database/mariadb-columnstore-engine
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MCOL-987 Add LZ4 compression.

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* Adds CompressInterfaceLZ4 which uses LZ4 API for compress/uncompress.
* Adds CMake machinery to search LZ4 on running host.
* All methods which use static data and do not modify any internal data - become `static`,
  so we can use them without creation of the specific object. This is possible, because
  the header specification has not been modified. We still use 2 sections in header, first
  one with file meta data, the second one with pointers for compressed chunks.
* Methods `compress`, `uncompress`, `maxCompressedSize`, `getUncompressedSize` - become
  pure virtual, so we can override them for the other compression algos.
* Adds method `getChunkMagicNumber`, so we can verify chunk magic number
  for each compression algo.
* Renames "s/IDBCompressInterface/CompressInterface/g" according to requirement.
This commit is contained in:
Denis Khalikov
2021-04-01 17:26:38 +03:00
parent dd12bd3cd0
commit cc1c3629c5
45 changed files with 1311 additions and 549 deletions
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6
dbcon/mysql/columnstore_info.sql
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@ -95,7 +95,11 @@ DROP PROCEDURE IF EXISTS `compression_ratio` //
CREATE PROCEDURE compression_ratio() SQL SECURITY INVOKER
BEGIN
SELECT CONCAT((SELECT SUM(data_size) FROM information_schema.columnstore_extents ce left join information_schema.columnstore_columns cc on ce.object_id = cc.object_id where compression_type='Snappy') / (SELECT SUM(compressed_data_size) FROM information_schema.columnstore_files WHERE compressed_data_size IS NOT NULL), ':1') COMPRESSION_RATIO;
SELECT 'Snappy' as compression_method, CONCAT((SELECT SUM(data_size) FROM information_schema.columnstore_extents ce left join information_schema.columnstore_columns cc on ce.object_id = cc.object_id where compression_type='Snappy') / (SELECT SUM(compressed_data_size) FROM information_schema.columnstore_files co left join information_schema.columnstore_columns cc on (co.object_id = cc.object_id) left join information_schema.columnstore_extents ce on (ce.object_id = co.object_id) where compression_type='Snappy' and compressed_data_size IS NOT NULL /* could be a situation when compressed_data_size != NULL but data_size == 0, in this case we will get wrong ratio */ and data_size > 0), ':1') compression_ratio
UNION ALL
SELECT 'LZ4' as compression_method, CONCAT((SELECT SUM(data_size) FROM information_schema.columnstore_extents ce left join information_schema.columnstore_columns cc on ce.object_id = cc.object_id where compression_type='LZ4') / (SELECT SUM(compressed_data_size) FROM information_schema.columnstore_files co left join information_schema.columnstore_columns cc on (co.object_id = cc.object_id) left join information_schema.columnstore_extents ce on (ce.object_id = co.object_id) where compression_type='LZ4' and compressed_data_size IS NOT NULL /* could be a situation when compressed_data_size != NULL but data_size == 0, in this case we will get wrong ratio */ and data_size > 0), ':1') as compression_ratio;
END //
create or replace procedure columnstore_upgrade() SQL SECURITY INVOKER