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https://issues.apache.org/jira/browse/DRILL-6588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16543542#comment-16543542
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ASF GitHub Bot commented on DRILL-6588:
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kkhatua commented on issue #1371: DRILL-6588: Make Sys tables of nullable
datatypes
URL: https://github.com/apache/drill/pull/1371#issuecomment-404909514
Added a unit test that groups and counts the number of IS_NULLABLE values.
Originally, the query would have returned only 1 group (`IS_NULLABLE = false`).
After the patch, there are 2 records for both boolean values.
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> 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
> Fix For: 1.14.0
>
>
> 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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