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https://issues.apache.org/jira/browse/TAJO-919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14278388#comment-14278388
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ASF GitHub Bot commented on TAJO-919:
-------------------------------------
Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/351#issuecomment-70050281
According to https://wiki.postgresql.org/wiki/SQL2008_windowing_queries,
the offset is a positive integer (offset > 0). So, your assumption would be
right. If offset or default value is omitted, default offset will be 1 and
default value will be null.
> Implement LAG and LEAD window functions
> ---------------------------------------
>
> Key: TAJO-919
> URL: https://issues.apache.org/jira/browse/TAJO-919
> Project: Tajo
> Issue Type: Sub-task
> Components: function/udf, physical operator
> Reporter: Hyunsik Choi
> Assignee: Keuntae Park
> Fix For: window function
>
>
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