# NOT RUN {
win_over(sql("avg(x)"))
win_over(sql("avg(x)"), "y")
win_over(sql("avg(x)"), order = "y")
win_over(sql("avg(x)"), order = c("x", "y"))
win_over(sql("avg(x)"), frame = c(-Inf, 0), order = "y")
# }
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