Support dynamic filters via remote scanner

[jackkleeman]

Dynamic filters massively reduce the number of rows returned in topk operations like 'get the 50 most recent invocations'. They are not particularly helpful locally however, as we have to add a row to a record batch to be able to apply a filter, and at this point we have done 99% of the work of the scan. But remotely, they allow us to send less rows over the wire, which is valuable.

In handle_child_pushdown_result we track any dynamic filters and combine them with our initial filter. Then we are able to snapshot the dynamic filters and send them over the wire when they change, so on the remote side a stricter filter can be applied

[github-actions]

Test Results

  7 files  ±0    7 suites  ±0   3m 16s ⏱️ +5s
 47 tests ±0   47 ✅ ±0  0 💤 ±0  0 ❌ ±0 
200 runs  ±0  200 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 923f158. ± Comparison against base commit 6d25cde.

♻️ This comment has been updated with latest results.