Fix typo: pg_statistics -> pg_statistic

doc/src/sgml/planstats.sgml

@@ -94,7 +94,7 @@ EXPLAIN SELECT * FROM tenk1 WHERE unique1 < 1000;
    and the entry in this case is <function>scalarltsel</function>.
    The <function>scalarltsel</function> function retrieves the histogram for
    <structfield>unique1</structfield> from
-   <structname>pg_statistics</structname>.  For manual queries it is more
+   <structname>pg_statistic</structname>.  For manual queries it is more
    convenient to look in the simpler <structname>pg_stats</structname>
    view:
 

doc/src/sgml/release-7.4.sgml

@@ -2614,7 +2614,7 @@ UPDATE pg_database SET datallowconn = false WHERE datname = 'template0';
 </para>
 
 <itemizedlist>
-<listitem><para>Fix <structname>pg_statistics</> alignment bug that could crash optimizer</para>
+<listitem><para>Fix <structname>pg_statistic</> alignment bug that could crash optimizer</para>
 <para>See above for details about this problem.</para></listitem>
 <listitem><para>Allow non-super users to update <structname>pg_settings</></para></listitem>
 <listitem><para>Fix several optimizer bugs, most of which led to

doc/src/sgml/release-old.sgml

@@ -1650,7 +1650,7 @@ operations on bytea columns (Joe)</para></listitem>
 <listitem><para>Add variable db_user_namespace for database-local user names (Bruce)</para></listitem>
 <listitem><para>SSL improvements (Bear Giles)</para></listitem>
 <listitem><para>Make encryption of stored passwords the default (Bruce)</para></listitem>
-<listitem><para>Allow pg_statistics to be reset by calling pg_stat_reset() (Christopher)</para></listitem>
+<listitem><para>Allow pg_statistic to be reset by calling pg_stat_reset() (Christopher)</para></listitem>
 <listitem><para>Add log_duration parameter (Bruce)</para></listitem>
 <listitem><para>Rename debug_print_query to log_statement (Bruce)</para></listitem>
 <listitem><para>Rename show_query_stats to show_statement_stats (Bruce)</para></listitem>
@@ -3893,7 +3893,7 @@ Faster sorting by calling fewer functions (Tom)
 Create system indexes to match all system caches (Bruce, Hiroshi)
 Make system caches use system indexes (Bruce)
 Make all system indexes unique (Bruce)
-Improve pg_statistics management for VACUUM speed improvement (Tom)
+Improve pg_statistic management for VACUUM speed improvement (Tom)
 Flush backend cache less frequently (Tom, Hiroshi)
 COPY now reuses previous memory allocation, improving performance (Tom)
 Improve optimization cost estimation (Tom)

src/backend/postmaster/autovacuum.c

@@ -2876,7 +2876,7 @@ relation_needs_vacanalyze(Oid relid,
 		*doanalyze = false;
 	}
 
-	/* ANALYZE refuses to work with pg_statistics */
+	/* ANALYZE refuses to work with pg_statistic */
 	if (relid == StatisticRelationId)
 		*doanalyze = false;
 }

src/backend/utils/cache/lsyscache.c

@@ -2832,7 +2832,7 @@ get_attavgwidth(Oid relid, AttrNumber attnum)
  * that have been provided by a stats hook and didn't really come from
  * pg_statistic.
  *
- * statstuple: pg_statistics tuple to be examined.
+ * statstuple: pg_statistic tuple to be examined.
  * atttype: type OID of attribute (can be InvalidOid if values == NULL).
  * atttypmod: typmod of attribute (can be 0 if values == NULL).
  * reqkind: STAKIND code for desired statistics slot kind.