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Commita0d9f6e

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Add readfuncs.c support for plan nodes.
For parallel query, we need to be able to pass a Plan to a worker, sothat it knows what it's supposed to do. We could invent our own wayof serializing plans for that purpose, but piggybacking on theexisting node infrastructure seems like a much better idea.Initially, we'll probably only support a limited number of nodeswithin parallel workers, but this commit adds support for everythingin plannodes.h except CustomScan, because doing it all at once seemseasier than doing it piecemeal, and it makes testing this code easier,too. CustomScan is excluded because making that work requires alarger rework of that facility.Amit Kapila, reviewed and slightly revised by me.
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‎src/backend/nodes/outfuncs.c

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* NOTES
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* Every node type that can appear in stored rules' parsetrees *must*
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* have an output function defined here (as well as an input function
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* in readfuncs.c). For use in debugging, we also provide output
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* functions for nodes that appear in raw parsetrees, path, and plan trees.
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* These nodes however need not have input functions.
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* in readfuncs.c). In addition, plan nodes should have input and
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* output functions so that they can be sent to parallel workers.
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* For use in debugging, we also provide output functions for nodes
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* that appear in raw parsetrees and path. These nodes however need
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* not have input functions.
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*
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*-------------------------------------------------------------------------
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*/

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