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https://issues.apache.org/jira/browse/SPARK-17818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15553732#comment-15553732
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Dongjoon Hyun commented on SPARK-17818:
---------------------------------------
{code}
Connected to: Spark SQL (version 2.1.0-SNAPSHOT)
Driver: Hive JDBC (version 1.2.1)
Transaction isolation: TRANSACTION_REPEATABLE_READ
0: jdbc:hive2://localhost:10000> select null;
+-------+--+
| NULL |
+-------+--+
| NULL |
+-------+--+
1 row selected (0.148 seconds)
0: jdbc:hive2://localhost:10000> select null=null;
+----------------+--+
| (NULL = NULL) |
+----------------+--+
| NULL |
+----------------+--+
1 row selected (0.099 seconds)
0: jdbc:hive2://localhost:10000> select cast(NULL as int);
+--------------------+--+
| CAST(NULL AS INT) |
+--------------------+--+
| NULL |
+--------------------+--+
1 row selected (0.084 seconds)
0: jdbc:hive2://localhost:10000> select cast(NULL as string);
+-----------------------+--+
| CAST(NULL AS STRING) |
+-----------------------+--+
| NULL |
+-----------------------+--+
1 row selected (0.076 seconds)
{code}
> Cannot SELECT NULL
> ------------------
>
> Key: SPARK-17818
> URL: https://issues.apache.org/jira/browse/SPARK-17818
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0, 2.0.1
> Reporter: Todd Nemet
>
> When connecting to Spark SQL via JDBC/thriftserver, running `SELECT NULL`
> returns this error:
> {code}
> 0: jdbc:hive2://localhost:10016/> select cast(NULL as NULL);
> Error: org.apache.spark.sql.catalyst.parser.ParseException:
> DataType null() is not supported.(line 1, pos 20)
> {code}
> This is a regression from Spark 1.x/Hive QL compatibility. In Spark 1.5.2,
> The same query returns NULL:
> {code}
> 0: jdbc:hive2://localhost:10015/> select null;
> +-------+--+
> | _c0 |
> +-------+--+
> | NULL |
> +-------+--+
> 1 row selected (0.658 seconds)
> {code}
> I can select expressions that evaluate to NULL or CAST NULL to different
> types:
> {code}
> 0: jdbc:hive2://localhost:10016/> select null=null
> 0: jdbc:hive2://localhost:10016/> ;
> +----------------+--+
> | (NULL = NULL) |
> +----------------+--+
> | NULL |
> +----------------+--+
> 1 row selected (0.69 seconds)
> 0: jdbc:hive2://localhost:10016/> select cast (NULL as int);
> +--------------------+--+
> | CAST(NULL AS INT) |
> +--------------------+--+
> | NULL |
> +--------------------+--+
> 1 row selected (0.676 seconds)
> 0: jdbc:hive2://localhost:10016/> select cast (NULL as string);
> +-----------------------+--+
> | CAST(NULL AS STRING) |
> +-----------------------+--+
> | NULL |
> +-----------------------+--+
> {code}
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