!5831 新增Generic WAL接口(为实现自定义访问方法的扩展供访问WAL的接口)

Merge pull request !5831 from 吉文克/datavec-0.7.2

contrib/CMakeLists.txt

@@ -25,6 +25,7 @@ set(CMAKE_MODULE_PATH
     ${CMAKE_CURRENT_SOURCE_DIR}/gc_fdw
     ${CMAKE_CURRENT_SOURCE_DIR}/ndpplugin
     ${CMAKE_CURRENT_SOURCE_DIR}/spq_plugin
+    ${CMAKE_CURRENT_SOURCE_DIR}/datavec
     ${CMAKE_CURRENT_SOURCE_DIR}/gms_stats
     ${CMAKE_CURRENT_SOURCE_DIR}/gms_profiler
 )
@@ -53,4 +54,7 @@ add_subdirectory(ndpplugin)
 if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/spq_plugin)
     add_subdirectory(spq_plugin)
 endif()
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/datavec)
+    add_subdirectory(datavec)
+endif()
 add_subdirectory(gms_profiler)

contrib/pg_xlogdump/CMakeLists.txt

@@ -4,6 +4,7 @@ execute_process(
     COMMAND ln -fs ${PROJECT_SRC_DIR}/gausskernel/storage/access/rmgrdesc/barrierdesc.cpp ${CMAKE_CURRENT_SOURCE_DIR}/barrierdesc.cpp
     COMMAND ln -fs ${PROJECT_SRC_DIR}/gausskernel/storage/access/rmgrdesc/clogdesc.cpp ${CMAKE_CURRENT_SOURCE_DIR}/clogdesc.cpp
     COMMAND ln -fs ${PROJECT_SRC_DIR}/gausskernel/storage/access/rmgrdesc/dbasedesc.cpp ${CMAKE_CURRENT_SOURCE_DIR}/dbasedesc.cpp
+    COMMAND ln -fs ${PROJECT_SRC_DIR}/gausskernel/storage/access/rmgrdesc/genericdesc.cpp ${CMAKE_CURRENT_SOURCE_DIR}/genericdesc.cpp
     COMMAND ln -fs ${PROJECT_SRC_DIR}/gausskernel/storage/access/rmgrdesc/gindesc.cpp ${CMAKE_CURRENT_SOURCE_DIR}/gindesc.cpp
     COMMAND ln -fs ${PROJECT_SRC_DIR}/gausskernel/storage/access/rmgrdesc/gistdesc.cpp ${CMAKE_CURRENT_SOURCE_DIR}/gistdesc.cpp
     COMMAND ln -fs ${PROJECT_SRC_DIR}/gausskernel/storage/access/rmgrdesc/hashdesc.cpp ${CMAKE_CURRENT_SOURCE_DIR}/hashdesc.cpp

contrib/pg_xlogdump/rmgrdesc.cpp

@@ -10,6 +10,7 @@
 #include "knl/knl_variable.h"
 
 #include "access/clog.h"
+#include "access/generic_xlog.h"
 #include "access/gin.h"
 #include "access/gist_private.h"
 #include "access/hash.h"

src/common/backend/parser/parse_utilcmd.cpp

@@ -4340,6 +4340,7 @@ IndexStmt* transformIndexStmt(Oid relid, IndexStmt* stmt, const char* queryStrin
             (0 != pg_strcasecmp(stmt->accessMethod, DEFAULT_GIN_INDEX_TYPE)) &&
             (0 != pg_strcasecmp(stmt->accessMethod, DEFAULT_GIST_INDEX_TYPE)) &&
             (0 != pg_strcasecmp(stmt->accessMethod, DEFAULT_IVFFLAT_INDEX_TYPE)) &&
+            (0 != pg_strcasecmp(stmt->accessMethod, DEFAULT_HNSW_INDEX_TYPE)) &&
             (0 != pg_strcasecmp(stmt->accessMethod, DEFAULT_USTORE_INDEX_TYPE)) &&
             (0 != pg_strcasecmp(stmt->accessMethod, DEFAULT_HASH_INDEX_TYPE))) {
             /* row store only support btree/ubtree/gin/gist/hash index */

src/common/backend/utils/init/globals.cpp

@@ -76,7 +76,7 @@ bool will_shutdown = false;
  *
  ********************************************/
 
-const uint32 GRAND_VERSION_NUM = 92942;
+const uint32 GRAND_VERSION_NUM = 92943;
 
 /********************************************
  * 2.VERSION NUM FOR EACH FEATURE
@@ -96,6 +96,7 @@ const uint32 PUBLICATION_DDL_VERSION_NUM = 92921;
 const uint32 UPSERT_ALIAS_VERSION_NUM = 92920;
 const uint32 SUPPORT_GS_DEPENDENCY_VERSION_NUM = 92916;
 const uint32 SPQ_VERSION_NUM = 92915;
+const uint32 GENERICXLOG_VERSION_NUM = 92943;
 const uint32 PARTITION_ACCESS_EXCLUSIVE_LOCK_UPGRADE_VERSION = 92913;
 const uint32 PAGE_DIST_VERSION_NUM = 92912;
 const uint32 NODE_REFORM_INFO_VERSION_NUM = 92911;

src/gausskernel/storage/access/rmgrdesc/Makefile

@@ -11,12 +11,12 @@ ifneq "$(MAKECMDGOALS)" "clean"
 endif
 
 ifeq ($(enable_mot), yes)
-OBJS = barrierdesc.o clogdesc.o dbasedesc.o gindesc.o gistdesc.o \
+OBJS = barrierdesc.o clogdesc.o dbasedesc.o genericdesc.o gindesc.o gistdesc.o \
 	   hashdesc.o heapdesc.o motdesc.o mxactdesc.o nbtdesc.o relmapdesc.o \
 	   replorigindesc.o seqdesc.o smgrdesc.o spgdesc.o standbydesc.o tblspcdesc.o \
 	   xactdesc.o xlogdesc.o slotdesc.o undologdesc.o uheapdesc.o segpagedesc.o logicalddlmsgdesc.o
 else
-OBJS = barrierdesc.o clogdesc.o dbasedesc.o gindesc.o gistdesc.o \
+OBJS = barrierdesc.o clogdesc.o dbasedesc.o genericdesc.o gindesc.o gistdesc.o \
 	   hashdesc.o heapdesc.o mxactdesc.o nbtdesc.o relmapdesc.o \
 	   replorigindesc.o seqdesc.o smgrdesc.o spgdesc.o standbydesc.o tblspcdesc.o \
 	   xactdesc.o xlogdesc.o slotdesc.o undologdesc.o uheapdesc.o segpagedesc.o logicalddlmsgdesc.o

src/gausskernel/storage/access/rmgrdesc/genericdesc.cpp

@@ -0,0 +1,59 @@
+/*-------------------------------------------------------------------------
+ *
+ * genericdesc.cpp
+ *    rmgr descriptor routines for access/transam/generic_xlog.cpp
+ *
+ * Portions Copyright (c) 2024 Huawei Technologies Co.,Ltd.
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/gausskernel/storage/access/rmgrdesc/genericdesc.cpp
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "access/generic_xlog.h"
+#include "lib/stringinfo.h"
+#include "storage/smgr/relfilenode.h"
+
+/*
+ * Description of generic xlog record: write page regions that this record
+ * overrides.
+ */
+void
+generic_desc(StringInfo buf, XLogReaderState *record)
+{
+    errno_t ret = EOK;
+    Pointer ptr = XLogRecGetData(record),
+        end = ptr + XLogRecGetDataLen(record);
+
+    while (ptr < end) {
+        OffsetNumber offset, length;
+
+        ret = memcpy_s(&offset, sizeof(offset), ptr, sizeof(offset));
+        securec_check(ret, "\0", "\0");
+        ptr += sizeof(offset);
+        ret = memcpy_s(&length, sizeof(length), ptr, sizeof(length));
+        securec_check(ret, "\0", "\0");
+        ptr += sizeof(length);
+        ptr += length;
+
+        if (ptr < end)
+            appendStringInfo(buf, "offset %u, length %u; ", offset, length);
+        else
+            appendStringInfo(buf, "offset %u, length %u", offset, length);
+    }
+
+    return;
+}
+
+/*
+ * Identification of generic xlog record: we don't distinguish any subtypes
+ * inside generic xlog records.
+ */
+const char *
+generic_identify(uint8 info)
+{
+    return "Generic";
+}

src/gausskernel/storage/access/transam/CMakeLists.txt

@@ -6,6 +6,7 @@ list(APPEND TGT_transam_SRC
     ${CMAKE_CURRENT_SOURCE_DIR}/csnlog.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/double_write.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/extreme_rto_redo_api.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/generic_xlog.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/single_double_write.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/multi_redo_api.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/multi_redo_settings.cpp

src/gausskernel/storage/access/transam/Makefile

@@ -12,12 +12,12 @@ endif
 ifeq ($(enable_multiple_nodes), yes)
 OBJS = clog.o multixact.o rmgr.o slru.o csnlog.o transam.o twophase.o \
 	twophase_rmgr.o varsup.o double_write.o single_double_write.o seg_double_write.o redo_statistic.o multi_redo_api.o multi_redo_settings.o\
-	xact.o xlog.o xlogfuncs.o extreme_rto_redo_api.o \
+	xact.o xlog.o xlogfuncs.o extreme_rto_redo_api.o generic_xlog.o \
 	xloginsert.o xlogreader.o xlogutils.o cbmparsexlog.o cbmfuncs.o
 else
 OBJS = clog.o gtm_single.o multixact.o rmgr.o slru.o csnlog.o transam.o twophase.o \
 	twophase_rmgr.o varsup.o double_write.o single_double_write.o seg_double_write.o redo_statistic.o multi_redo_api.o multi_redo_settings.o\
-	xact.o xlog.o xlogfuncs.o extreme_rto_redo_api.o \
+	xact.o xlog.o xlogfuncs.o extreme_rto_redo_api.o generic_xlog.o \
 	xloginsert.o xlogreader.o xlogutils.o cbmparsexlog.o cbmfuncs.o
 endif
 

src/gausskernel/storage/access/transam/generic_xlog.cpp

@@ -0,0 +1,430 @@
+/*-------------------------------------------------------------------------
+ *
+ * generic_xlog.cpp
+ *   Implementation of generic xlog records.
+ *
+ * Portions Copyright (c) 2024 Huawei Technologies Co.,Ltd.
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/gausskernel/storage/access/transam/generic_xlog.cpp
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "access/generic_xlog.h"
+#include "access/xlogproc.h"
+#include "miscadmin.h"
+#include "utils/memutils.h"
+
+/*-------------------------------------------------------------------------
+ * Internally, a delta between pages consists of a set of fragments.  Each
+ * fragment represents changes made in a given region of a page.  A fragment
+ * is made up as follows:
+ *
+ * - offset of page region (OffsetNumber)
+ * - length of page region (OffsetNumber)
+ * - data - the data to place into the region ('length' number of bytes)
+ *
+ * Unchanged regions of a page are not represented in its delta.  As a
+ * result, a delta can be more compact than the full page image.  But having
+ * an unchanged region in the middle of two fragments that is smaller than
+ * the fragment header (offset and length) does not pay off in terms of the
+ * overall size of the delta. For this reason, we break fragments only if
+ * the unchanged region is bigger than MATCH_THRESHOLD.
+ *
+ * The worst case for delta sizes occurs when we did not find any unchanged
+ * region in the page.  The size of the delta will be the size of the page plus
+ * the size of the fragment header in that case.
+ *-------------------------------------------------------------------------
+ */
+#define FRAGMENT_HEADER_SIZE    (2 * sizeof(OffsetNumber))
+#define MATCH_THRESHOLD         FRAGMENT_HEADER_SIZE
+#define MAX_DELTA_SIZE          BLCKSZ + FRAGMENT_HEADER_SIZE
+
+/* Struct of generic xlog data for single page */
+typedef struct
+{
+    Buffer buffer;         /* registered buffer */
+    char image[BLCKSZ];  /* copy of page image for modification */
+    char data[MAX_DELTA_SIZE]; /* delta between page images */
+    int dataLen;        /* space consumed in data field */
+    int flags; /* flags for this buffer */
+} PageData;
+
+/* State of generic xlog record construction */
+struct GenericXLogState
+{
+    bool isLogged;
+    PageData pages[MAX_GENERIC_XLOG_PAGES];
+};
+
+static void writeFragment(PageData *pageData, OffsetNumber offset,
+                          OffsetNumber len, Pointer data);
+static void writeDelta(PageData *pageData);
+static void applyPageRedo(Page page, Pointer data, Size dataSize);
+
+/*
+ * Write next fragment into delta.
+ */
+static void
+writeFragment(PageData *pageData, OffsetNumber offset, OffsetNumber length,
+              Pointer data)
+{
+    errno_t ret = EOK;
+    Pointer ptr = pageData->data + pageData->dataLen;
+
+    /* Check if we have enough space */
+    Assert(pageData->dataLen + sizeof(offset) +
+           sizeof(length) + length <= sizeof(pageData->data));
+
+    /* Write fragment data */
+    ret = memcpy_s(ptr, MAX_DELTA_SIZE, &offset, sizeof(offset));
+    securec_check(ret, "\0", "\0");
+    ptr += sizeof(offset);
+    ret = memcpy_s(ptr, MAX_DELTA_SIZE - sizeof(offset), &length, sizeof(length));
+    securec_check(ret, "\0", "\0");
+    ptr += sizeof(length);
+    ret = memcpy_s(ptr, MAX_DELTA_SIZE - sizeof(offset) - sizeof(length), data, length);
+    securec_check(ret, "\0", "\0");
+    ptr += length;
+
+    pageData->dataLen = ptr - pageData->data;
+}
+
+/*
+ * Make delta for given page.
+ */
+static void
+writeDelta(PageData *pageData)
+{
+    Page page = BufferGetPage(pageData->buffer),
+         image = (Page) pageData->image;
+    int i, fragmentBegin = -1, fragmentEnd = -1;
+    uint16 pageLower = ((PageHeader) page)->pd_lower,
+           pageUpper = ((PageHeader) page)->pd_upper,
+           imageLower = ((PageHeader) image)->pd_lower,
+           imageUpper = ((PageHeader) image)->pd_upper;
+
+    for (i = 0; i < BLCKSZ; i++) {
+        bool match;
+
+        /*
+         * Check if bytes in old and new page images match.  We do not care
+         * about data in the unallocated area between pd_lower and pd_upper.
+         * We assume the unallocated area to expand with unmatched bytes.
+         * Bytes inside the unallocated area are assumed to always match.
+         */
+        if (i < pageLower) {
+            if (i < imageLower)
+                match = (page[i] == image[i]);
+            else
+                match = false;
+        } else if (i >= pageUpper) {
+            if (i >= imageUpper)
+                match = (page[i] == image[i]);
+            else
+                match = false;
+        } else {
+            match = true;
+        }
+
+        if (match) {
+            if (fragmentBegin >= 0) {
+                /* Matched byte is potentially part of a fragment. */
+                if (fragmentEnd < 0)
+                    fragmentEnd = i;
+
+                /*
+                 * Write next fragment if sequence of matched bytes is longer
+                 * than MATCH_THRESHOLD.
+                 */
+                if (i - fragmentEnd >= MATCH_THRESHOLD) {
+                    writeFragment(pageData, fragmentBegin,
+                                  fragmentEnd - fragmentBegin,
+                                  page + fragmentBegin);
+                    fragmentBegin = -1;
+                    fragmentEnd = -1;
+                }
+            }
+        } else {
+            /* On unmatched byte, start new fragment if it is not done yet */
+            if (fragmentBegin < 0)
+                fragmentBegin = i;
+            fragmentEnd = -1;
+        }
+    }
+
+    if (fragmentBegin >= 0)
+        writeFragment(pageData, fragmentBegin, BLCKSZ - fragmentBegin, page + fragmentBegin);
+
+#ifdef WAL_DEBUG
+    /*
+     * If xlog debug is enabled, then check produced delta.  Result of delta
+     * application to saved image should be the same as current page state.
+     */
+    if (XLOG_DEBUG) {
+        errno_t ret = EOK;
+        char tmp[BLCKSZ];
+        ret = memcpy_s(tmp, BLCKSZ, image, BLCKSZ);
+        securec_check(ret, "\0", "\0");
+        applyPageRedo(tmp, pageData->data, pageData->dataLen);
+        if (memcmp(tmp, page, pageLower)
+            || memcmp(tmp + pageUpper, page + pageUpper, BLCKSZ - pageUpper))
+            elog(ERROR, "result of generic xlog apply does not match");
+    }
+#endif
+}
+
+/*
+ * Start new generic xlog record.
+ */
+GenericXLogState *
+GenericXLogStart(Relation relation)
+{
+    int i;
+    GenericXLogState *state;
+
+    if (t_thrd.proc->workingVersionNum < GENERICXLOG_VERSION_NUM) {
+        elog(ERROR, "workingVersionNum is lowwer than GENERICXLOG_VERSION_NUM, not supported!");
+        return NULL;
+    }
+
+    state = (GenericXLogState *) palloc(sizeof(GenericXLogState));
+
+    state->isLogged = RelationNeedsWAL(relation);
+    for (i = 0; i < MAX_GENERIC_XLOG_PAGES; i++)
+        state->pages[i].buffer = InvalidBuffer;
+
+    return state;
+}
+
+/*
+ * Register new buffer for generic xlog record.
+ */
+Page
+GenericXLogRegisterBuffer(GenericXLogState *state, Buffer buffer, int flags)
+{
+    errno_t ret = EOK;
+    int block_id;
+
+    if (state == NULL) {
+        elog(ERROR, "GenericXLogState invalid!");
+        return NULL;
+    }
+
+    /* Place new buffer to unused slot in array */
+    for (block_id = 0; block_id < MAX_GENERIC_XLOG_PAGES; block_id++) {
+        PageData *page = &state->pages[block_id];
+        if (BufferIsInvalid(page->buffer)) {
+            page->buffer = buffer;
+            ret = memcpy_s(page->image, BLCKSZ, BufferGetPage(buffer), BLCKSZ);
+            securec_check(ret, "\0", "\0");
+            page->dataLen = 0;
+            page->flags = flags;
+            return (Page)page->image;
+        } else if (page->buffer == buffer) {
+            /*
+             * Buffer is already registered.  Just return the image, which is
+             * already prepared.
+             */
+            return (Page)page->image;
+        }
+    }
+
+    elog(ERROR, "maximum number of %d generic xlog buffers is exceeded",
+         MAX_GENERIC_XLOG_PAGES);
+
+    /* keep compiler quiet */
+    return NULL;
+}
+
+/*
+ * Unregister particular buffer for generic xlog record.
+ */
+void
+GenericXLogUnregister(GenericXLogState *state, Buffer buffer)
+{
+    int block_id;
+
+        if (state == NULL) {
+            elog(ERROR, "GenericXLogState invalid!");
+            return;
+        }
+
+    /* Find block in array to unregister */
+    for (block_id = 0; block_id < MAX_GENERIC_XLOG_PAGES; block_id++) {
+        if (state->pages[block_id].buffer == buffer) {
+            /*
+             * Preserve order of pages in array because it could matter for
+             * concurrency.
+             */
+            int ret = memmove_s(&state->pages[block_id], (MAX_GENERIC_XLOG_PAGES - block_id - 1) * sizeof(PageData), &state->pages[block_id + 1],
+                    (MAX_GENERIC_XLOG_PAGES - block_id - 1) * sizeof(PageData));
+            securec_check(ret, "\0", "\0");
+            state->pages[MAX_GENERIC_XLOG_PAGES - 1].buffer = InvalidBuffer;
+            return;
+        }
+    }
+
+    elog(ERROR, "registered generic xlog buffer not found");
+}
+
+/*
+ * Put all changes in registered buffers to generic xlog record.
+ */
+XLogRecPtr
+GenericXLogFinish(GenericXLogState *state)
+{
+    XLogRecPtr lsn = InvalidXLogRecPtr;
+    int i;
+    errno_t ret = EOK;
+
+    Assert(state != NULL);
+
+    if (state->isLogged) {
+        /* Logged relation: make xlog record in critical section. */
+        XLogBeginInsert();
+
+        START_CRIT_SECTION();
+
+        for (i = 0; i < MAX_GENERIC_XLOG_PAGES; i++) {
+            char tmp[BLCKSZ];
+            PageData *page = &state->pages[i];
+
+            if (BufferIsInvalid(page->buffer))
+                continue;
+
+            /* Swap current and saved page image. */
+            ret = memcpy_s(tmp, BLCKSZ, page->image, BLCKSZ);
+            securec_check(ret, "\0", "\0");
+            ret = memcpy_s(page->image, BLCKSZ, BufferGetPage(page->buffer), BLCKSZ);
+            securec_check(ret, "\0", "\0");
+            ret = memcpy_s(BufferGetPage(page->buffer), BLCKSZ, tmp, BLCKSZ);
+            securec_check(ret, "\0", "\0");
+
+            if (page->flags & GENERIC_XLOG_FULL_IMAGE) {
+                /* A full page image does not require anything special */
+                XLogRegisterBuffer(i, page->buffer, REGBUF_FORCE_IMAGE);
+            } else {
+                /*
+                 * In normal mode, calculate delta and write it as data
+                 * associated with this page.
+                 */
+                XLogRegisterBuffer(i, page->buffer, REGBUF_STANDARD);
+                writeDelta(page);
+                XLogRegisterBufData(i, page->data, page->dataLen);
+            }
+        }
+
+        /* Insert xlog record */
+        lsn = XLogInsert(RM_GENERIC_ID, 0);
+
+        /* Set LSN and mark buffers dirty */
+        for (i = 0; i < MAX_GENERIC_XLOG_PAGES; i++) {
+            PageData *page = &state->pages[i];
+
+            if (BufferIsInvalid(page->buffer))
+                continue;
+            PageSetLSN(BufferGetPage(page->buffer), lsn);
+            MarkBufferDirty(page->buffer);
+        }
+        END_CRIT_SECTION();
+    } else {
+        /* Unlogged relation: skip xlog-related stuff */
+        START_CRIT_SECTION();
+        for (i = 0; i < MAX_GENERIC_XLOG_PAGES; i++) {
+            PageData *page = &state->pages[i];
+
+            if (BufferIsInvalid(page->buffer))
+                continue;
+            ret = memcpy_s(BufferGetPage(page->buffer), BLCKSZ, page->image, BLCKSZ);
+            securec_check(ret, "\0", "\0");
+            MarkBufferDirty(page->buffer);
+        }
+        END_CRIT_SECTION();
+    }
+
+    pfree(state);
+
+    return lsn;
+}
+
+/*
+ * Abort generic xlog record.
+ */
+void
+GenericXLogAbort(GenericXLogState *state)
+{
+    pfree(state);
+}
+
+/*
+ * Apply delta to given page image.
+ */
+static void
+applyPageRedo(Page page, Pointer data, Size dataSize)
+{
+    errno_t ret = EOK;
+    Pointer ptr = data, end = data + dataSize;
+
+    while (ptr < end) {
+        OffsetNumber offset, length;
+
+        ret = memcpy_s(&offset, sizeof(offset), ptr, sizeof(offset));
+        securec_check(ret, "\0", "\0");
+        ptr += sizeof(offset);
+        ret =memcpy_s(&length, sizeof(length), ptr, sizeof(length));
+        securec_check(ret, "\0", "\0");
+        ptr += sizeof(length);
+
+        ret = memcpy_s(page + offset, length, ptr, length);
+        securec_check(ret, "\0", "\0");
+
+        ptr += length;
+    }
+}
+
+/*
+ * Redo function for generic xlog record.
+ */
+void
+generic_redo(XLogReaderState *record)
+{
+    uint8 block_id;
+    RedoBufferInfo buffers[MAX_GENERIC_XLOG_PAGES];
+    XLogRecPtr lsn = record->EndRecPtr;
+
+    Assert(record->max_block_id < MAX_GENERIC_XLOG_PAGES);
+
+    /* Iterate over blocks */
+    for (block_id = 0; block_id <= record->max_block_id; block_id++) {
+        XLogRedoAction action;
+
+        if (!XLogRecHasBlockRef(record, block_id))
+            continue;
+
+        action = XLogReadBufferForRedo(record, block_id, &buffers[block_id]);
+
+        /* Apply redo to given block if needed */
+        if (action == BLK_NEEDS_REDO) {
+            Pointer blockData;
+            Size blockDataSize;
+            Page page;
+
+            page = BufferGetPage(buffers[block_id].buf);
+            blockData = XLogRecGetBlockData(record, block_id, &blockDataSize);
+            applyPageRedo(page, blockData, blockDataSize);
+
+            PageSetLSN(page, lsn);
+            MarkBufferDirty(buffers[block_id].buf);
+        }
+    }
+
+    /* Changes are done: unlock and release all buffers */
+    for (block_id = 0; block_id <= record->max_block_id; block_id++) {
+        if (BufferIsValid(buffers[block_id].buf))
+            UnlockReleaseBuffer(buffers[block_id].buf);
+    }
+}

src/gausskernel/storage/access/transam/rmgr.cpp

@@ -26,6 +26,7 @@
 #include "knl/knl_variable.h"
 
 #include "access/clog.h"
+#include "access/generic_xlog.h"
 #include "access/gin.h"
 #include "access/gist_private.h"
 #include "access/hash.h"

src/include/access/generic_xlog.h

@@ -0,0 +1,39 @@
+/*-------------------------------------------------------------------------
+ *
+ * generic_xlog.h
+ *	  Generic xlog API definition.
+ *
+ * src/include/access/generic_xlog.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef GENERIC_XLOG_H
+#define GENERIC_XLOG_H
+
+#include "access/xlog.h"
+#include "access/xlog_internal.h"
+#include "access/xloginsert.h"
+#include "storage/buf/bufpage.h"
+#include "utils/rel.h"
+
+#define MAX_GENERIC_XLOG_PAGES	XLR_NORMAL_MAX_BLOCK_ID
+#define GENERIC_XLOG_FULL_IMAGE 0x0001 /* write full-page image */
+
+/* state of generic xlog record construction */
+struct GenericXLogState;
+typedef struct GenericXLogState GenericXLogState;
+
+/* API for construction of generic xlog records */
+extern GenericXLogState *GenericXLogStart(Relation relation);
+extern Page GenericXLogRegisterBuffer(GenericXLogState *state, Buffer buffer,
+				int flags);
+extern void GenericXLogUnregister(GenericXLogState *state, Buffer buffer);
+extern XLogRecPtr GenericXLogFinish(GenericXLogState *state);
+extern void GenericXLogAbort(GenericXLogState *state);
+
+/* functions defined for rmgr */
+extern void generic_redo(XLogReaderState *record);
+extern const char *generic_identify(uint8 info);
+extern void generic_desc(StringInfo buf, XLogReaderState *record);
+
+#endif   /* GENERIC_XLOG_H */

src/include/access/rmgrlist.h

@@ -82,3 +82,4 @@ PG_RMGR(RM_COMPRESSION_REL_ID, "CompressionRelation", CfsShrinkRedo, CfsShrinkDe
     CfsShrinkTypeName)
 PG_RMGR(RM_LOGICALDDLMSG_ID, "LogicalDDLMessage", logicalddlmsg_redo, logicalddlmsg_desc, NULL, NULL, NULL, NULL, NULL, \
     logicalddlmsg_type_name)
+PG_RMGR(RM_GENERIC_ID, "Generic", generic_redo, generic_desc, NULL, NULL, NULL, NULL, NULL, NULL)

src/include/catalog/index.h

@@ -29,6 +29,7 @@
 #define CSTORE_GINBTREE_INDEX_TYPE "cgin"
 #define DEFAULT_USTORE_INDEX_TYPE "ubtree"
 #define DEFAULT_IVFFLAT_INDEX_TYPE "ivfflat"
+#define DEFAULT_HNSW_INDEX_TYPE "hnsw"
 
 /* Typedef for callback function for IndexBuildHeapScan */
 typedef void (*IndexBuildCallback)(Relation index, HeapTuple htup, Datum *values, const bool *isnull,

src/include/lib/simplehash.h

@@ -300,23 +300,6 @@ SH_SCOPE void SH_STAT(SH_TYPE *tb);
 
 #endif
 
-/* calculate ceil(log base 2) of num */
-static inline uint64 sh_log2(uint64 num)
-{
-    int i;
-    uint64 limit;
-
-    for (i = 0, limit = 1; limit < num; i++, limit <<= 1)
-        ;
-    return i;
-}
-
-/* calculate first power of 2 >= num */
-static inline uint64 sh_pow2(uint64 num)
-{
-    return ((uint64)1) << sh_log2(num);
-}
-
 /*
  * Compute sizing parameters for hashtable. Called when creating and growing
  * the hashtable.

src/include/miscadmin.h

@@ -141,6 +141,7 @@ extern const uint32 CREATE_TABLE_AS_VERSION_NUM;
 extern const uint32 GB18030_2022_VERSION_NUM;
 extern const uint32 PARTITION_ACCESS_EXCLUSIVE_LOCK_UPGRADE_VERSION;
 extern const uint32 SPQ_VERSION_NUM;
+extern const uint32 GENERICXLOG_VERSION_NUM;
 extern const uint32 UPSERT_ALIAS_VERSION_NUM;
 extern const uint32 SELECT_STMT_HAS_USERVAR;
 extern const uint32 PUBLICATION_DDL_VERSION_NUM;

src/include/port/pg_bitutils.h

@@ -159,4 +159,21 @@ static inline uint32 pg_rotate_right32(uint32 word, int n)
     return (word >> n) | (word << (sizeof(word) * BITS_PER_BYTE - n));
 }
 
+/* calculate ceil(log base 2) of num */
+static inline uint64 sh_log2(uint64 num)
+{
+    int i;
+    uint64 limit;
+
+    for (i = 0, limit = 1; limit < num; i++, limit <<= 1)
+        ;
+    return i;
+}
+
+/* calculate first power of 2 >= num */
+static inline uint64 sh_pow2(uint64 num)
+{
+    return ((uint64)1) << sh_log2(num);
+}
+
 #endif							/* PG_BITUTILS_H */