feat: support pre-binned timeUnit #8971
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Extracting since we'll later use this for other calculation too
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yhoonkim
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Jun 29, 2023
site/docs/transform/timeunit.md
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| By default, all time units represent date time using local time. To use UTC time, you can add the `utc` prefix (e.g., `"utcyear"`, `"utcyearmonth"`). | ||
| - By default, all time units represent date time using local time. | ||
| - To use UTC time, you can add the `utc` prefix (e.g., `"utcyear"`, `"utcyearmonth"`). | ||
| - For timeUnit in encoding, you can also add `"binned"` prefix (e.g., `"binnedyearmonth"` or `"binnedutcyearmonth"`) for Chronological time unit (i.e., units that are truncated date time) |
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Not sure what Chronological time unit means here. Can we just say truncated (or binned) date time directly?
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It's another semantic-based way to explain date trunc (which focus on action being done on the date object, rather than the semantics).
It's a term that Jeff uses in Vega doc. https://vega.github.io/vega/docs/transforms/timeunit/
I added a bit more explanation so I hope it makes more sense now.
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Co-authored-by: GitHub Actions Bot <vega-actions-bot@users.noreply.github.com>
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Fix #8969
This allows us to use timeUnit without adding unnecessary timeUnit to re-bin the data, if the data has already been binned.