1 files changed, 257 insertions, 0 deletions
diff --git a/src/include/access/spgxlog.h b/src/include/access/spgxlog.h
new file mode 100644
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+++ b/src/include/access/spgxlog.h
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+/*-------------------------------------------------------------------------
+ *
+ * spgxlog.h
+ *	  xlog declarations for SP-GiST access method.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/access/spgxlog.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SPGXLOG_H
+#define SPGXLOG_H
+
+#include "access/xlogreader.h"
+#include "lib/stringinfo.h"
+#include "storage/off.h"
+
+/* XLOG record types for SPGiST */
+ /* #define XLOG_SPGIST_CREATE_INDEX       0x00 */	/* not used anymore */
+#define XLOG_SPGIST_ADD_LEAF		0x10
+#define XLOG_SPGIST_MOVE_LEAFS		0x20
+#define XLOG_SPGIST_ADD_NODE		0x30
+#define XLOG_SPGIST_SPLIT_TUPLE		0x40
+#define XLOG_SPGIST_PICKSPLIT		0x50
+#define XLOG_SPGIST_VACUUM_LEAF		0x60
+#define XLOG_SPGIST_VACUUM_ROOT		0x70
+#define XLOG_SPGIST_VACUUM_REDIRECT 0x80
+
+/*
+ * Some redo functions need an SpGistState, although only a few of its fields
+ * need to be valid.  spgxlogState carries the required info in xlog records.
+ * (See fillFakeState in spgxlog.c for more comments.)
+ */
+typedef struct spgxlogState
+{
+	TransactionId myXid;
+	bool		isBuild;
+} spgxlogState;
+
+/*
+ * Backup Blk 0: destination page for leaf tuple
+ * Backup Blk 1: parent page (if any)
+ */
+typedef struct spgxlogAddLeaf
+{
+	bool		newPage;		/* init dest page? */
+	bool		storesNulls;	/* page is in the nulls tree? */
+	OffsetNumber offnumLeaf;	/* offset where leaf tuple gets placed */
+	OffsetNumber offnumHeadLeaf;	/* offset of head tuple in chain, if any */
+
+	OffsetNumber offnumParent;	/* where the parent downlink is, if any */
+	uint16		nodeI;
+
+	/* new leaf tuple follows (unaligned!) */
+} spgxlogAddLeaf;
+
+/*
+ * Backup Blk 0: source leaf page
+ * Backup Blk 1: destination leaf page
+ * Backup Blk 2: parent page
+ */
+typedef struct spgxlogMoveLeafs
+{
+	uint16		nMoves;			/* number of tuples moved from source page */
+	bool		newPage;		/* init dest page? */
+	bool		replaceDead;	/* are we replacing a DEAD source tuple? */
+	bool		storesNulls;	/* pages are in the nulls tree? */
+
+	/* where the parent downlink is */
+	OffsetNumber offnumParent;
+	uint16		nodeI;
+
+	spgxlogState stateSrc;
+
+	/*----------
+	 * data follows:
+	 *		array of deleted tuple numbers, length nMoves
+	 *		array of inserted tuple numbers, length nMoves + 1 or 1
+	 *		list of leaf tuples, length nMoves + 1 or 1 (unaligned!)
+	 *
+	 * Note: if replaceDead is true then there is only one inserted tuple
+	 * number and only one leaf tuple in the data, because we are not copying
+	 * the dead tuple from the source
+	 *----------
+	 */
+	OffsetNumber offsets[FLEXIBLE_ARRAY_MEMBER];
+} spgxlogMoveLeafs;
+
+#define SizeOfSpgxlogMoveLeafs	offsetof(spgxlogMoveLeafs, offsets)
+
+/*
+ * Backup Blk 0: original page
+ * Backup Blk 1: where new tuple goes, if not same place
+ * Backup Blk 2: where parent downlink is, if updated and different from
+ *				 the old and new
+ */
+typedef struct spgxlogAddNode
+{
+	/*
+	 * Offset of the original inner tuple, in the original page (on backup
+	 * block 0).
+	 */
+	OffsetNumber offnum;
+
+	/*
+	 * Offset of the new tuple, on the new page (on backup block 1). Invalid,
+	 * if we overwrote the old tuple in the original page).
+	 */
+	OffsetNumber offnumNew;
+	bool		newPage;		/* init new page? */
+
+	/*----
+	 * Where is the parent downlink? parentBlk indicates which page it's on,
+	 * and offnumParent is the offset within the page. The possible values for
+	 * parentBlk are:
+	 *
+	 * 0: parent == original page
+	 * 1: parent == new page
+	 * 2: parent == different page (blk ref 2)
+	 * -1: parent not updated
+	 *----
+	 */
+	int8		parentBlk;
+	OffsetNumber offnumParent;	/* offset within the parent page */
+
+	uint16		nodeI;
+
+	spgxlogState stateSrc;
+
+	/*
+	 * updated inner tuple follows (unaligned!)
+	 */
+} spgxlogAddNode;
+
+/*
+ * Backup Blk 0: where the prefix tuple goes
+ * Backup Blk 1: where the postfix tuple goes (if different page)
+ */
+typedef struct spgxlogSplitTuple
+{
+	/* where the prefix tuple goes */
+	OffsetNumber offnumPrefix;
+
+	/* where the postfix tuple goes */
+	OffsetNumber offnumPostfix;
+	bool		newPage;		/* need to init that page? */
+	bool		postfixBlkSame; /* was postfix tuple put on same page as
+								 * prefix? */
+
+	/*
+	 * new prefix inner tuple follows, then new postfix inner tuple (both are
+	 * unaligned!)
+	 */
+} spgxlogSplitTuple;
+
+/*
+ * Buffer references in the rdata array are:
+ * Backup Blk 0: Src page (only if not root)
+ * Backup Blk 1: Dest page (if used)
+ * Backup Blk 2: Inner page
+ * Backup Blk 3: Parent page (if any, and different from Inner)
+ */
+typedef struct spgxlogPickSplit
+{
+	bool		isRootSplit;
+
+	uint16		nDelete;		/* n to delete from Src */
+	uint16		nInsert;		/* n to insert on Src and/or Dest */
+	bool		initSrc;		/* re-init the Src page? */
+	bool		initDest;		/* re-init the Dest page? */
+
+	/* where to put new inner tuple */
+	OffsetNumber offnumInner;
+	bool		initInner;		/* re-init the Inner page? */
+
+	bool		storesNulls;	/* pages are in the nulls tree? */
+
+	/* where the parent downlink is, if any */
+	bool		innerIsParent;	/* is parent the same as inner page? */
+	OffsetNumber offnumParent;
+	uint16		nodeI;
+
+	spgxlogState stateSrc;
+
+	/*----------
+	 * data follows:
+	 *		array of deleted tuple numbers, length nDelete
+	 *		array of inserted tuple numbers, length nInsert
+	 *		array of page selector bytes for inserted tuples, length nInsert
+	 *		new inner tuple (unaligned!)
+	 *		list of leaf tuples, length nInsert (unaligned!)
+	 *----------
+	 */
+	OffsetNumber offsets[FLEXIBLE_ARRAY_MEMBER];
+} spgxlogPickSplit;
+
+#define SizeOfSpgxlogPickSplit offsetof(spgxlogPickSplit, offsets)
+
+typedef struct spgxlogVacuumLeaf
+{
+	uint16		nDead;			/* number of tuples to become DEAD */
+	uint16		nPlaceholder;	/* number of tuples to become PLACEHOLDER */
+	uint16		nMove;			/* number of tuples to move */
+	uint16		nChain;			/* number of tuples to re-chain */
+
+	spgxlogState stateSrc;
+
+	/*----------
+	 * data follows:
+	 *		tuple numbers to become DEAD
+	 *		tuple numbers to become PLACEHOLDER
+	 *		tuple numbers to move from (and replace with PLACEHOLDER)
+	 *		tuple numbers to move to (replacing what is there)
+	 *		tuple numbers to update nextOffset links of
+	 *		tuple numbers to insert in nextOffset links
+	 *----------
+	 */
+	OffsetNumber offsets[FLEXIBLE_ARRAY_MEMBER];
+} spgxlogVacuumLeaf;
+
+#define SizeOfSpgxlogVacuumLeaf offsetof(spgxlogVacuumLeaf, offsets)
+
+typedef struct spgxlogVacuumRoot
+{
+	/* vacuum a root page when it is also a leaf */
+	uint16		nDelete;		/* number of tuples to delete */
+
+	spgxlogState stateSrc;
+
+	/* offsets of tuples to delete follow */
+	OffsetNumber offsets[FLEXIBLE_ARRAY_MEMBER];
+} spgxlogVacuumRoot;
+
+#define SizeOfSpgxlogVacuumRoot offsetof(spgxlogVacuumRoot, offsets)
+
+typedef struct spgxlogVacuumRedirect
+{
+	uint16		nToPlaceholder; /* number of redirects to make placeholders */
+	OffsetNumber firstPlaceholder;	/* first placeholder tuple to remove */
+	TransactionId newestRedirectXid;	/* newest XID of removed redirects */
+
+	/* offsets of redirect tuples to make placeholders follow */
+	OffsetNumber offsets[FLEXIBLE_ARRAY_MEMBER];
+} spgxlogVacuumRedirect;
+
+#define SizeOfSpgxlogVacuumRedirect offsetof(spgxlogVacuumRedirect, offsets)
+
+extern void spg_redo(XLogReaderState *record);
+extern void spg_desc(StringInfo buf, XLogReaderState *record);
+extern const char *spg_identify(uint8 info);
+extern void spg_xlog_startup(void);
+extern void spg_xlog_cleanup(void);
+extern void spg_mask(char *pagedata, BlockNumber blkno);
+
+#endif							/* SPGXLOG_H */