On Wed, Mar 1, 2017 at 8:39 PM, Michael Paquier <michael.paqu...@gmail.com>
wrote:
> On Thu, Mar 2, 2017 at 7:20 AM, Jim Mlodgenski <jimm...@gmail.com> wrote:
> >
> >
> > On Sun, Feb 26, 2017 at 11:49 AM, Robert Haas <robertmh...@gmail.com>
> wrote:
> >>
> >> On Wed, Feb 22, 2017 at 11:13 AM, Jim Nasby <jim.na...@bluetreble.com>
> >> wrote:
> >> > Certainly easier, but I don't think it'd be better. Matviews really
> >> > aren't
> >> > the same thing as tables. Off-hand (without reviewing the patch),
> update
> >> > and
> >> > delete counts certainly wouldn't make any sense. "Insert" counts
> might,
> >> > in
> >> > as much as it's how many rows have been added by refreshes. You'd
> want a
> >> > refresh count too.
> >>
> >> Regular REFRESH truncates the view and repopulates it, but REFRESH
> >> CONCURRENTLY does inserts, updates, and deletes as needed to adjust
> >> the contrs that make sense for
> >> regular tables are also sensible here.
> >>
> >
> > After digging into things further, just making refresh report the stats
> for
> > what is it basically doing simplifies and solves it and it is something
> we
> > can back patch if that the consensus. See the attached patch.
>
> This is unhappy:
> $ git diff master --check
> src/backend/commands/matview.c:155: indent with spaces.
> + uint64 processed = 0;
>
> + /*
> + * Send the stats to mimic what we are essentially doing.
> + * A truncate and insert
> + */
> This sentence is unfinished.
>
> There is also no need to report the number of inserts if WITH NO DATA is
> used.
>
Here is the cleaned up patch
diff --git a/src/backend/commands/matview.c b/src/backend/commands/matview.c
index a18c917..94a69dd 100644
--- a/src/backend/commands/matview.c
+++ b/src/backend/commands/matview.c
@@ -30,6 +30,7 @@
#include "executor/spi.h"
#include "miscadmin.h"
#include "parser/parse_relation.h"
+#include "pgstat.h"
#include "rewrite/rewriteHandler.h"
#include "storage/lmgr.h"
#include "storage/smgr.h"
@@ -59,7 +60,7 @@ static void transientrel_startup(DestReceiver *self, int operation, TupleDesc ty
static bool transientrel_receive(TupleTableSlot *slot, DestReceiver *self);
static void transientrel_shutdown(DestReceiver *self);
static void transientrel_destroy(DestReceiver *self);
-static void refresh_matview_datafill(DestReceiver *dest, Query *query,
+static uint64 refresh_matview_datafill(DestReceiver *dest, Query *query,
const char *queryString);
static char *make_temptable_name_n(char *tempname, int n);
@@ -151,6 +152,7 @@ ExecRefreshMatView(RefreshMatViewStmt *stmt, const char *queryString,
Oid save_userid;
int save_sec_context;
int save_nestlevel;
+ uint64 processed = 0;
ObjectAddress address;
/* Determine strength of lock needed. */
@@ -322,7 +324,7 @@ ExecRefreshMatView(RefreshMatViewStmt *stmt, const char *queryString,
/* Generate the data, if wanted. */
if (!stmt->skipData)
- refresh_matview_datafill(dest, dataQuery, queryString);
+ processed = refresh_matview_datafill(dest, dataQuery, queryString);
heap_close(matviewRel, NoLock);
@@ -345,8 +347,18 @@ ExecRefreshMatView(RefreshMatViewStmt *stmt, const char *queryString,
Assert(matview_maintenance_depth == old_depth);
}
else
+ {
refresh_by_heap_swap(matviewOid, OIDNewHeap, relpersistence);
+ /*
+ * Send the stats to mimic what we are essentially doing. Swapping the heap
+ * is equilivant to truncating the relation and inserting the new data.
+ */
+ pgstat_count_truncate(matviewRel);
+ if (!stmt->skipData)
+ pgstat_count_heap_insert(matviewRel, processed);
+ }
+
/* Roll back any GUC changes */
AtEOXact_GUC(false, save_nestlevel);
@@ -361,7 +373,7 @@ ExecRefreshMatView(RefreshMatViewStmt *stmt, const char *queryString,
/*
* refresh_matview_datafill
*/
-static void
+static uint64
refresh_matview_datafill(DestReceiver *dest, Query *query,
const char *queryString)
{
@@ -369,6 +381,7 @@ refresh_matview_datafill(DestReceiver *dest, Query *query,
PlannedStmt *plan;
QueryDesc *queryDesc;
Query *copied_query;
+ uint64 processed;
/* Lock and rewrite, using a copy to preserve the original query. */
copied_query = copyObject(query);
@@ -406,6 +419,8 @@ refresh_matview_datafill(DestReceiver *dest, Query *query,
/* run the plan */
ExecutorRun(queryDesc, ForwardScanDirection, 0L);
+ processed = queryDesc->estate->es_processed;
+
/* and clean up */
ExecutorFinish(queryDesc);
ExecutorEnd(queryDesc);
@@ -413,6 +428,8 @@ refresh_matview_datafill(DestReceiver *dest, Query *query,
FreeQueryDesc(queryDesc);
PopActiveSnapshot();
+
+ return processed;
}
DestReceiver *
--
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