Answer
The execution engine runs the query plan, performing scans, joins, filtering, and computations.
Quick Answer
The Query Execution Engine takes the planner's chosen plan and actually executes it. It uses operator nodes (SeqScan, IndexScan, HashJoin, NestLoop, Sort, Aggregate) arranged as a tree - data flows from leaf nodes up through operators to produce the final result. Rows flow in batches through the pipeline. EXPLAIN ANALYZE shows each node's estimated vs actual rows and execution time.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ