Clarify what some historic terms in rewriteHandler.c mean.
Discussion: 20150827131352.GF2435@awork2.anarazel.de
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* IDENTIFICATION
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* src/backend/rewrite/rewriteHandler.c
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*
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* NOTES
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* Some of the terms used in this file are of historic nature: "retrieve"
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* was the PostQUEL keyword for what today is SELECT. "RIR" stands for
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* "Retrieve-Instead-Retrieve", that is an ON SELECT DO INSTEAD SELECT rule
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* (which has to be unconditional and where only one rule can exist on each
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* relation).
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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