Zhu, Lipeng created SPARK-27952:
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Summary: Built-in function: lag
Key: SPARK-27952
URL: https://issues.apache.org/jira/browse/SPARK-27952
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 3.0.0
Reporter: Zhu, Lipeng
[https://www.postgresql.org/docs/8.4/functions-window.html]
|{{lag({{value}} {{any}} [, {{offset}}{{integer}} [, {{default}} {{any}}
]])}}|{{same type as }}{{value}}|returns {{value}} evaluated at the row that is
{{offset}} rows before the current row within the partition; if there is no
such row, instead return {{default}}. Both {{offset}}and {{default}} are
evaluated with respect to the current row. If omitted, {{offset}} defaults to 1
and {{default}} to null|
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