gabotechs commented on PR #19761:
URL: https://github.com/apache/datafusion/pull/19761#issuecomment-3935748767
> Would it make sense to detect an empty build side right after
collect_build_side completes, and for join types where empty build --> empty
output , drop the probe stream immediately and jump to Completed?
This sounds good. It would be nice if this mechanism is handled by the
dynamic filter rather than just an `if build_side.rows == 0 { return Completed;
}`, as at the end of the day, this is just an extreme case of dynamic filtering.
That could give the chance to nodes like `BufferExec` to intercept that
there's a dynamic filter below, and that it should hold on a bit the buffering
to see if some work can be skipped.
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