This commit adds tests for DATE, TIMESTAMP, and FLOAT compression and
decompression, NULL compression and decompression in dictionaries and
fixes a bug where the database would refuse to decompress DATEs. This
commit also removes the fallback allowing any binary compatible 8-byte
types to be compressed by our integer compressors as I believe I found
a bug in said fallback last time I reviewed it, and cannot recall what
the bug was. These can be re-added later, with appropriate tests.
This commit adds tests for:
1. Fixed-size pass-by-ref types.
2. Types whose alignment is greater than their size.
3. NULLs in segmentby columns
All of which were reported as missing by Codecov
The statistics on segmentby and metadata columns are very important as
they affect the decompressed data a thousand-fold. Statistics on the
compressed columns are irrelevant, as the regular postgres planner
cannot understand the compressed columns. This commit sets the
statistics for compressed tables based on this, weighting the
uncompressed columns greatly, and the compressed columns not-at-all.
This simplifies the code and the access to the min/max
metadata. Before we used a custom type, but now the min/max
are just the same type as the underlying column and stored as two
columns.
This also removes the custom type that was used before.
This commit integrates the SegmentMetaMinMax into the
compression logic. It adds metadata columns to the compressed table
and correctly sets it upon compression.
We also fix several errors with datum detoasting in SegmentMetaMinMax
Adds several test features:
- Add a tests on compression of an altered hypertable
- Adds tests for transparent decompression in hypertables tests
- Add dump/restore in hypertable test
This rebuilds indexes during compression and decompression. Previously,
indexes were not updated during these operations. We also fix
a small bug with orderby and segmentby handling of empty strings/
lists.
Finally, we add some more tests.
