Todd Nemet created SPARK-17818:
----------------------------------
Summary: Cannot SELECT NULL
Key: SPARK-17818
URL: https://issues.apache.org/jira/browse/SPARK-17818
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.0.1, 2.0.0
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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