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[MINOR][CH] Correct misleading Spark 3.2 comment in ReadBufferBuilder #12583

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[MINOR][CH] Correct misleading Spark 3.2 comment in ReadBufferBuilder #12583

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887b62f
[MINOR][CH] Correct misleading Spark 3.2 comment in ReadBufferBuilder
LuciferYang Jul 21, 2026
8cccb46
[MINOR] Reword ReadBufferBuilder fallback comment for accuracy
LuciferYang Jul 21, 2026
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5 changes: 3 additions & 2 deletions cpp-ch/local-engine/Storages/SubstraitSource/ReadBufferBuilder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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
// `fileSizes` input (e.g. some Iceberg producers), so no per-file `fileSize`
// property is available. Compute the size by opening the HDFS file first.
auto tmp_read_buffer = std::make_unique<DB::ReadBufferFromHDFS>(
hdfs_uri,
hdfs_file_path,
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