An interactive concept flow for reading a query plan as an execution hypothesis, from its assumptions through the main operation and boundary checks.
trace / request.md
readyA query planner estimates alternative ways to produce a result and chooses one using statistics and cost assumptions. A plan is an executable tree of operators such as scans, joins, sorts, and aggregates. Reading it helps explain where rows are found and how intermediate results are combined.
Use the stages in order to explain reading a query plan as an execution hypothesis. Each stage makes one assumption visible: what the operation promises, what representation it uses, how state changes, which boundary can invalidate a shortcut, and what evidence confirms the result.
For a worked explanation, continue to the topic article and execution trace.
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