Previously we could have a dangling policy and job referring
to a now-dropped hypertable.
We also block changing the compression options if a policy exists.
Fixes#1570
Previously, refresh_lag in continuous aggs was calculated
relative to the maximum timestamp in the table. Change the
semantics so that it is relative to now(). This is more
intuitive.
Requires an integer_now function applied to hypertables
with integer-based time dimensions.
Since enabling compression creates limits on the hypertable
(e.g. types of constraints allowed) even if there are no
compressed chunks, we add the ability to turn off compression.
This is only possible if there are no compressed chunks.
For tablepaces with compressed chunks the semantics are the following:
- compressed chunks get put into the same tablespace as the
uncommpressed chunk on compression.
- set tablespace on uncompressed hypertable cascades to compressed hypertable+chunks
- set tablespace on all chunks is blocked (same as w/o compression)
- move chunks on a uncompressed chunk errors
- move chunks on compressed chunk works
In the future we will:
- add tablespace option to compress_chunk function and policy (this will override the setting
of the uncompressed chunk). This will allow changing tablespaces upon compression
- Note: The current plan is to never listen to the setting on compressed hypertable. In fact,
we will block setting tablespace on compressed hypertables
Block most DDL commands on hypertables with compression enabled.
This restriction will be relaxed over time.
The only alter table commands currently allowed are:
Add/Remove index, Set storage options, clustering index,
set statistics and set tablespace.
We also disallow reseting compression options.
- 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
This fixes delete of relate rows when we have compressed
hypertables. Namely we delete rows from:
- compression_chunk_size
- hypertable_compression
We also fix hypertable_compression to handle NULLS correctly.
We add a stub for tests with continuous aggs as well as compression.
But, that's broken for now so it's commented out. Will be fixed
in another PR.
This commit add handling for dropping of chunks and hypertables
in the presence of associated compressed objects. If the uncompressed
chunk/hypertable is dropped than drop the associated compressed object
using DROP_RESTRICT unless cascading is explicitly enabled.
Also add a compressed_chunk_id index on compressed tables for
figuring out whether a chunk is compressed or not.
Change a bunch of APIs to use DropBehavior instead of a cascade bool
to be more explicit.
Also test the drop chunks policy.
