nulls:
> {noformat}
> +---------------------------------------------------+----------+------------------+-------------+--------+---------+------------+----------+-----------+
> | name | kind | accessibleScopes | optionScope | status | num_val | string_val | bool_val | float_val |
> +---------------------------------------------------+----------+------------------+-------------+--------+---------+------------+----------+-----------+
> drill.exec.options.exec.udf.enable_dynamic_support | BOOLEAN | BOOT | BOOT | BOOT | null | null | true | null |{noformat}
>
> Because of the not-null metadata, the predicates on these tables such as `WHERE <column> IS NULL` evaluate to FALSE which is incorrect.
>
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