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https://issues.apache.org/jira/browse/DRILL-6588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16539802#comment-16539802
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ASF GitHub Bot commented on DRILL-6588:
---------------------------------------

arina-ielchiieva commented on a change in pull request #1371: DRILL-6588: Make 
Sys tables of nullable datatypes
URL: https://github.com/apache/drill/pull/1371#discussion_r201623807
 
 

 ##########
 File path: 
exec/java-exec/src/main/java/org/apache/drill/exec/store/RecordDataType.java
 ##########
 @@ -47,17 +48,22 @@
    * @return the constructed type
    */
   public final RelDataType getRowType(RelDataTypeFactory factory) {
-    final List<SqlTypeName> types = getFieldSqlTypeNames();
+    final List<ImmutablePair<SqlTypeName, Boolean>> types = 
getFieldSqlTypeNames();
 
 Review comment:
   I also agree with Paul, using Pair is not a good choice. Better to introduce 
holder class. 

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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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