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Clarify what some historic terms in rewriteHandler.c mean.

Discussion: 20150827131352.GF2435@awork2.anarazel.de

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Original file line number	Diff line number	Diff line change
`@@ -9,6 +9,13 @@`
`9`	`9`	`* IDENTIFICATION`
`10`	`10`	`* src/backend/rewrite/rewriteHandler.c`
`11`	`11`	`*`
	`12`	`+ * NOTES`
	`13`	`+ * Some of the terms used in this file are of historic nature: "retrieve"`
	`14`	`+ * was the PostQUEL keyword for what today is SELECT. "RIR" stands for`
	`15`	`+ * "Retrieve-Instead-Retrieve", that is an ON SELECT DO INSTEAD SELECT rule`
	`16`	`+ * (which has to be unconditional and where only one rule can exist on each`
	`17`	`+ * relation).`
	`18`	`+ *`
`12`	`19`	`*-------------------------------------------------------------------------`
`13`	`20`	`*/`
`14`	`21`	`#include"postgres.h"`

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