bkietz commented on a change in pull request #7526:
URL: https://github.com/apache/arrow/pull/7526#discussion_r444914459
##########
File path: cpp/src/arrow/dataset/file_parquet.cc
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@@ -357,13 +355,20 @@ static inline Result<std::vector<RowGroupInfo>>
AugmentRowGroups(
return row_groups;
}
-Result<ScanTaskIterator> ParquetFileFormat::ScanFile(
- const FileSource& source, std::shared_ptr<ScanOptions> options,
- std::shared_ptr<ScanContext> context, std::vector<RowGroupInfo>
row_groups) const {
+Result<ScanTaskIterator>
ParquetFileFormat::ScanFile(std::shared_ptr<ScanOptions> options,
+
std::shared_ptr<ScanContext> context,
+ FileFragment* fragment)
const {
+ const auto& source = fragment->source();
+ auto row_groups = checked_cast<const
ParquetFileFragment*>(fragment)->row_groups();
+
bool row_groups_are_complete = RowGroupInfosAreComplete(row_groups);
// The following block is required to avoid any IO if all RowGroups are
// excluded due to prior statistics knowledge.
if (row_groups_are_complete) {
+ // physical_schema should be cached at this point
+ ARROW_ASSIGN_OR_RAISE(auto physical_schema,
fragment->ReadPhysicalSchema());
+ RETURN_NOT_OK(options->filter->Validate(*physical_schema));
Review comment:
Fragments created by ParquetDatasetFactory will have their physical
schema populated on construction:
https://github.com/apache/arrow/pull/7526/files#diff-b7aed3b5c0adacff778c6930cc6a03e4R646-R650
After that calling `ReadPhysicalSchema` on those fragments will be an
IO-free operation
https://github.com/apache/arrow/pull/7526/files#diff-ce896c4eb96f3a050aec23151adf58e8R42-R48
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