AI & Machine Learning

1.2.3 Query tree node types: Query, RangeTblEntry, TargetEntry

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The article details how PostgreSQL transforms raw parse trees into Query trees during query analysis, resolving tokens to catalog coordinates and abstracting SQL elements for efficient processing by subsequent stages like rewriter and planner. This transformation simplifies handling diverse SQL operations through a unified data structure, ensuring consistent execution planning and enabling tools like EXPLAIN to work uniformly across different types of statements.

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1.2.3 Query tree node types: Query, RangeTblEntry, TargetEntry

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