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https://issues.apache.org/jira/browse/IMPALA-1370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17949830#comment-17949830
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ASF subversion and git services commented on IMPALA-1370:
---------------------------------------------------------
Commit cb496104d98e8cbd87acf25277f2648cffaac42a in impala's branch
refs/heads/master from Riza Suminto
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=cb496104d ]
IMPALA-14027: Implement HS2 NULL_TYPE using TStringValue
HS2 NULL_TYPE should be implemented using TStringValue.
However, due to incompatibility with Hive JDBC driver implementation
then, Impala choose to implement NULL type using TBoolValue (see
IMPALA-914, IMPALA-1370).
HIVE-4172 might be the root cause for such decision. Today, the Hive
JDBC (org.apache.hive.jdbc.HiveDriver) does not have that issue anymore,
as shown in this reproduction after applying this patch:
./bin/run-jdbc-client.sh -q "select null" -t NOSASL
Using JDBC Driver Name: org.apache.hive.jdbc.HiveDriver
Connecting to: jdbc:hive2://localhost:21050/;auth=noSasl
Executing: select null
----[START]----
NULL
----[END]----
Returned 1 row(s) in 0.343s
Thus, we can reimplement NULL_TYPE using TStringValue to match
HiveServer2 behavior.
Testing:
- Pass core tests.
Change-Id: I354110164b360013d9893f1eb4398c3418f80472
Reviewed-on: http://gerrit.cloudera.org:8080/22852
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> "SELECT null" returns result in stringVal in HS2 protocol V6
> ------------------------------------------------------------
>
> Key: IMPALA-1370
> URL: https://issues.apache.org/jira/browse/IMPALA-1370
> Project: IMPALA
> Issue Type: Bug
> Affects Versions: Impala 2.0
> Reporter: Uri Laserson
> Assignee: Henry Robinson
> Priority: Minor
>
> If you execute {{SELECT null}} using HS2 protocol V6, then calling
> {{TGetResultSetMetadataReq}} describes the resulting column as boolean, but
> the {{TColumn}} object I get back puts the data in {{stringVal}}:
> {code}
> [TColumn(i32Val=None, byteVal=None, i16Val=None, i64Val=None,
> stringVal=TStringColumn(nulls='\x01', values=['']), boolVal=None,
> doubleVal=None, binaryVal=None)]
> {code}
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