pitrou commented on code in PR #45330:
URL: https://github.com/apache/arrow/pull/45330#discussion_r1950867561
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cpp/src/arrow/dataset/file_parquet.cc:
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@@ -835,6 +833,10 @@ Status ParquetFileFragment::SetMetadata(
DCHECK_EQ(manifest_->descr, original_metadata_->schema())
<< "SchemaDescriptor should be owned by the original FileMetaData";
+ if (!physical_schema_) {
Review Comment:
If you look at the existing uses of `SetMetadata`, they either already took
the lock or are calling the method on a brand new fragment instance that cannot
possibly be used from another thread yet.
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