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https://issues.apache.org/jira/browse/HIVE-4797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15373839#comment-15373839
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Derrick Austin commented on HIVE-4797:
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It appears to be bad documentation. With LAG/LEAD, use parameters in the
function instead.
For example, the following appears to work correctly:
LAG(my_field, 1, 0) OVER (ORDER BY b) AS lag_1_month_ago,
LAG(my_field, 12, 0) OVER (ORDER BY b) AS lag_12_months_ago
> Hive Lead/Lag OLAP Not Functioning
> ----------------------------------
>
> Key: HIVE-4797
> URL: https://issues.apache.org/jira/browse/HIVE-4797
> Project: Hive
> Issue Type: Bug
> Components: OLAP
> Affects Versions: 0.11.0
> Environment: Linux version 2.6.18-308.24.1.el5
> (mockbu...@x86-022.build.eng.bos.redhat.com) (gcc version 4.1.2 20080704 (Red
> Hat 4.1.2-52))
> Java 1.6.0_31
> Hadoop 1.2.0
> Hive 0.11.0
> Reporter: Joshua Lee
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Unable to use built in LAG/LEAD functionality. Following the example in
> documentation at
> https://cwiki.apache.org/confluence/display/Hive/LanguageManual+WindowingAndAnalytics
> leads to error. This leads me to believe that this is a bug rather than
> something wrong with my query. Specifically:
> -- Set up database
> hive> create table lag_test(a int, b int, c string, d string) row format
> delimited fields terminated by "\t";
> -- load test data using local file
> -- Run test query
> hive> SELECT a, LEAD(a) OVER (PARTITION BY b ORDER BY C ROWS BETWEEN CURRENT
> ROW AND 1 FOLLOWING) FROM lag_test; -- copied from documentation
> FAILED: SemanticException Failed to breakup Windowing invocations into
> Groups. At least 1 group must only depend on input columns. Also check for
> circular dependencies.
> Underlying error: Expecting left window frame boundary for function
> LEAD((TOK_TABLE_OR_COL a))
> org.apache.hadoop.hive.ql.parse.WindowingSpec$WindowSpec@39fe9830 as _wcol0
> to be unbounded. Found : 0
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