* [Fix](Variant) support materialize view for variant and accessing variant subcolumns
1. fix schema change with path lost and lead to invalid data read
2. support element_at function in BE side and use simdjson to parse data
3. fix multi slot expression
1. limit the column count to default 2048
2. fix get_inverted_index return nullptr when variant's unique id is -1, using it's parent unique id instead
3. avoid add same path subcolumn duplicately in tablet schema
4. make extracted column unique id -1
Prior to PR #27676, data was written with empty path information. Consequently, after implementing #27676, data that already exists in a segment is not included in `column_id_to_footer_ordinal`. This issue will lead to `invalid nonexistent column without default value` error.
By utilizing the zonemap index of the segment, we can ascertain if a predicate is always true. For example, if the segment’s maximum value is 100 and the predicate is col < 101, then this predicate is always true for this segment.
Refactor the interface of create_file_reader
the file_size and mtime are merged into FileDescription, not in FileReaderOptions anymore.
Now the file handle cache can get correct file's modification time from FileDescription.
Add HdfsIO for hdfs file reader
pick from [Enhancement](multi-catalog) Add hdfs read statistics profile. #21442
This PR proposes several changes to improve code safety and readability by replacing raw pointers with smart pointers in several places.
use enable_factory_creator in InvertedIndexIterator and InvertedIndexReader, remove explicit new constructor.
make InvertedIndexReader shared_from_this, it may desctruct when InvertedIndexIterator use it.
* [Improve](performance) introduce SchemaCache to cache TabletSchame & Schema
1. When the system is under high-concurrency load with wide table point queries, the frequent memory allocation and deallocation of Schema become evident system bottlenecks. Additionally, the initialization of TabletSchema and Schema also becomes a CPU hotspot.Therefore, the introduction of a SchemaCache is implemented to cache these resources for reuse.
2. Make some variables wrapped with std::unique<unique_ptr>
Performance:
| 状态 | QPS | 平均响应时间 (avg) | P99 响应时间 |
|------------------|-----|------------------|-------------|
| 开启 SchemaCache | 501 | 20ms | 34ms |
| 关闭 SchemaCache | 321 | 31ms | 61ms |
* handle schema change with schema version
* remove useless header
* rebase
* [fix](segment_iter) do not init segment_iterator twice
SegmentIterator::init is called by Segment::new_iterator and
BetaRowsetReader::get_segment_iterators twice.
Currently, there are some useless includes in the codebase. We can use a tool named include-what-you-use to optimize these includes. By using a strict include-what-you-use policy, we can get lots of benefits from it.
BE will core dump while use whole/sub file cache.
Call func CachedRemoteFileReader/WholeFileCache/SubFileCache::read_at_impl() did not pass IOContext when reading segment footer.
See #17764 for details
I have tested:
- Unit test for local/s3/hdfs/broker file system: be/test/io/fs/file_system_test.cpp
- Outfile to local/s3/hdfs/broker.
- Load from local/s3/hdfs/broker.
- Query file on local/s3/hdfs/broker file system, with table value function and catalog.
- Backup/Restore with local/s3/hdfs/broker file system
Not test:
- cold & host data separation case.
MoW updates the delete bitmap of the imported data during the compaction by rowid conversion. The correctness of rowid conversion is very important to the result of delete bitmap. So I add a rowid conversion result check.
