From 0b03e5951bf0a1a8868db13f02049cf686a82165 Mon Sep 17 00:00:00 2001 From: Robert Haas Date: Fri, 7 Nov 2014 17:26:02 -0500 Subject: Introduce custom path and scan providers. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This allows extension modules to define their own methods for scanning a relation, and get the core code to use them. It's unclear as yet how much use this capability will find, but we won't find out if we never commit it. KaiGai Kohei, reviewed at various times and in various levels of detail by Shigeru Hanada, Tom Lane, Andres Freund, Álvaro Herrera, and myself. --- src/include/executor/executor.h | 3 ++- src/include/executor/nodeCustom.h | 30 ++++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+), 1 deletion(-) create mode 100644 src/include/executor/nodeCustom.h (limited to 'src/include/executor') diff --git a/src/include/executor/executor.h b/src/include/executor/executor.h index d167b496fce..a44b4cde0fa 100644 --- a/src/include/executor/executor.h +++ b/src/include/executor/executor.h @@ -16,6 +16,7 @@ #include "executor/execdesc.h" #include "nodes/parsenodes.h" +#include "nodes/relation.h" #include "utils/lockwaitpolicy.h" @@ -103,7 +104,7 @@ extern PGDLLIMPORT ExecutorCheckPerms_hook_type ExecutorCheckPerms_hook; extern void ExecReScan(PlanState *node); extern void ExecMarkPos(PlanState *node); extern void ExecRestrPos(PlanState *node); -extern bool ExecSupportsMarkRestore(NodeTag plantype); +extern bool ExecSupportsMarkRestore(Path *pathnode); extern bool ExecSupportsBackwardScan(Plan *node); extern bool ExecMaterializesOutput(NodeTag plantype); diff --git a/src/include/executor/nodeCustom.h b/src/include/executor/nodeCustom.h new file mode 100644 index 00000000000..1736d48bfaf --- /dev/null +++ b/src/include/executor/nodeCustom.h @@ -0,0 +1,30 @@ +/* ------------------------------------------------------------------------ + * + * nodeCustom.h + * + * prototypes for CustomScan nodes + * + * Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * ------------------------------------------------------------------------ + */ +#ifndef NODECUSTOM_H +#define NODECUSTOM_H +#include "nodes/plannodes.h" +#include "nodes/execnodes.h" + +/* + * General executor code + */ +extern CustomScanState *ExecInitCustomScan(CustomScan *custom_scan, + EState *estate, int eflags); +extern TupleTableSlot *ExecCustomScan(CustomScanState *node); +extern Node *MultiExecCustomScan(CustomScanState *node); +extern void ExecEndCustomScan(CustomScanState *node); + +extern void ExecReScanCustomScan(CustomScanState *node); +extern void ExecCustomMarkPos(CustomScanState *node); +extern void ExecCustomRestrPos(CustomScanState *node); + +#endif /* NODECUSTOM_H */ -- cgit v1.2.3