From af6b150041ff399fda83cf9c43da880e8d850921 Mon Sep 17 00:00:00 2001
From: Robert Haas <rhaas@postgresql.org>
Date: Wed, 20 Sep 2023 13:55:28 -0400
Subject: [PATCH v6 2/3] Minimally add XLOG_CHECKPOINT_REDO.

Not to be committed separately.

Based on a previous patch by Dilip Kumar.
---
 src/backend/access/rmgrdesc/xlogdesc.c   | 7 +++++++
 src/backend/access/transam/xlog.c        | 4 ++++
 src/backend/replication/logical/decode.c | 1 +
 src/include/catalog/pg_control.h         | 1 +
 4 files changed, 13 insertions(+)

diff --git a/src/backend/access/rmgrdesc/xlogdesc.c b/src/backend/access/rmgrdesc/xlogdesc.c
index f390c177e4..37f59bda7e 100644
--- a/src/backend/access/rmgrdesc/xlogdesc.c
+++ b/src/backend/access/rmgrdesc/xlogdesc.c
@@ -148,6 +148,10 @@ xlog_desc(StringInfo buf, XLogReaderState *record)
 						 LSN_FORMAT_ARGS(xlrec.overwritten_lsn),
 						 timestamptz_to_str(xlrec.overwrite_time));
 	}
+	else if (info == XLOG_CHECKPOINT_REDO)
+	{
+		/* No details to write out */
+	}
 }
 
 const char *
@@ -196,6 +200,9 @@ xlog_identify(uint8 info)
 		case XLOG_FPI_FOR_HINT:
 			id = "FPI_FOR_HINT";
 			break;
+		case XLOG_CHECKPOINT_REDO:
+			id = "CHECKPOINT_REDO";
+			break;
 	}
 
 	return id;
diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 348cbebe3a..026e2fc9da 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -8102,6 +8102,10 @@ xlog_redo(XLogReaderState *record)
 		/* Keep track of full_page_writes */
 		lastFullPageWrites = fpw;
 	}
+	else if (info == XLOG_CHECKPOINT_REDO)
+	{
+		/* nothing to do here, just for informational purposes */
+	}
 }
 
 /*
diff --git a/src/backend/replication/logical/decode.c b/src/backend/replication/logical/decode.c
index 730061c9da..24b712aa66 100644
--- a/src/backend/replication/logical/decode.c
+++ b/src/backend/replication/logical/decode.c
@@ -190,6 +190,7 @@ xlog_decode(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
 		case XLOG_FPI_FOR_HINT:
 		case XLOG_FPI:
 		case XLOG_OVERWRITE_CONTRECORD:
+		case XLOG_CHECKPOINT_REDO:
 			break;
 		default:
 			elog(ERROR, "unexpected RM_XLOG_ID record type: %u", info);
diff --git a/src/include/catalog/pg_control.h b/src/include/catalog/pg_control.h
index dc953977c5..1136613259 100644
--- a/src/include/catalog/pg_control.h
+++ b/src/include/catalog/pg_control.h
@@ -78,6 +78,7 @@ typedef struct CheckPoint
 #define XLOG_FPI						0xB0
 /* 0xC0 is used in Postgres 9.5-11 */
 #define XLOG_OVERWRITE_CONTRECORD		0xD0
+#define XLOG_CHECKPOINT_REDO			0xE0
 
 
 /*
-- 
2.37.1 (Apple Git-137.1)