!1616 修复gs_dump备份后序列值递增问题

Merge pull request !1616 from 薛蒙恩/gsdump_sequence

src/bin/pg_dump/pg_dump.cpp

@@ -20836,6 +20836,7 @@ static void dumpSequenceData(Archive* fout, TableDataInfo* tdinfo, bool large)
     called = (strcmp(PQgetvalue(res, 0, 4), "t") == 0);
 
 #ifdef PGXC
+#ifdef ENABLE_MULTIPLE_NODES
     /*
      * In Postgres-XC it is possible that the current value of a
      * sequence cached on each node is different as several sessions
@@ -20897,6 +20898,28 @@ static void dumpSequenceData(Archive* fout, TableDataInfo* tdinfo, bool large)
 
     ExecuteSqlStatement(fout, "ROLLBACK TO SAVEPOINT bfnextval");
     ExecuteSqlStatement(fout, "RELEASE bfnextval");
+#else
+    resetPQExpBuffer(query);
+    PQclear(res);
+    appendPQExpBuffer(query, "SELECT last_value, is_called FROM %s;", fmtId(tbinfo->dobj.name));
+    res = ExecuteSqlQuery(fout, query->data, PGRES_TUPLES_OK);
+
+    if (PQntuples(res) != 1) {
+        write_msg(NULL,
+            ngettext("query to get nextval of sequence %s "
+                    "returned %d rows (expected 1)\n",
+                    "query to get nextval of sequence %s "
+                    "returned %d rows (expected 1)\n",
+                    PQntuples(res)),
+                    fmtId(tbinfo->dobj.name),
+                    PQntuples(res));
+        PQclear(res);
+        destroyPQExpBuffer(query);
+        exit_nicely(1);
+    }
+    last = PQgetvalue(res, 0, 0);
+#endif
+
 #endif
 
     resetPQExpBuffer(query);

src/test/regress/input/gs_dump.source

@@ -54,5 +54,6 @@ ALTER TABLE rlsrel1 FORCE ROW LEVEL SECURITY;
 ALTER TABLE rlsrel2 ENABLE ROW LEVEL SECURITY;
 \! @abs_bindir@/gs_dump --help > @abs_bindir@/gs_dump.log 2>&1
 \! @abs_bindir@/gs_dump basedb -p @portstring@ --with-encryption=AES128 --with-key=abcdefghigklmnop --include-alter-table -n dumptest -s > @abs_bindir@/dump.sql 2>&1 ; echo $?
+SELECT * FROM dumptest."seq$";
 \c regression
 drop database if exists basedb;

src/test/regress/output/gs_dump.source

@@ -57,5 +57,11 @@ ALTER TABLE rlsrel2 ENABLE ROW LEVEL SECURITY;
 \! @abs_bindir@/gs_dump --help > @abs_bindir@/gs_dump.log 2>&1
 \! @abs_bindir@/gs_dump basedb -p @portstring@ --with-encryption=AES128 --with-key=abcdefghigklmnop --include-alter-table -n dumptest -s > @abs_bindir@/dump.sql 2>&1 ; echo $?
 0
+SELECT * FROM dumptest."seq$";
+  sequence_name | last_value | start_value | increment_by |      max_value      | min_value | cache_value | log_cnt | is_cycled | is_called | uuid
+ ---------------+------------+-------------+--------------+---------------------+-----------+-------------+---------+-----------+-----------+------
+  seq$          |        101 |         101 |            1 | 9223372036854775807 |         1 |           1 |       0 | f         | f         |    0
+ (1 row)
+
 \c regression
 drop database if exists basedb;