joinp: note asof joins usefulness for time series data wrangling

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jqnatividad · Sep 6, 2023 · 261cfd4 · 261cfd4
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commit 261cfd4
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diff --git a/src/cmd/joinp.rs b/src/cmd/joinp.rs
@@ -96,6 +96,7 @@ joinp options:
  join, except we match on nearest key rather than
  equal keys. Note that both CSV data sets will be SORTED
  AUTOMATICALLY on the join columns.
+ Particularly useful for time series data.
  --left_by <arg> Do an 'asof_by' join - a special implementation of the asof
  join that searches for the nearest keys within a subgroup
  set by the asof_by columns. This specifies the column/s for