alamb commented on code in PR #99:
URL: https://github.com/apache/datafusion-site/pull/99#discussion_r2269720012
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content/blog/2025-08-15-external-parquet-indexes.md:
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@@ -0,0 +1,772 @@
+---
+layout: post
+title: Using External Indexes, Metadata Stores, Catalogs and Caches to
Accelerate Queries on Apache Parquet
+date: 2025-08-15
+author: Andrew Lamb (InfluxData)
+categories: [features]
+---
+<!--
+{% comment %}
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements. See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to you under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+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 %}
+-->
+
+
+It is a common misconception that [Apache Parquet] requires (slow) reparsing of
+metadata and is limited to indexing structures provided by the format. In fact,
+caching parsed metadata and using custom external indexes along with
+Parquet's hierarchical data organization can significantly speed up query
+processing.
+
+In this blog, I describe the role of external indexes, caches, and metadata
+stores in high performance systems, and demonstrate how to apply these concepts
+to Parquet processing using [Apache DataFusion]. *Note this is an expanded
+version of the [companion video] and [presentation].*
+
+# Motivation
Review Comment:
Fixed in 3bf2165
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