2010YOUY01 commented on code in PR #135:
URL: https://github.com/apache/datafusion-site/pull/135#discussion_r2724878963
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content/blog/2026-01-08-datafusion-52.0.0.md:
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+---
+layout: post
+title: Apache DataFusion 52.0.0 Released
+date: 2026-01-08
+author: pmc
+categories: [release]
+---
+
+<!--
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+(the "License"); you may not use this file except in compliance with
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+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
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+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+{% endcomment %}
+-->
+
+[TOC]
+
+We are proud to announce the release of [DataFusion 52.0.0]. This post
highlights
+some of the major improvements since [DataFusion 51.0.0]. The complete list of
+changes is available in the [changelog]. Thanks to the [121 contributors] for
+making this release possible.
+
+
+[DataFusion 52.0.0]: https://crates.io/crates/datafusion/52.0.0
+[DataFusion 51.0.0]:
https://datafusion.apache.org/blog/2025/11/25/datafusion-51.0.0/
+[changelog]:
https://github.com/apache/datafusion/blob/branch-52/dev/changelog/52.0.0.md
+[121 contributors]:
https://github.com/apache/datafusion/blob/branch-52/dev/changelog/52.0.0.md#credits
+
+## Performance Improvements 🚀
+
+We continue to make significant performance improvements in DataFusion as
explained below.
+
+### Faster `CASE` Expressions
+
+DataFusion 52 has lookup-table-based evaluation for certain `CASE` expressions
+to avoid repeated evaluation for accelerating common ETL patterns such as
+
+```sql
+CASE company
+ WHEN 1 THEN 'Apple'
+ WHEN 5 THEN 'Samsung'
+ WHEN 2 THEN 'Motorola'
+ WHEN 3 THEN 'LG'
+ ELSE 'Other'
+END
+```
+
+This is the final work in our `CASE` performance epic ([#18075]), which has
+improved `CASE` evaluation significantly. Related PRs [#18183]. Thanks to
+[rluvaton] and [pepijnve] for the implementation.
+
+[rluvaton]: https://github.com/rluvaton
+[pepijnve]: https://github.com/pepijnve
+
+
+[#18075]: https://github.com/apache/datafusion/issues/18075
+[#18183]: https://github.com/apache/datafusion/pull/18183
+
+### `MIN`/`MAX` Aggregate Dynamic Filters
+
+DataFusion now creates dynamic filters for queries with `MIN`/`MAX` aggregates
+that have filters, but no `GROUP BY`. These dynamic filters are used during
scan
+to prune files and rows as tighter bounds are discovered during execution, as
+explained in the [Dynamic Filtering blog]. For example, the following query:
+
+```sql
+SELECT min(l_shipdate)
+FROM lineitem
+WHERE l_returnflag = 'R';
+```
+
+Is now executed like this
+```sql
+SELECT min(l_shipdate)
+FROM lineitem
+-- '__current_min' is updated dynamically during execution
+WHERE l_returnflag = 'R' AND l_shipdate > __current_min;
Review Comment:
```suggestion
WHERE l_returnflag = 'R' AND l_shipdate < __current_min;
```
Thank you, this section describes the optimization precisely. Just one minor
fix.
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