In pg_dump, don't dump a stats object unless dumping underlying table.

If the underlying table isn't being dumped, it's useless to dump
an extended statistics object; it'll just cause errors at restore.
We have always applied similar policies to, say, indexes.

(When and if we get cross-table stats objects, it might be profitable
to think a little harder about what to do with them.  But for now
there seems no point in considering a stats object as anything but
an appendage of its table.)

Rian McGuire and Tom Lane, per report from Rian McGuire.
Back-patch to supported branches.

Discussion: https://postgr.es/m/7075d3aa-3f05-44a5-b68f-47dc6a8a0550@buildkite.com

diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index c27adefbada57232d40496755d1ed003a60cf756..f8ec6130b13454947d3ecdd5a73e915cef58e9c5 100644 (file)
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -1957,6 +1957,26 @@ selectDumpablePublicationTable(DumpableObject *dobj, Archive *fout)
                DUMP_COMPONENT_ALL : DUMP_COMPONENT_NONE;
 }
 
+/*
+ * selectDumpableStatisticsObject: policy-setting subroutine
+ *             Mark an extended statistics object as to be dumped or not
+ *
+ * We dump an extended statistics object if the schema it's in and the table
+ * it's for are being dumped.  (This'll need more thought if statistics
+ * objects ever support cross-table stats.)
+ */
+static void
+selectDumpableStatisticsObject(StatsExtInfo *sobj, Archive *fout)
+{
+       if (checkExtensionMembership(&sobj->dobj, fout))
+               return;                                 /* extension membership overrides all else */
+
+       sobj->dobj.dump = sobj->dobj.namespace->dobj.dump_contains;
+       if (sobj->stattable == NULL ||
+               !(sobj->stattable->dobj.dump & DUMP_COMPONENT_DEFINITION))
+               sobj->dobj.dump = DUMP_COMPONENT_NONE;
+}
+
 /*
  * selectDumpableObject: policy-setting subroutine
  *             Mark a generic dumpable object as to be dumped or not
@@ -7683,6 +7703,7 @@ getExtendedStatistics(Archive *fout)
        int                     i_stxname;
        int                     i_stxnamespace;
        int                     i_rolname;
+       int                     i_stxrelid;
        int                     i_stattarget;
        int                     i;
 
@@ -7694,12 +7715,12 @@ getExtendedStatistics(Archive *fout)
 
        if (fout->remoteVersion < 130000)
                appendPQExpBuffer(query, "SELECT tableoid, oid, stxname, "
-                                                 "stxnamespace, (%s stxowner) AS rolname, (-1) AS stxstattarget "
+                                                 "stxnamespace, (%s stxowner) AS rolname, stxrelid, (-1) AS stxstattarget "
                                                  "FROM pg_catalog.pg_statistic_ext",
                                                  username_subquery);
        else
                appendPQExpBuffer(query, "SELECT tableoid, oid, stxname, "
-                                                 "stxnamespace, (%s stxowner) AS rolname, stxstattarget "
+                                                 "stxnamespace, (%s stxowner) AS rolname, stxrelid, stxstattarget "
                                                  "FROM pg_catalog.pg_statistic_ext",
                                                  username_subquery);
 
@@ -7712,6 +7733,7 @@ getExtendedStatistics(Archive *fout)
        i_stxname = PQfnumber(res, "stxname");
        i_stxnamespace = PQfnumber(res, "stxnamespace");
        i_rolname = PQfnumber(res, "rolname");
+       i_stxrelid = PQfnumber(res, "stxrelid");
        i_stattarget = PQfnumber(res, "stxstattarget");
 
        statsextinfo = (StatsExtInfo *) pg_malloc(ntups * sizeof(StatsExtInfo));
@@ -7726,10 +7748,12 @@ getExtendedStatistics(Archive *fout)
                statsextinfo[i].dobj.namespace =
                        findNamespace(atooid(PQgetvalue(res, i, i_stxnamespace)));
                statsextinfo[i].rolname = pg_strdup(PQgetvalue(res, i, i_rolname));
+               statsextinfo[i].stattable =
+                       findTableByOid(atooid(PQgetvalue(res, i, i_stxrelid)));
                statsextinfo[i].stattarget = atoi(PQgetvalue(res, i, i_stattarget));
 
                /* Decide whether we want to dump it */
-               selectDumpableObject(&(statsextinfo[i].dobj), fout);
+               selectDumpableStatisticsObject(&(statsextinfo[i]), fout);
 
                /* Stats objects do not currently have ACLs. */
                statsextinfo[i].dobj.dump &= ~DUMP_COMPONENT_ACL;

diff --git a/src/bin/pg_dump/pg_dump.h b/src/bin/pg_dump/pg_dump.h
index 986782584ace44262b3550955cc2db1908c94991..832aa86eba1a0928f04605911638f27fb6971b52 100644 (file)
--- a/src/bin/pg_dump/pg_dump.h
+++ b/src/bin/pg_dump/pg_dump.h
@@ -398,6 +398,7 @@ typedef struct _statsExtInfo
 {
        DumpableObject dobj;
        char       *rolname;            /* name of owner, or empty string */
+       TableInfo  *stattable;          /* link to table the stats are for */
        int                     stattarget;             /* statistics target */
 } StatsExtInfo;
 

diff --git a/src/bin/pg_dump/t/002_pg_dump.pl b/src/bin/pg_dump/t/002_pg_dump.pl
index 4402ba7fe530210d8c6bef8852d5e60624336827..da7578709e530d3bd7fe7f19ea3bb564ca8a3149 100644 (file)
--- a/src/bin/pg_dump/t/002_pg_dump.pl
+++ b/src/bin/pg_dump/t/002_pg_dump.pl
@@ -2855,13 +2855,13 @@ my %tests = (
        'CREATE STATISTICS extended_stats_no_options' => {
                create_order => 97,
                create_sql   => 'CREATE STATISTICS dump_test.test_ext_stats_no_options
-                                                       ON col1, col2 FROM dump_test.test_fifth_table',
+                                                       ON col1, col2 FROM dump_test.test_table',
                regexp => qr/^
-                       \QCREATE STATISTICS dump_test.test_ext_stats_no_options ON col1, col2 FROM dump_test.test_fifth_table;\E
+                       \QCREATE STATISTICS dump_test.test_ext_stats_no_options ON col1, col2 FROM dump_test.test_table;\E
                    /xms,
                like =>
                  { %full_runs, %dump_test_schema_runs, section_post_data => 1, },
-               unlike => { exclude_dump_test_schema => 1, },
+               unlike => { exclude_dump_test_schema => 1, exclude_test_table => 1, },
        },
 
        'CREATE STATISTICS extended_stats_options' => {