Change internal queryid type from uint64 to int64

uint64 was perhaps chosen in cff440d36 as the type was uint32 prior to
that widening work.

Having this as uint64 doesn't make much sense and just adds the overhead of
having to remember that we always output this in its signed form.  Let's
remove that overhead.

The signed form output is seemingly required since we have no way to
represent the full range of uint64 in an SQL type.  We use BIGINT in places
like pg_stat_statements, which maps directly to int64.

The release notes "Source Code" section may want to mention this
adjustment as some extensions may wish to adjust their code.

Author: David Rowley <dgrowleyml@gmail.com>
Suggested-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: Sami Imseih <samimseih@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/50cb0c8b-994b-48f9-a1c4-13039eb3536b@eisentraut.org

16 files changed, 73 insertions, 55 deletions

diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index c58f34e9f30..129001c70c8 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -144,7 +144,7 @@ typedef struct pgssHashKey
 {
 	Oid			userid;			/* user OID */
 	Oid			dbid;			/* database OID */
-	uint64		queryid;		/* query identifier */
+	int64		queryid;		/* query identifier */
 	bool		toplevel;		/* query executed at top level */
 } pgssHashKey;
 
@@ -346,7 +346,7 @@ static void pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 								ProcessUtilityContext context, ParamListInfo params,
 								QueryEnvironment *queryEnv,
 								DestReceiver *dest, QueryCompletion *qc);
-static void pgss_store(const char *query, uint64 queryId,
+static void pgss_store(const char *query, int64 queryId,
 					   int query_location, int query_len,
 					   pgssStoreKind kind,
 					   double total_time, uint64 rows,
@@ -370,7 +370,7 @@ static char *qtext_fetch(Size query_offset, int query_len,
 						 char *buffer, Size buffer_size);
 static bool need_gc_qtexts(void);
 static void gc_qtexts(void);
-static TimestampTz entry_reset(Oid userid, Oid dbid, uint64 queryid, bool minmax_only);
+static TimestampTz entry_reset(Oid userid, Oid dbid, int64 queryid, bool minmax_only);
 static char *generate_normalized_query(JumbleState *jstate, const char *query,
 									   int query_loc, int *query_len_p);
 static void fill_in_constant_lengths(JumbleState *jstate, const char *query,
@@ -852,7 +852,7 @@ pgss_post_parse_analyze(ParseState *pstate, Query *query, JumbleState *jstate)
 	{
 		if (pgss_track_utility && IsA(query->utilityStmt, ExecuteStmt))
 		{
-			query->queryId = UINT64CONST(0);
+			query->queryId = INT64CONST(0);
 			return;
 		}
 	}
@@ -899,7 +899,7 @@ pgss_planner(Query *parse,
 	 */
 	if (pgss_enabled(nesting_level)
 		&& pgss_track_planning && query_string
-		&& parse->queryId != UINT64CONST(0))
+		&& parse->queryId != INT64CONST(0))
 	{
 		instr_time	start;
 		instr_time	duration;
@@ -1002,7 +1002,7 @@ pgss_ExecutorStart(QueryDesc *queryDesc, int eflags)
 	 * counting of optimizable statements that are directly contained in
 	 * utility statements.
 	 */
-	if (pgss_enabled(nesting_level) && queryDesc->plannedstmt->queryId != UINT64CONST(0))
+	if (pgss_enabled(nesting_level) && queryDesc->plannedstmt->queryId != INT64CONST(0))
 	{
 		/*
 		 * Set up to track total elapsed time in ExecutorRun.  Make sure the
@@ -1068,9 +1068,9 @@ pgss_ExecutorFinish(QueryDesc *queryDesc)
 static void
 pgss_ExecutorEnd(QueryDesc *queryDesc)
 {
-	uint64		queryId = queryDesc->plannedstmt->queryId;
+	int64		queryId = queryDesc->plannedstmt->queryId;
 
-	if (queryId != UINT64CONST(0) && queryDesc->totaltime &&
+	if (queryId != INT64CONST(0) && queryDesc->totaltime &&
 		pgss_enabled(nesting_level))
 	{
 		/*
@@ -1111,7 +1111,7 @@ pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 					DestReceiver *dest, QueryCompletion *qc)
 {
 	Node	   *parsetree = pstmt->utilityStmt;
-	uint64		saved_queryId = pstmt->queryId;
+	int64		saved_queryId = pstmt->queryId;
 	int			saved_stmt_location = pstmt->stmt_location;
 	int			saved_stmt_len = pstmt->stmt_len;
 	bool		enabled = pgss_track_utility && pgss_enabled(nesting_level);
@@ -1131,7 +1131,7 @@ pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 	 * only.
 	 */
 	if (enabled)
-		pstmt->queryId = UINT64CONST(0);
+		pstmt->queryId = INT64CONST(0);
 
 	/*
 	 * If it's an EXECUTE statement, we don't track it and don't increment the
@@ -1278,7 +1278,7 @@ pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
  * for the arrays in the Counters field.
  */
 static void
-pgss_store(const char *query, uint64 queryId,
+pgss_store(const char *query, int64 queryId,
 		   int query_location, int query_len,
 		   pgssStoreKind kind,
 		   double total_time, uint64 rows,
@@ -1304,7 +1304,7 @@ pgss_store(const char *query, uint64 queryId,
 	 * Nothing to do if compute_query_id isn't enabled and no other module
 	 * computed a query identifier.
 	 */
-	if (queryId == UINT64CONST(0))
+	if (queryId == INT64CONST(0))
 		return;
 
 	/*
@@ -1514,11 +1514,11 @@ pg_stat_statements_reset_1_7(PG_FUNCTION_ARGS)
 {
 	Oid			userid;
 	Oid			dbid;
-	uint64		queryid;
+	int64		queryid;
 
 	userid = PG_GETARG_OID(0);
 	dbid = PG_GETARG_OID(1);
-	queryid = (uint64) PG_GETARG_INT64(2);
+	queryid = PG_GETARG_INT64(2);
 
 	entry_reset(userid, dbid, queryid, false);
 
@@ -1530,12 +1530,12 @@ pg_stat_statements_reset_1_11(PG_FUNCTION_ARGS)
 {
 	Oid			userid;
 	Oid			dbid;
-	uint64		queryid;
+	int64		queryid;
 	bool		minmax_only;
 
 	userid = PG_GETARG_OID(0);
 	dbid = PG_GETARG_OID(1);
-	queryid = (uint64) PG_GETARG_INT64(2);
+	queryid = PG_GETARG_INT64(2);
 	minmax_only = PG_GETARG_BOOL(3);
 
 	PG_RETURN_TIMESTAMPTZ(entry_reset(userid, dbid, queryid, minmax_only));
@@ -2671,7 +2671,7 @@ if (e) { \
  * Reset entries corresponding to parameters passed.
  */
 static TimestampTz
-entry_reset(Oid userid, Oid dbid, uint64 queryid, bool minmax_only)
+entry_reset(Oid userid, Oid dbid, int64 queryid, bool minmax_only)
 {
 	HASH_SEQ_STATUS hash_seq;
 	pgssEntry  *entry;
@@ -2691,7 +2691,7 @@ entry_reset(Oid userid, Oid dbid, uint64 queryid, bool minmax_only)
 
 	stats_reset = GetCurrentTimestamp();
 
-	if (userid != 0 && dbid != 0 && queryid != UINT64CONST(0))
+	if (userid != 0 && dbid != 0 && queryid != INT64CONST(0))
 	{
 		/* If all the parameters are available, use the fast path. */
 		memset(&key, 0, sizeof(pgssHashKey));
@@ -2714,7 +2714,7 @@ entry_reset(Oid userid, Oid dbid, uint64 queryid, bool minmax_only)
 
 		SINGLE_ENTRY_RESET(entry);
 	}
-	else if (userid != 0 || dbid != 0 || queryid != UINT64CONST(0))
+	else if (userid != 0 || dbid != 0 || queryid != INT64CONST(0))
 	{
 		/* Reset entries corresponding to valid parameters. */
 		hash_seq_init(&hash_seq, pgss_hash);
diff --git a/src/backend/access/brin/brin.c b/src/backend/access/brin/brin.c
index 01e1db7f856..4204088fa0d 100644
--- a/src/backend/access/brin/brin.c
+++ b/src/backend/access/brin/brin.c
@@ -68,7 +68,7 @@ typedef struct BrinShared
 	int			scantuplesortstates;
 
 	/* Query ID, for report in worker processes */
-	uint64		queryid;
+	int64		queryid;
 
 	/*
 	 * workersdonecv is used to monitor the progress of workers.  All parallel
diff --git a/src/backend/access/nbtree/nbtsort.c b/src/backend/access/nbtree/nbtsort.c
index 3794cc924ad..9d70e89c1f3 100644
--- a/src/backend/access/nbtree/nbtsort.c
+++ b/src/backend/access/nbtree/nbtsort.c
@@ -105,7 +105,7 @@ typedef struct BTShared
 	int			scantuplesortstates;
 
 	/* Query ID, for report in worker processes */
-	uint64		queryid;
+	int64		queryid;
 
 	/*
 	 * workersdonecv is used to monitor the progress of workers.  All parallel
diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c
index bfa83fbc3fe..7e2792ead71 100644
--- a/src/backend/commands/explain.c
+++ b/src/backend/commands/explain.c
@@ -811,14 +811,10 @@ ExplainPrintPlan(ExplainState *es, QueryDesc *queryDesc)
 	 * the queryid in any of the EXPLAIN plans to keep stable the results
 	 * generated by regression test suites.
 	 */
-	if (es->verbose && queryDesc->plannedstmt->queryId != UINT64CONST(0) &&
+	if (es->verbose && queryDesc->plannedstmt->queryId != INT64CONST(0) &&
 		compute_query_id != COMPUTE_QUERY_ID_REGRESS)
 	{
-		/*
-		 * Output the queryid as an int64 rather than a uint64 so we match
-		 * what would be seen in the BIGINT pg_stat_statements.queryid column.
-		 */
-		ExplainPropertyInteger("Query Identifier", NULL, (int64)
+		ExplainPropertyInteger("Query Identifier", NULL,
 							   queryDesc->plannedstmt->queryId, es);
 	}
 }
diff --git a/src/backend/commands/vacuumparallel.c b/src/backend/commands/vacuumparallel.c
index 2b9d548cdeb..0feea1d30ec 100644
--- a/src/backend/commands/vacuumparallel.c
+++ b/src/backend/commands/vacuumparallel.c
@@ -63,7 +63,7 @@ typedef struct PVShared
 	 */
 	Oid			relid;
 	int			elevel;
-	uint64		queryid;
+	int64		queryid;
 
 	/*
 	 * Fields for both index vacuum and cleanup.
diff --git a/src/backend/nodes/gen_node_support.pl b/src/backend/nodes/gen_node_support.pl
index 77659b0f760..c8595109b0e 100644
--- a/src/backend/nodes/gen_node_support.pl
+++ b/src/backend/nodes/gen_node_support.pl
@@ -1039,6 +1039,11 @@ _read${n}(void)
 			print $off "\tWRITE_UINT_FIELD($f);\n";
 			print $rff "\tREAD_UINT_FIELD($f);\n" unless $no_read;
 		}
+		elsif ($t eq 'int64')
+		{
+			print $off "\tWRITE_INT64_FIELD($f);\n";
+			print $rff "\tREAD_INT64_FIELD($f);\n" unless $no_read;
+		}
 		elsif ($t eq 'uint64'
 			|| $t eq 'AclMode')
 		{
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index ceac3fd8620..25e08ba3426 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -51,6 +51,12 @@ static void outDouble(StringInfo str, double d);
 #define WRITE_UINT_FIELD(fldname) \
 	appendStringInfo(str, " :" CppAsString(fldname) " %u", node->fldname)
 
+/* Write a signed integer field (anything written with INT64_FORMAT) */
+#define WRITE_INT64_FIELD(fldname) \
+	appendStringInfo(str, \
+					 " :" CppAsString(fldname) " " INT64_FORMAT, \
+					 node->fldname)
+
 /* Write an unsigned integer field (anything written with UINT64_FORMAT) */
 #define WRITE_UINT64_FIELD(fldname) \
 	appendStringInfo(str, " :" CppAsString(fldname) " " UINT64_FORMAT, \
diff --git a/src/backend/nodes/queryjumblefuncs.c b/src/backend/nodes/queryjumblefuncs.c
index d1e82a63f09..ac3cb3d9caf 100644
--- a/src/backend/nodes/queryjumblefuncs.c
+++ b/src/backend/nodes/queryjumblefuncs.c
@@ -56,7 +56,7 @@ int			compute_query_id = COMPUTE_QUERY_ID_AUTO;
 bool		query_id_enabled = false;
 
 static JumbleState *InitJumble(void);
-static uint64 DoJumble(JumbleState *jstate, Node *node);
+static int64 DoJumble(JumbleState *jstate, Node *node);
 static void AppendJumble(JumbleState *jstate,
 						 const unsigned char *value, Size size);
 static void FlushPendingNulls(JumbleState *jstate);
@@ -141,12 +141,12 @@ JumbleQuery(Query *query)
 	 * If we are unlucky enough to get a hash of zero, use 1 instead for
 	 * normal statements and 2 for utility queries.
 	 */
-	if (query->queryId == UINT64CONST(0))
+	if (query->queryId == INT64CONST(0))
 	{
 		if (query->utilityStmt)
-			query->queryId = UINT64CONST(2);
+			query->queryId = INT64CONST(2);
 		else
-			query->queryId = UINT64CONST(1);
+			query->queryId = INT64CONST(1);
 	}
 
 	return jstate;
@@ -197,7 +197,7 @@ InitJumble(void)
  *		Jumble the given Node using the given JumbleState and return the resulting
  *		jumble hash.
  */
-static uint64
+static int64
 DoJumble(JumbleState *jstate, Node *node)
 {
 	/* Jumble the given node */
@@ -208,9 +208,9 @@ DoJumble(JumbleState *jstate, Node *node)
 		FlushPendingNulls(jstate);
 
 	/* Process the jumble buffer and produce the hash value */
-	return DatumGetUInt64(hash_any_extended(jstate->jumble,
-											jstate->jumble_len,
-											0));
+	return DatumGetInt64(hash_any_extended(jstate->jumble,
+										   jstate->jumble_len,
+										   0));
 }
 
 /*
@@ -256,10 +256,10 @@ AppendJumbleInternal(JumbleState *jstate, const unsigned char *item,
 
 		if (unlikely(jumble_len >= JUMBLE_SIZE))
 		{
-			uint64		start_hash;
+			int64		start_hash;
 
-			start_hash = DatumGetUInt64(hash_any_extended(jumble,
-														  JUMBLE_SIZE, 0));
+			start_hash = DatumGetInt64(hash_any_extended(jumble,
+														 JUMBLE_SIZE, 0));
 			memcpy(jumble, &start_hash, sizeof(start_hash));
 			jumble_len = sizeof(start_hash);
 		}
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 64d3a09f765..8c90ab54af8 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -68,6 +68,12 @@
 	token = pg_strtok(&length);		/* get field value */ \
 	local_node->fldname = atoui(token)
 
+/* Read a signed integer field (anything written using INT64_FORMAT) */
+#define READ_INT64_FIELD(fldname) \
+	token = pg_strtok(&length); /* skip :fldname */ \
+	token = pg_strtok(&length); /* get field value */ \
+	local_node->fldname = strtoi64(token, NULL, 10)
+
 /* Read an unsigned integer field (anything written using UINT64_FORMAT) */
 #define READ_UINT64_FIELD(fldname) \
 	token = pg_strtok(&length);		/* skip :fldname */ \
diff --git a/src/backend/rewrite/rewriteHandler.c b/src/backend/rewrite/rewriteHandler.c
index f0bce5f9ed9..2ef0e7fbf3a 100644
--- a/src/backend/rewrite/rewriteHandler.c
+++ b/src/backend/rewrite/rewriteHandler.c
@@ -4544,7 +4544,7 @@ build_generation_expression(Relation rel, int attrno)
 List *
 QueryRewrite(Query *parsetree)
 {
-	uint64		input_query_id = parsetree->queryId;
+	int64		input_query_id = parsetree->queryId;
 	List	   *querylist;
 	List	   *results;
 	ListCell   *l;
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index c242c8170b5..4efd8120d2c 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -1682,7 +1682,7 @@ exec_bind_message(StringInfo input_message)
 	{
 		Query	   *query = lfirst_node(Query, lc);
 
-		if (query->queryId != UINT64CONST(0))
+		if (query->queryId != INT64CONST(0))
 		{
 			pgstat_report_query_id(query->queryId, false);
 			break;
@@ -2174,7 +2174,7 @@ exec_execute_message(const char *portal_name, long max_rows)
 	{
 		PlannedStmt *stmt = lfirst_node(PlannedStmt, lc);
 
-		if (stmt->queryId != UINT64CONST(0))
+		if (stmt->queryId != INT64CONST(0))
 		{
 			pgstat_report_query_id(stmt->queryId, false);
 			break;
diff --git a/src/backend/utils/activity/backend_status.c b/src/backend/utils/activity/backend_status.c
index e1576e64b6d..9c2ed2cb9e0 100644
--- a/src/backend/utils/activity/backend_status.c
+++ b/src/backend/utils/activity/backend_status.c
@@ -320,7 +320,7 @@ pgstat_bestart_initial(void)
 	lbeentry.st_state = STATE_STARTING;
 	lbeentry.st_progress_command = PROGRESS_COMMAND_INVALID;
 	lbeentry.st_progress_command_target = InvalidOid;
-	lbeentry.st_query_id = UINT64CONST(0);
+	lbeentry.st_query_id = INT64CONST(0);
 	lbeentry.st_plan_id = UINT64CONST(0);
 
 	/*
@@ -599,7 +599,7 @@ pgstat_report_activity(BackendState state, const char *cmd_str)
 			beentry->st_activity_start_timestamp = 0;
 			/* st_xact_start_timestamp and wait_event_info are also disabled */
 			beentry->st_xact_start_timestamp = 0;
-			beentry->st_query_id = UINT64CONST(0);
+			beentry->st_query_id = INT64CONST(0);
 			beentry->st_plan_id = UINT64CONST(0);
 			proc->wait_event_info = 0;
 			PGSTAT_END_WRITE_ACTIVITY(beentry);
@@ -662,7 +662,7 @@ pgstat_report_activity(BackendState state, const char *cmd_str)
 	 */
 	if (state == STATE_RUNNING)
 	{
-		beentry->st_query_id = UINT64CONST(0);
+		beentry->st_query_id = INT64CONST(0);
 		beentry->st_plan_id = UINT64CONST(0);
 	}
 
@@ -683,7 +683,7 @@ pgstat_report_activity(BackendState state, const char *cmd_str)
  * --------
  */
 void
-pgstat_report_query_id(uint64 query_id, bool force)
+pgstat_report_query_id(int64 query_id, bool force)
 {
 	volatile PgBackendStatus *beentry = MyBEEntry;
 
@@ -702,7 +702,7 @@ pgstat_report_query_id(uint64 query_id, bool force)
 	 * command, so ignore the one provided unless it's an explicit call to
 	 * reset the identifier.
 	 */
-	if (beentry->st_query_id != 0 && !force)
+	if (beentry->st_query_id != INT64CONST(0) && !force)
 		return;
 
 	/*
@@ -1134,7 +1134,7 @@ pgstat_get_crashed_backend_activity(int pid, char *buffer, int buflen)
  *
  * Return current backend's query identifier.
  */
-uint64
+int64
 pgstat_get_my_query_id(void)
 {
 	if (!MyBEEntry)
diff --git a/src/backend/utils/adt/pgstatfuncs.c b/src/backend/utils/adt/pgstatfuncs.c
index 97af7c6554f..e980109f245 100644
--- a/src/backend/utils/adt/pgstatfuncs.c
+++ b/src/backend/utils/adt/pgstatfuncs.c
@@ -640,10 +640,10 @@ pg_stat_get_activity(PG_FUNCTION_ARGS)
 				values[28] = BoolGetDatum(false);	/* GSS credentials not
 													 * delegated */
 			}
-			if (beentry->st_query_id == 0)
+			if (beentry->st_query_id == INT64CONST(0))
 				nulls[30] = true;
 			else
-				values[30] = UInt64GetDatum(beentry->st_query_id);
+				values[30] = Int64GetDatum(beentry->st_query_id);
 		}
 		else
 		{
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h
index 4610fc61293..dd00ab420b8 100644
--- a/src/include/nodes/parsenodes.h
+++ b/src/include/nodes/parsenodes.h
@@ -127,8 +127,13 @@ typedef struct Query
 	 * query identifier (can be set by plugins); ignored for equal, as it
 	 * might not be set; also not stored.  This is the result of the query
 	 * jumble, hence ignored.
+	 *
+	 * We store this as a signed value as this is the form it's displayed to
+	 * users in places such as EXPLAIN and pg_stat_statements.  Primarily this
+	 * is done due to lack of an SQL type to represent the full range of
+	 * uint64.
 	 */
-	uint64		queryId pg_node_attr(equal_ignore, query_jumble_ignore, read_write_ignore, read_as(0));
+	int64		queryId pg_node_attr(equal_ignore, query_jumble_ignore, read_write_ignore, read_as(0));
 
 	/* do I set the command result tag? */
 	bool		canSetTag pg_node_attr(query_jumble_ignore);
diff --git a/src/include/nodes/plannodes.h b/src/include/nodes/plannodes.h
index f0d514e6e15..e70e33afa9c 100644
--- a/src/include/nodes/plannodes.h
+++ b/src/include/nodes/plannodes.h
@@ -53,7 +53,7 @@ typedef struct PlannedStmt
 	CmdType		commandType;
 
 	/* query identifier (copied from Query) */
-	uint64		queryId;
+	int64		queryId;
 
 	/* plan identifier (can be set by plugins) */
 	uint64		planId;
diff --git a/src/include/utils/backend_status.h b/src/include/utils/backend_status.h
index 430ccd7d78e..bbebe517501 100644
--- a/src/include/utils/backend_status.h
+++ b/src/include/utils/backend_status.h
@@ -170,7 +170,7 @@ typedef struct PgBackendStatus
 	int64		st_progress_param[PGSTAT_NUM_PROGRESS_PARAM];
 
 	/* query identifier, optionally computed using post_parse_analyze_hook */
-	uint64		st_query_id;
+	int64		st_query_id;
 
 	/* plan identifier, optionally computed using planner_hook */
 	uint64		st_plan_id;
@@ -321,7 +321,7 @@ extern void pgstat_clear_backend_activity_snapshot(void);
 
 /* Activity reporting functions */
 extern void pgstat_report_activity(BackendState state, const char *cmd_str);
-extern void pgstat_report_query_id(uint64 query_id, bool force);
+extern void pgstat_report_query_id(int64 query_id, bool force);
 extern void pgstat_report_plan_id(uint64 plan_id, bool force);
 extern void pgstat_report_tempfile(size_t filesize);
 extern void pgstat_report_appname(const char *appname);
@@ -329,7 +329,7 @@ extern void pgstat_report_xact_timestamp(TimestampTz tstamp);
 extern const char *pgstat_get_backend_current_activity(int pid, bool checkUser);
 extern const char *pgstat_get_crashed_backend_activity(int pid, char *buffer,
 													   int buflen);
-extern uint64 pgstat_get_my_query_id(void);
+extern int64 pgstat_get_my_query_id(void);
 extern uint64 pgstat_get_my_plan_id(void);
 extern BackendType pgstat_get_backend_type_by_proc_number(ProcNumber procNumber);