In my reviews of Amit's parallel sequential scan patches yesterday, I complained that he was using planstate_tree_walker incorrectly, but I failed to notice that this was because he'd defined planstate_tree_walker incorrectly. This morning I figured that out. :-)
Here is a patch that *just* introduces planstate_tree_walker and which is hopefully correct. I stole the logic from ExplainPreScanNode, which I also refactored to use the new walker instead of duplicating the logic. I'd like to go ahead and commit this if nobody sees a problem with it. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
planstate-tree-walker.ptch
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