Copilot commented on code in PR #12583:
URL: https://github.com/apache/gluten/pull/12583#discussion_r3619327262
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cpp-ch/local-engine/Storages/SubstraitSource/ReadBufferBuilder.cpp:
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@@ -326,8 +326,9 @@ class HDFSFileReadBufferBuilder : public ReadBufferBuilder
{
if (!file_size.has_value())
{
- // only for spark3.2 file partition not contained file size
- // so first compute file size first
+ // Fallback for callers whose Substrait LocalFilesNode was
built without a
+ // fileSize list (e.g. some Iceberg producers). Compute the
size by opening
+ // the HDFS file first.
Review Comment:
The updated comment says "fileSize list", but the producing side uses a
`fileSizes` list (plural) to decide whether to set `fileProperties.fileSize`
(see `LocalFilesNode.java`). To avoid reintroducing a misleading term, consider
wording this in terms of missing file size information / missing `fileSizes`
input rather than a "fileSize list".
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