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table access methods: sequential scans, index scans, and bitmap index
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scans. If the query requires joining, aggregation, sorting, or other
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operations on the raw rows, then there will be additional nodes
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of <command>EXPLAIN</command> has one line for each node in the plan
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tree, showing the basic node type plus the cost estimates that the planner
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made for the execution of that plan node. The first line (topmost node)