doc: More comments to aggregate planning overview#23525
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comphead
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Jul 14, 2026
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Thanks @2010YOUY01 looks good to me
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Which issue does this PR close?
Part of #22710
Rationale for this change
There are currently around 10 specialized aggregation implementations (streams such as AggregateStream). We have comments describing each variant, but no high-level overview. This PR adds one.
It's mostly a aggregate planning overview, and brief intuitions about existing aggregate streams, plus pointers.
What changes are included in this PR?
Are these changes tested?
Are there any user-facing changes?