Show table persistence in psql's \dt+ and related commands.

In verbose mode, listTables() now emits a "Persistence" column
showing whether the table/index/view/etc is permanent, temporary,
or unlogged.

David Fetter, reviewed by Fabien Coelho and Rafia Sabih

Discussion: https://postgr.es/m/20190423005642.GZ28936@fetter.org

diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index 1c770b4347a1dc901d41f887473f25347243de4b..0e0af5f942c5d5797365afbfe47b301a4594f6fb 100644 (file)
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -3632,7 +3632,8 @@ listTables(const char *tabtypes, const char *pattern, bool verbose, bool showSys
    PQExpBufferData buf;
    PGresult   *res;
    printQueryOpt myopt = pset.popt;
-   static const bool translate_columns[] = {false, false, true, false, false, false, false};
+   int         cols_so_far;
+   bool        translate_columns[] = {false, false, true, false, false, false, false, false};
 
    /* If tabtypes is empty, we default to \dtvmsE (but see also command.c) */
    if (!(showTables || showIndexes || showViews || showMatViews || showSeq || showForeign))
@@ -3672,14 +3673,39 @@ listTables(const char *tabtypes, const char *pattern, bool verbose, bool showSys
                      gettext_noop("partitioned index"),
                      gettext_noop("Type"),
                      gettext_noop("Owner"));
+   cols_so_far = 4;
 
    if (showIndexes)
+   {
        appendPQExpBuffer(&buf,
-                         ",\n c2.relname as \"%s\"",
+                         ",\n  c2.relname as \"%s\"",
                          gettext_noop("Table"));
+       cols_so_far++;
+   }
 
    if (verbose)
    {
+       /*
+        * Show whether a relation is permanent, temporary, or unlogged.  Like
+        * describeOneTableDetails(), we consider that persistence emerged in
+        * v9.1, even though related concepts existed before.
+        */
+       if (pset.sversion >= 90100)
+       {
+           appendPQExpBuffer(&buf,
+                             ",\n  CASE c.relpersistence WHEN 'p' THEN '%s' WHEN 't' THEN '%s' WHEN 'u' THEN '%s' END as \"%s\"",
+                             gettext_noop("permanent"),
+                             gettext_noop("temporary"),
+                             gettext_noop("unlogged"),
+                             gettext_noop("Persistence"));
+           translate_columns[cols_so_far] = true;
+       }
+
+       /*
+        * We don't bother to count cols_so_far below here, as there's no need
+        * to; this might change with future additions to the output columns.
+        */
+
        /*
         * As of PostgreSQL 9.0, use pg_table_size() to show a more accurate
         * size of a table, including FSM, VM and TOAST tables.