Avoid loading all symbols for each partition destination

[cyriltovena]

Sounds like partition.init doesn't care and will always load all symbols for the current partition.

It seems like an oversight.

[cyriltovena]

The tests is showing that Load and query path is not friendly. Thinking about how to solve this, basically we shouldn't not use the symbols for the read path if Load is used.

[kolesnikovae]

Nice catch, thanks for fixing this!

The tests is showing that Load and query path is not friendly. Thinking about how to solve this, basically we shouldn't not use the symbols for the read path if Load is used.

Agreed: the only use case for Load is compaction, and it should never be used in our regular queries (however, loaded blocks should be queryable). Moreover, the test itself is not quite useful – it's worth counting object storage client calls to ensure that a partition is only fetched once at Load call. I'll take care of the test when will optimize symbols rewriter (this week hopefully)