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Co-authored-by: Yongting You <[email protected]>
Co-authored-by: Yongting You <[email protected]>
Co-authored-by: Andrew Lamb <[email protected]>
Co-authored-by: Phillip LeBlanc <[email protected]>
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Starting to check this out |
Contributor
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Thanks. Odd that RustRover rendered it differently but the wording is definitely better :) |
Contributor
Yeah, the pelicanasf rendered is pretty wonky and non standard (also doesn't like markdown tables for some reason 🤷 ) |
Co-authored-by: Kevin Liu <[email protected]>
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| Thanks to [zhuqi-lucas](https://github.com/zhuqi-lucas) for PR [#15104](https://github.com/apache/datafusion/pull/15104) | ||
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| ### Tracing context propagation in spawned tasks |
Contributor
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Thanks for mentioning this change! You can also maybe link to the related datafusion-contrib repo https://github.com/datafusion-contrib/datafusion-tracing which builds upon this, otherwise the description might be a bit too abstract :)
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It makes the post much stronger
alamb
reviewed
Jul 11, 2025
| 2 row(s) fetched. | ||
| ``` | ||
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| Thanks to [irenjj](https://github.com/irenjj) for the initial work in PR [#14677](https://github.com/apache/datafusion/pull/14677) |
alamb
reviewed
Jul 11, 2025
| DataFusion 47.0.0 comes with numerous performance enhancements across the board. Here are some of the noteworthy | ||
| optimizations in this release: | ||
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| - **`FIRST_VALUE` and `LAST_VALUE`:** `FIRST_VALUE` and `LAST_VALUE` functions execute much faster for data with high cardinality such as those with many groups or partitions. DataFusion 47.0.0 executes the following in **7 seconds** compared to **36 seconds** in DataFusion 46.0.0: `select id2, id4, first_value(v1 order by id2, id4) as r2 from '~/h2o_100m.parquet' group by id2, id4` (h2o.ai dataset). (PR's [#15266](https://github.com/apache/datafusion/pull/15266) |
alamb
reviewed
Jul 11, 2025
| - **`FIRST_VALUE` and `LAST_VALUE`:** `FIRST_VALUE` and `LAST_VALUE` functions execute much faster for data with high cardinality such as those with many groups or partitions. DataFusion 47.0.0 executes the following in **7 seconds** compared to **36 seconds** in DataFusion 46.0.0: `select id2, id4, first_value(v1 order by id2, id4) as r2 from '~/h2o_100m.parquet' group by id2, id4` (h2o.ai dataset). (PR's [#15266](https://github.com/apache/datafusion/pull/15266) | ||
| and [#15542](https://github.com/apache/datafusion/pull/15542) by [UBarney](https://github.com/UBarney)). | ||
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| - **`MIN`, `MAX` and `AVG` for Durations:** DataFusion executes aggregate queries up to 2.5x faster when they include `MIN`, `MAX` and `AVG` on `Duration` columns. |
alamb
approved these changes
Jul 11, 2025
| - **Short circuit evaluation for `AND` and `OR`:** DataFusion now eagerly skips the evaluation of | ||
| the right operand if the left is known to be false (`AND`) or true (`OR`) in certain cases. For complex predicates, such as those with many `LIKE` or `CASE` expressions, this optimization results in | ||
| [significant performance improvements](https://github.com/apache/datafusion/issues/11212#issuecomment-2753584617) (up to 100x in extreme cases). | ||
| (PRs [#15462](https://github.com/apache/datafusion/pull/15462) and [#15694](https://github.com/apache/datafusion/pull/15694) |
| optimization (TopK) for fully sorted data. DataFusion 47.0.0 extends the optimization for partially sorted data, which is common in many real-world datasets, such as time-series data sorted by day but not within each day. | ||
| (PR [#15563](https://github.com/apache/datafusion/pull/15563) by [geoffreyclaude](https://github.com/geoffreyclaude)). | ||
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| - **Disable re-validation of spilled files:** DataFusion no longer does unnecessary re-validation of temporary spill files. The validation is unnecessary and expensive as the data is known to be valid when it was written out |
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| Previous versions of DataFusion used `Utf8View` when reading parquet files and it is faster in most cases. | ||
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| Thanks to [zhuqi-lucas](https://github.com/zhuqi-lucas) for PR [#15104](https://github.com/apache/datafusion/pull/15104) |
Contributor
This was referenced Jul 12, 2025
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First cut at a DF 47 blog post as
47.0.0(April 2025) datafusion#15072Please let me know of anything you wish to add/modify