Bennie Can created HIVE-11154:
---------------------------------
Summary: Indexing not activated with left outer join and where
clause
Key: HIVE-11154
URL: https://issues.apache.org/jira/browse/HIVE-11154
Project: Hive
Issue Type: Bug
Components: Hive, Indexing, Tez
Affects Versions: 0.13.1, tez-branch
Environment: HDInsight
Reporter: Bennie Can
Assignee: Bennie Can
I am attempting to optimize a query using indexing. However, indexing is not
being activated, and my query takes an impractical amount of time to complete.
Note that John Pullokkaran at Hortonworks has had a look at the "explain
extended" log and suggested that I file a bug report.
Here is how I set up indexing:
Set hive.optimize.index.filter=true;
DROP INDEX IF EXISTS ipv4indexes ON ipv4geotable;
CREATE INDEX ipv4indexes
ON TABLE ipv4geotable (StartIp, EndIp)
AS 'org.apache.hadoop.hive.ql.index.compact.CompactIndexHandler'
WITH DEFERRED REBUILD
IDXPROPERTIES ('hive.index.compact.binary.search'='true');
ALTER INDEX ipv4indexes ON ipv4geotable REBUILD;
And here is my query:
DROP TABLE IF EXISTS ipv4table;
CREATE TABLE ipv4table AS
SELECT logon.IP, ipv4.Country
FROM
(SELECT * FROM logontable WHERE isIpv4(IP)) logon
LEFT OUTER JOIN
(SELECT StartIp, EndIp, Country FROM ipv4geotable) ipv4 ON isIpv4(logon.IP)
WHERE ipv4.StartIp <= logon.IP AND logon.IP <= ipv4.EndIp;
What the query is doing is extracting an IP from logontable and finding in
which range it lies within a geolocation table (which is sorted). When a range
is found, a country matching the IP range is returned.
I need to set up indexing in order to conduct a binary search rather than going
through millions of rows one at a time. Note that I use the Tez engine, but the
problem also occurs with map-reduce.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
