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3696a600e2
This adds the SQL standard feature that adds the SEARCH and CYCLE clauses to recursive queries to be able to do produce breadth- or depth-first search orders and detect cycles. These clauses can be rewritten into queries using existing syntax, and that is what this patch does in the rewriter. Reviewed-by: Vik Fearing <vik@postgresfriends.org> Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/db80ceee-6f97-9b4a-8ee8-3ba0c58e5be2@2ndquadrant.com
22 lines
636 B
C
22 lines
636 B
C
/*-------------------------------------------------------------------------
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*
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* rewriteSearchCycle.h
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* Support for rewriting SEARCH and CYCLE clauses.
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*
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*
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* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/rewrite/rewriteSearchCycle.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef REWRITESEARCHCYCLE_H
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#define REWRITESEARCHCYCLE_H
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#include "nodes/parsenodes.h"
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extern CommonTableExpr *rewriteSearchAndCycle(CommonTableExpr *cte);
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#endif /* REWRITESEARCHCYCLE_H */
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