Cherry pick Rows out in EXPLAIN ANALYZE #670

robozmey · 2024-10-15T08:34:50Z

Cherry pick yezzey-gp/ygp@1d41230

Change logs

Add "Rows out" print in cdbexplain_showExecStats

set gp_enable_explain_rows_out=on;

drop table if exists tt; create table tt (a int, b int) distributed randomly;

explain (analyze,verbose) insert into tt select * from generate_series(1,1000)a,generate_series(1,1000)b;

 Insert  (cost=0.00..495560.34 rows=333334 width=8) (actual time=3.829..1148.458 rows=333741 loops=1)
   Output: generate_series_1.generate_series, generate_series.generate_series, "outer".ColRef_0002, generate_series_1.generate_series
   Executor Memory: 1kB  Segments: 3  Max: 1kB (segment 0)
   Rows out: 333333.33 rows avg x 3 workers, 333741 rows max (seg1), 333054 rows min (seg2).
   ->  Redistribute Motion 3:3  (slice1; segments: 3)  (cost=0.00..479935.34 rows=333334 width=12) (actual time=3.707..761.241 rows=333741 loops=1)
         Output: generate_series_1.generate_series, generate_series.generate_series, "outer".ColRef_0002
         Rows out: 333333.33 rows avg x 3 workers, 333741 rows max (seg1), 333054 rows min (seg2).
         ->  Result  (cost=0.00..479922.82 rows=333334 width=12) (actual time=0.226..882.580 rows=1000000 loops=1)
               Output: generate_series_1.generate_series, generate_series.generate_series, 1
               Rows out: 333333.33 rows avg x 3 workers, 1000000 rows max (seg1), 0 rows min (seg0).
               ->  Result  (cost=0.00..479918.82 rows=333334 width=8) (actual time=0.225..631.202 rows=1000000 loops=1)
                     Output: generate_series_1.generate_series, generate_series.generate_series
                     One-Time Filter: (gp_execution_segment() = 1)
                     Rows out: 333333.33 rows avg x 3 workers, 1000000 rows max (seg1), 0 rows min (seg0).
                     ->  Nested Loop  (cost=0.00..479898.05 rows=333334 width=8) (actual time=0.220..386.554 rows=1000000 loops=1)
                           Output: generate_series_1.generate_series, generate_series.generate_series
                           Join Filter: true
                           Rows out: 333333.33 rows avg x 3 workers, 1000000 rows max (seg1), 0 rows min (seg0).
                           ->  Function Scan on pg_catalog.generate_series generate_series_1  (cost=0.00..0.00 rows=334 width=4) (actual time=0.102..0.333 rows=1000 loops=1)
                                 Output: generate_series_1.generate_series
                                 Function Call: generate_series(1, 1000)
                                 work_mem: 40kB  Segments: 1  Max: 40kB (segment 1)
                                 Rows out: 333.33 rows avg x 3 workers, 1000 rows max (seg1), 0 rows min (seg0).
                           ->  Function Scan on pg_catalog.generate_series  (cost=0.00..0.00 rows=334 width=4) (actual time=0.000..0.092 rows=999 loops=1001)
                                 Output: generate_series.generate_series
                                 Function Call: generate_series(1, 1000)
                                 work_mem: 40kB  Segments: 1  Max: 40kB (segment 1)
                                 Rows out: 333333.67 rows avg x 3 workers, 1000001 rows max (seg1), 0 rows min (seg0).
 Planning time: 5.981 ms
   (slice0)    Executor memory: 87K bytes avg x 3 workers, 87K bytes max (seg0).
   (slice1)    Executor memory: 97K bytes avg x 3 workers, 172K bytes max (seg1).  Work_mem: 40K bytes max.
 Memory used:  128000kB
 Optimizer: Pivotal Optimizer (GPORCA)
 Execution time: 1180.349 ms
(34 rows)

explain (analyze,verbose,format text) select * from tt where a > b;

                                                          QUERY PLAN                                                           
-------------------------------------------------------------------------------------------------------------------------------
 Gather Motion 3:1  (slice1; segments: 3)  (cost=0.00..431.00 rows=1 width=8) (actual time=2.534..223.679 rows=499500 loops=1)
   Output: a, b
   ->  Seq Scan on public.tt  (cost=0.00..431.00 rows=1 width=8) (actual time=0.145..127.350 rows=166742 loops=1)
         Output: a, b
         Filter: (tt.a > tt.b)
         Rows out: 166500.00 rows avg x 3 workers, 166742 rows max (seg0), 166340 rows min (seg2).
 Planning time: 2.578 ms
   (slice0)    Executor memory: 183K bytes.
   (slice1)    Executor memory: 43K bytes avg x 3 workers, 43K bytes max (seg0).
 Memory used:  128000kB
 Optimizer: Pivotal Optimizer (GPORCA)
 Execution time: 245.018 ms
(12 rows)

Why are the changes needed?

"Rows out" is useful for auto explain

Does this PR introduce any user-facing change?

If yes, please clarify the previous behavior and the change this PR proposes.

How was this patch tested?

This feature tests in regression gp_explain test

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* Add "Rows out" print in cdbexplain_showExecStats set gp_enable_explain_rows_out=on; explain (analyze,verbose,format text) select * from tt where a > b; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------- Gather Motion 3:1 (slice1; segments: 3) (cost=0.00..431.00 rows=1 width=8) (actual time=2.534..223.679 rows=499500 loops=1) Output: a, b -> Seq Scan on public.tt (cost=0.00..431.00 rows=1 width=8) (actual time=0.145..127.350 rows=166742 loops=1) Output: a, b Filter: (tt.a > tt.b) Rows out: 166500.00 rows avg x 3 workers, 166742 rows max (seg0), 166340 rows min (seg2). ...

CLAassistant · 2024-10-15T08:35:04Z

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Hiiii, @robozmey welcome!🎊 Thanks for taking the effort to make our project better! 🙌 Keep making such awesome contributions!

src/backend/utils/misc/guc_gp.c

fanfuxiaoran · 2024-10-16T06:30:09Z

src/backend/cdb/cdbvars.c

@@ -277,6 +277,7 @@ int			gp_hashagg_groups_per_bucket = 5;
 int			gp_motion_slice_noop = 0;

 /* Cloudberry Database Experimental Feature GUCs */
+bool		gp_enable_explain_rows_out = false;


It is better to send a param to explain command than using a guc to control if print out the "rows out"

Rows out feature created for auto_explain. If we add "rows out" as parameter of explain, then we'll need change auto_explain source, and auto_explain wont be compatible with vanilla

auto_explain wont be compatible with vanilla

Hmm... cannot understand. Could you give more details? Is auto_explain aslo included in vanilla?

auto_explain is included in vanilla https://github.com/greenplum-db/gpdb-archive/tree/main/contrib/auto_explain

Also GUC gp_enable_explain_rows_out is made by analogy with GUC gp_enable_explain_allstat

src/include/cdb/cdbvars.h

src/backend/commands/explain_gp.c

avamingli

Do we have a Parallel Plan test(ex: cbdb_parallel.sql) to ensure the output is as expected?

avamingli · 2024-11-07T12:26:23Z

src/backend/commands/explain_gp.c

+                                 ntuples_imin);
+        }
+        else {
+            // ExplainOpenGroup("Rows Out", NULL, false, es);


Please remove unused codes

github-actions bot reviewed Oct 15, 2024

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robozmey changed the title ~~Rows out в EXPLAIN ANALYZE~~ Rows out in EXPLAIN ANALYZE Oct 15, 2024

robozmey changed the title ~~Rows out in EXPLAIN ANALYZE~~ Cherry pick Rows out in EXPLAIN ANALYZE Oct 15, 2024

my-ship-it requested a review from gongxun0928 October 15, 2024 08:48

reshke reviewed Oct 15, 2024

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src/backend/utils/misc/guc_gp.c Outdated Show resolved Hide resolved

Fix GUC description

e1320a9

fanfuxiaoran reviewed Oct 16, 2024

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robozmey added 4 commits October 24, 2024 14:57

Merge branch 'main' into rows-out

87928a5

Use CdbExplain_NodeSummary to get max and avg

ecca72c

Add min to CdbExplain_Agg

cbff7f0

Add min to CdbExplain_DepStatAcc

c0448fe

fanfuxiaoran reviewed Oct 25, 2024

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src/backend/commands/explain_gp.c Outdated Show resolved Hide resolved

robozmey added 3 commits October 25, 2024 14:05

Remove rshmin, rsimin, nsimin from CdbExplain_DepStatAcc

490521e

Change GUC gp_enable_explain_rows_out description

0b7ab04

Merge branch 'main' into rows-out

e617d39

fanfuxiaoran approved these changes Nov 4, 2024

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my-ship-it approved these changes Nov 5, 2024

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avamingli reviewed Nov 7, 2024

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Remove unused code

d6aa761

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Cherry pick Rows out in EXPLAIN ANALYZE #670

Cherry pick Rows out in EXPLAIN ANALYZE #670

robozmey commented Oct 15, 2024 •

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Cherry pick Rows out in EXPLAIN ANALYZE #670

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Cherry pick Rows out in EXPLAIN ANALYZE #670

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robozmey commented Oct 15, 2024 • edited Loading

Change logs

Why are the changes needed?

Does this PR introduce any user-facing change?

How was this patch tested?

Contributor's Checklist

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