viirya commented on code in PR #7090:
URL: https://github.com/apache/datafusion-comet/pull/7090#discussion_r4307796865


##########
docs/source/_templates/redirect.html:
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@@ -0,0 +1,20 @@
+<!--
+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.
+-->
+
+<html><head><noscript><meta http-equiv="refresh" content="0; url=${to_uri}" 
/></noscript><script>var target = "${to_uri}";if (window.location.hash) 
{window.location.replace(target.split("#")[0] + window.location.hash);} else 
{window.location.replace(target);}</script></head></html>

Review Comment:
   Non-blocking: with the old hash replacing the target's, a deep link only 
lands on its section when the old anchor still exists on the new page. For the 
three Parquet redirects, most old anchors don't:
   
   - `compatibility/scans.html`: `#schema-mismatch-handling` survives; 
`#parquet-scan-limitations` doesn't.
   - `tuning/scans.html`: `#filter-pushdown--late-materialization` survives; 
`#parquet-reader-tuning`, `#parquet-native-scans` and `#iceberg-scan-tuning` 
don't.
   - `parquet-iceberg-known-issues.html`: only 
`#differences-that-are-not-comet-bugs` survives; `#parquet-reads`, 
`#iceberg-writes`, `#results-that-differ-from-spark` and the rest don't.
   
   For those, the browser ignores the unknown fragment and the reader lands at 
the top of `parquet.html`, not at `#reading`, `#tuning` or `#known-issues`.
   
   Letting the target's anchor win when it has one, and carrying the old hash 
over only when it doesn't, would send every Parquet deep link to its section. 
`iceberg-writes.html` would still carry its anchors through, since its target 
has none and they all still exist:
   
   ```js
   var target = "${to_uri}";
   if (window.location.hash && target.indexOf("#") < 0) { target += 
window.location.hash; }
   window.location.replace(target);
   ```
   
   The cost is that the two surviving Parquet anchors land on their parent 
section instead. The known-issues page was only up for a day, so this mostly 
matters for the older `scans.html` links. Fine either way.



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