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docs: add Understanding Comet Plans user guide page#4086

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andygrove wants to merge 3 commits intoapache:mainfrom
andygrove:docs/understanding-comet-plans
Open

docs: add Understanding Comet Plans user guide page#4086
andygrove wants to merge 3 commits intoapache:mainfrom
andygrove:docs/understanding-comet-plans

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@andygrove andygrove commented Apr 25, 2026

Which issue does this PR close?

Closes #2413.

Rationale for this change

We need to explain to users how to understand Comet plans, covering areas such as:

  • Difference between CometExchance and CometColumnarExchange.
  • Why some plans have a mix of Spark and Comet operators
  • How fallbacks work
  • The difference between the 4 different explain configs and when to use each one

What changes are included in this PR?

New user guide page.

How are these changes tested?

N/A

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Improve documentation for configs related to explain/fallback

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