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Explain Nodes

From: "David E(dot) Wheeler" <david(at)kineticode(dot)com>
To: "pgsql-hackers(at)postgresql(dot)org Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Explain Nodes
Date: 2011-04-28 21:49:36
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers

For my [explanation extension]( I wanted to put together a list of node types, since I'm always having to figure them out to decide which nodes I'm interested in. Reading src/backend/commands/explain.c I assembled this list:

    + Aggregate
    + Append
    + Bitmap Heap Scan
    + Bitmap Index Scan
    + BitmapAnd
    + BitmapOr
    + CTE Scan
    + Foreign Scan
    + Function Scan
    + Group
    + Hash
    + Hash Join
    + Index Scan
    + Limit
    + LockRows
    + Materialize
    + Merge Append
    + Merge Join
    + ModifyTable
    + Nested Loop
    + Recursive Union
    + Result
    + Seq Scan
    + SetOp
    + Sort
    + Subquery Scan
    + Tid Scan
    + Unique
    + Values Scan
    + WindowAgg
    + WorkTable Scan

Is that accurate? I was looking at how `sname` was set, but maybe it can be set other ways?

Should a list like this be added to the EXPLAIN docs?




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