Ensure that the Sources field of the ShowTagValuesStatement is
filled in. Then use the sources to limit the retention policies,
and thus the shards from which tag values are collected.
This fix only works on TSI databases; INMEM shards share
indices, so restricting shard indices used does not restrict the
tag values returned.
This will not permit multiple retention policies to be specified in
a query; either all RPs or one are permitted.
Closes https://github.com/influxdata/influxdb/issues/21981
* fix: Change from RewriteExpr to PartitionExpr
Also remove some dead code
* feat: WITH KEY implementation
* feat: query rewriting for WITH KEY in SHOW TAG KEYS
This commit adds time support to SHOW TAG VALUES. Time can be used as
both a lower and upper boundary. However, there are some caveats.
For the `inmem` index, filtering by time will still return all results
because the index data is shared across shards.
For the `tsi1` index, filtering by time will only work down to the shard
lever. Specifically, when querying by time all shards within that time
range will be used to generate the results.
When a meta query does not include a time component then it can be
answered exclusively by the index. This should result in a much faster
query execution that if the TSM engine was engaged.
This commit rewrites the following queries such that they make use
of the index where no time component is present:
- SHOW MEASUREMENTS
- SHOW SERIES
- SHOW TAG KEYS
- SHOW FIELD KEYS
davidby-influx
Sam Arnold
Adam Perlin
Ben Johnson
Edd Robinson
Stuart Carnie