3 Commits

Author	SHA1	Message	Date
Matvey Arye	8250714a29	Add fixes for Windows ... - Fix declaration of functions wrt TSDLLEXPORT consistency - Empty structs need to be created with '{ 0 }' syntax. - Alignment sentinels have to use uint64 instead of a struct with a 0-size member - Add some more ORDER BY clauses in the tests to constrain the order of results - Add ANALYZE after running compression in transparent-decompression test	2019-10-29 19:02:58 -04:00
Joshua Lockerman	2f16d84c39	Add ability to compress tables ... We eventually want to be able to compress chunks in the background as they become old enough. As an incremental step in this directions, this commit adds the ability to compress any table, albeit with an unintuitive and brittle interface. This will eventually married to our catalogs and background workers to provide a seamless experience. This commit also fixes a bug in gorilla in which the compressor could not handle the case where the leading/trailing zeroes were always 0.	2019-10-29 19:02:58 -04:00
Joshua Lockerman	584f5d1061	Implement time-series compression algorithms ... This commit introduces 4 compression algorithms as well as 3 ADTs to support them. The compression algorithms are time-series optimized. The following algorithms are implemented: - DeltaDelta compresses integer and timestamp values - Gorilla compresses floats - Dictionary compression handles any data type and is optimized for low-cardinality datasets. - Array stores any data type in an array-like structure and does not actually compress it (though TOAST-based compression can be applied on top). These compression algorithms are are fully described in tsl/src/compression/README.md. The Abstract Data Types that are implemented are - Vector - A dynamic vector that can store any type. - BitArray - A dynamic vector to store bits. - SimpleHash - A hash table implementation from PG12. More information can be found in src/adts/README.md	2019-10-29 19:02:58 -04:00