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.
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