jgoday opened a new pull request #687:
URL: https://github.com/apache/arrow-datafusion/pull/687
# Which issue does this PR close?
#Closes 554.
# Rationale for this change
Implement offset and default value optional arguments in lead/lag window
functions.
# What changes are included in this PR?
Changes in lead/lag pub fn signatures.
# Are there any user-facing changes?
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