apache / apache/datafusion

Apply filters to `RecordBatch` instead of indices in nested loop join

Open
#16,773 2 comments 0 reactions 0 assignees View on GitHub
enhancement
Dominant language
Rust
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Forks
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Avg merge
3d 7h
Merged PRs (30d)
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Description

### Is your feature request related to a problem or challenge?

> I think batch coalescer won't make this faster as this is buffering everything in memory anyway.
>
> The main idea would be to apply the filters iteratively to the incoming `RecordBatch` instead of the indices, so we have to change the API / implementation a bit more.

@Dandandan mentions in #16443 that we apply filters to the `RecordBatch` when processing incoming batches in nested loop join.

### Describe the solution you'd like

_No response_

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

Contributor guide

Open the contributing guide

Research direction

Start by tracing how nested loop join processes incoming RecordBatch values and where filters are currently applied to indices; review the discussion in #16443. Done means defining the required API and implementation changes so filters are applied iteratively to the incoming RecordBatch instead.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
data-engineering, databases
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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