[Feature](orc-reader) Implement new merge io facility for orc reader. #52085
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Thank you for your contribution to Apache Doris. Please clearly describe your PR:
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kaka11chen
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…apache#45966) related: apache/doris-thirdparty#270 Problem Summary: The original merge io mechanism `MergeRangeFileReader` requires that the range must be read in order, and the ranges can be out of order, so the range cannot be read back. And if you turn on delayed materialization of orc complex types, you will need to present a stream readback scenario, such as `select struct_element(info, 'age'), id from test_orc_struct, where struct_element(info, 'name') = 'Alice'`. When late materialization is turned on, the present stream of the parent node `info` will be read first after `name` is read. When reading `age`, the parent node `info` needs to be read back. So the late materialization of the orc complex type cannot be turned on at present.
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… of orc-reader. (apache#51102) ### What problem does this PR solve? Related PR: apache#45966 Fix merge range not sorted in new merge io facility of orc-reader. Because the ranges taken from std::unordered_map<orc::StreamId, io::PrefetchRange>&ranges are not sorted, merging adjacent ranges will have a very poor effect.
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…filtered by row group stats, despite stripe stats remaining unfiltered. (apache#50185) Related PR: apache/doris-thirdparty#306 Problem Summary: When all row groups are filtered by row group stats, despite stripe stats remaining unfiltered, stream map is not clear, which caused read error data. ``` ERROR 1105 (HY000): errCode = 2, detailMessage = (172.20.32.136)[INTERNAL_ERROR]Orc row reader nextBatch failed. reason = Buffer error in ZlibDecompressionStream::NextDecompress. ```
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BE UT Coverage ReportIncrement line coverage Increment coverage report
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morrySnow
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Jun 25, 2025
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Cherry-pick main PR: #45966, Fix bugs PR: #50185 #51102