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Commitc2c537c

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Temporarily instrument postgres_fdw test to look for statistics changes.
It seems fairly hard to explain recent buildfarm failures without thetheory that something is doing an ANALYZE behind our backs. Probefor this directly to see if it's true.In principle the outputs of these queries should be stable, since the tablein question is small enough that ANALYZE's sample will include all rows.But even if that turns out to be wrong, we can put up with some failuresfor a bit. I don't intend to leave this here indefinitely.Discussion:https://postgr.es/m/25502.1520277552@sss.pgh.pa.us
1 parent722408b commitc2c537c

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‎contrib/postgres_fdw/expected/postgres_fdw.out

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Original file line numberDiff line numberDiff line change
@@ -87,6 +87,23 @@ ANALYZE "S 1"."T 1";
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ANALYZE "S 1"."T 2";
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ANALYZE "S 1"."T 3";
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ANALYZE "S 1"."T 4";
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-- record relpages for T 1
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create temp table save_t_1_relpages as
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select relpages as old_relpages from pg_class where relname = 'T 1';
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select relpages - (select old_relpages from save_t_1_relpages) as pg_delta,
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reltuples from pg_class where relname = 'T 1';
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pg_delta | reltuples
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----------+-----------
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0 | 1000
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(1 row)
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select (histogram_bounds::text::int[])[array_length(histogram_bounds,1)]
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from pg_stats where tablename = 'T 1' and attname = 'C 1';
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histogram_bounds
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------------------
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1000
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(1 row)
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-- ===================================================================
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-- create foreign tables
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-- ===================================================================
@@ -5520,6 +5537,20 @@ UPDATE ft2 SET c3 = 'bar' WHERE postgres_fdw_abs(c1) > 2000 RETURNING *;
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2010 | 0 | bar | | | | ft2 |
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(10 rows)
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select relpages - (select old_relpages from save_t_1_relpages) as pg_delta,
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reltuples from pg_class where relname = 'T 1';
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pg_delta | reltuples
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----------+-----------
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0 | 1000
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(1 row)
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select (histogram_bounds::text::int[])[array_length(histogram_bounds,1)]
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from pg_stats where tablename = 'T 1' and attname = 'C 1';
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histogram_bounds
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------------------
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1000
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(1 row)
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EXPLAIN (verbose, costs off)
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UPDATE ft2 SET c3 = 'baz'
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FROM ft4 INNER JOIN ft5 ON (ft4.c1 = ft5.c1)

‎contrib/postgres_fdw/sql/postgres_fdw.sql

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -95,6 +95,15 @@ ANALYZE "S 1"."T 2";
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ANALYZE"S 1"."T 3";
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ANALYZE"S 1"."T 4";
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-- record relpages for T 1
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create temp table save_t_1_relpagesas
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select relpagesas old_relpagesfrom pg_classwhere relname='T 1';
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select relpages- (select old_relpagesfrom save_t_1_relpages)as pg_delta,
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reltuplesfrom pg_classwhere relname='T 1';
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select (histogram_bounds::text::int[])[array_length(histogram_bounds,1)]
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from pg_statswhere tablename='T 1'and attname='C 1';
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-- ===================================================================
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-- create foreign tables
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-- ===================================================================
@@ -1139,6 +1148,10 @@ INSERT INTO ft2 (c1,c2,c3)
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EXPLAIN (verbose, costs off)
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UPDATE ft2SET c3='bar'WHERE postgres_fdw_abs(c1)>2000 RETURNING*;-- can't be pushed down
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UPDATE ft2SET c3='bar'WHERE postgres_fdw_abs(c1)>2000 RETURNING*;
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select relpages- (select old_relpagesfrom save_t_1_relpages)as pg_delta,
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reltuplesfrom pg_classwhere relname='T 1';
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select (histogram_bounds::text::int[])[array_length(histogram_bounds,1)]
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from pg_statswhere tablename='T 1'and attname='C 1';
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EXPLAIN (verbose, costs off)
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UPDATE ft2SET c3='baz'
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FROM ft4INNER JOIN ft5ON (ft4.c1=ft5.c1)

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