This file is indexed.

/usr/share/postgresql/9.6/extension/powa--2.0.1.sql is in postgresql-9.6-powa 3.1.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
--\echo Use "CREATE EXTENSION powa" to load this file. \quit

SET statement_timeout = 0;
SET client_encoding = 'UTF8';
SET standard_conforming_strings = on;
SET check_function_bodies = false;
SET client_min_messages = warning;
SET escape_string_warning = off;
SET search_path = public, pg_catalog;

CREATE TYPE powa_statement_history_record AS (
    ts timestamp with time zone,
    calls bigint,
    total_time double precision,
    rows bigint,
    shared_blks_hit bigint,
    shared_blks_read bigint,
    shared_blks_dirtied bigint,
    shared_blks_written bigint,
    local_blks_hit bigint,
    local_blks_read bigint,
    local_blks_dirtied bigint,
    local_blks_written bigint,
    temp_blks_read bigint,
    temp_blks_written bigint,
    blk_read_time double precision,
    blk_write_time double precision
);

CREATE TABLE powa_last_aggregation (
    aggts timestamp with time zone
);

INSERT INTO powa_last_aggregation(aggts) VALUES (current_timestamp);

CREATE TABLE powa_last_purge (
    purgets timestamp with time zone
);

INSERT INTO powa_last_purge (purgets) VALUES (current_timestamp);

CREATE TABLE powa_statements (
    queryid bigint NOT NULL,
    dbid oid NOT NULL,
    userid oid NOT NULL,
    query text NOT NULL
);

ALTER TABLE ONLY powa_statements
    ADD CONSTRAINT powa_statements_pkey PRIMARY KEY (queryid, dbid, userid);

CREATE INDEX powa_statements_dbid_idx ON powa_statements(dbid);
CREATE INDEX powa_statements_userid_idx ON powa_statements(userid);


CREATE TABLE powa_statements_history (
    queryid bigint NOT NULL,
    dbid oid NOT NULL,
    userid oid NOT NULL,
    coalesce_range tstzrange NOT NULL,
    records powa_statement_history_record[] NOT NULL
);

CREATE INDEX powa_statements_history_query_ts ON powa_statements_history USING gist (queryid, coalesce_range);

CREATE TABLE powa_statements_history_db (
    dbid oid NOT NULL,
    coalesce_range tstzrange NOT NULL,
    records powa_statement_history_record[] NOT NULL
);

CREATE INDEX powa_statements_history_db_ts ON powa_statements_history_db USING gist (dbid, coalesce_range);

CREATE TABLE powa_statements_history_current (
    queryid bigint NOT NULL,
    dbid oid NOT NULL,
    userid oid NOT NULL,
    record powa_statement_history_record NOT NULL
);

CREATE TABLE powa_statements_history_current_db (
    dbid oid NOT NULL,
    record powa_statement_history_record NOT NULL
);

CREATE SEQUENCE powa_coalesce_sequence INCREMENT BY 1
  START WITH 1
  CYCLE;


CREATE TABLE powa_functions (
    module text NOT NULL,
    operation text NOT NULL,
    function_name text NOT NULL,
    added_manually boolean NOT NULL default true,
    CHECK (operation IN ('snapshot','aggregate','purge','unregister'))
);

INSERT INTO powa_functions (module, operation, function_name, added_manually) VALUES
    ('pg_stat_statements', 'snapshot', 'powa_statements_snapshot', false),
    ('pg_stat_statements', 'aggregate','powa_statements_aggregate', false),
    ('pg_stat_statements', 'purge', 'powa_statements_purge', false);

/* pg_stat_kcache integration - part 1 */

CREATE TYPE public.kcache_type AS (
    ts timestamptz,
    reads bigint,
    writes bigint,
    user_time double precision,
    system_time double precision
);

CREATE TABLE public.powa_kcache_metrics (
    coalesce_range tstzrange NOT NULL,
    queryid bigint NOT NULL,
    dbid oid NOT NULL,
    userid oid NOT NULL,
    metrics public.kcache_type[] NOT NULL,
    PRIMARY KEY (coalesce_range, queryid, dbid, userid)
);

CREATE INDEX ON public.powa_kcache_metrics (queryid);

CREATE TABLE public.powa_kcache_metrics_db (
    coalesce_range tstzrange NOT NULL,
    dbid oid NOT NULL,
    metrics public.kcache_type[] NOT NULL,
    PRIMARY KEY (coalesce_range, dbid)
);

CREATE TABLE public.powa_kcache_metrics_current (
    queryid bigint NOT NULL,
    dbid oid NOT NULL,
    userid oid NOT NULL,
    metrics kcache_type NULL NULL
);

CREATE TABLE public.powa_kcache_metrics_current_db (
    dbid oid NOT NULL,
    metrics kcache_type NULL NULL
);

/* end of pg_stat_kcache integration - part 1 */

/* pg_qualstats integration - part 1 */
CREATE TYPE public.qual_type AS (
    relid oid,
    attnum integer,
    opno oid,
    eval_type "char"
);

CREATE TYPE public.qual_values AS (
    constants text[],
    count bigint,
    nbfiltered bigint
);

CREATE TYPE powa_qualstats_history_item AS (
  ts timestamptz,
  count bigint,
  nbfiltered bigint
);

CREATE TABLE public.powa_qualstats_quals (
    qualid bigint,
    queryid bigint,
    dbid oid,
    userid oid,
    quals public.qual_type[],
    PRIMARY KEY (qualid, queryid, dbid, userid),
    FOREIGN KEY (queryid, dbid, userid) REFERENCES powa_statements(queryid, dbid, userid)
      MATCH FULL ON UPDATE CASCADE ON DELETE CASCADE
);

CREATE TABLE public.powa_qualstats_quals_history (
    qualid bigint,
    queryid bigint,
    dbid oid,
    userid oid,
    coalesce_range tstzrange,
    records powa_qualstats_history_item[],
    FOREIGN KEY (qualid, queryid, dbid, userid) REFERENCES public.powa_qualstats_quals (qualid, queryid, dbid, userid) MATCH FULL ON UPDATE CASCADE ON DELETE CASCADE
);

CREATE TABLE public.powa_qualstats_quals_history_current (
    qualid bigint,
    queryid bigint,
    dbid oid,
    userid oid,
    ts timestamptz,
    count   bigint,
    nbfiltered bigint,
    FOREIGN KEY (qualid, queryid, dbid, userid) REFERENCES powa_qualstats_quals(qualid, queryid, dbid, userid)
      MATCH FULL ON UPDATE CASCADE ON DELETE CASCADE
);

CREATE TABLE public.powa_qualstats_constvalues_history (
    qualid bigint,
    queryid bigint,
    dbid oid,
    userid oid,
    coalesce_range tstzrange,
    most_filtering qual_values[],
    least_filtering qual_values[],
    most_executed qual_values[],
    FOREIGN KEY (qualid, queryid, dbid, userid) REFERENCES public.powa_qualstats_quals (qualid, queryid, dbid, userid) MATCH FULL ON UPDATE CASCADE ON DELETE CASCADE
);

CREATE TABLE public.powa_qualstats_constvalues_history_current (
    qualid bigint,
    queryid bigint,
    dbid oid,
    userid oid,
    ts timestamptz,
    constvalues text[],
    count bigint,
    nbfiltered bigint,
    FOREIGN KEY (qualid, queryid, dbid, userid) REFERENCES public.powa_qualstats_quals (qualid, queryid, dbid, userid) MATCH FULL ON UPDATE CASCADE ON DELETE CASCADE
);

CREATE INDEX ON powa_qualstats_constvalues_history USING gist (queryid, qualid, coalesce_range);
CREATE INDEX ON powa_qualstats_constvalues_history (qualid, queryid);
CREATE INDEX ON powa_qualstats_quals(queryid);


/* end of pg_qualstats_integration - part 1 */

-- Mark all of powa's tables as "to be dumped"
SELECT pg_catalog.pg_extension_config_dump('powa_statements','');
SELECT pg_catalog.pg_extension_config_dump('powa_statements_history','');
SELECT pg_catalog.pg_extension_config_dump('powa_statements_history_db','');
SELECT pg_catalog.pg_extension_config_dump('powa_statements_history_current','');
SELECT pg_catalog.pg_extension_config_dump('powa_statements_history_current_db','');
SELECT pg_catalog.pg_extension_config_dump('powa_functions','WHERE added_manually');
SELECT pg_catalog.pg_extension_config_dump('powa_kcache_metrics','');
SELECT pg_catalog.pg_extension_config_dump('powa_kcache_metrics_db','');
SELECT pg_catalog.pg_extension_config_dump('powa_kcache_metrics_current','');
SELECT pg_catalog.pg_extension_config_dump('powa_kcache_metrics_current_db','');
SELECT pg_catalog.pg_extension_config_dump('powa_qualstats_quals','');
SELECT pg_catalog.pg_extension_config_dump('powa_qualstats_quals_history','');
SELECT pg_catalog.pg_extension_config_dump('powa_qualstats_quals_history_current','');
SELECT pg_catalog.pg_extension_config_dump('powa_qualstats_constvalues_history','');
SELECT pg_catalog.pg_extension_config_dump('powa_qualstats_constvalues_history_current','');

CREATE OR REPLACE FUNCTION public.powa_check_created_extensions()
RETURNS event_trigger
LANGUAGE plpgsql
AS $_$
DECLARE
BEGIN
    /* We have for now no way for a proper handling of this event,
     * as we don't have a table with the list of supported extensions.
     * So just call every powa_*_register() function we know each time an
     * extension is created. Powa should be in a dedicated database and the
     * register function handle to be called several time, so it's not critical
     */
    PERFORM public.powa_kcache_register();
    PERFORM public.powa_qualstats_register();
END;
$_$;

CREATE EVENT TRIGGER powa_check_created_extensions
    ON ddl_command_end
    WHEN tag IN ('CREATE EXTENSION')
    EXECUTE PROCEDURE public.powa_check_created_extensions() ;

CREATE OR REPLACE FUNCTION public.powa_check_dropped_extensions()
RETURNS event_trigger
LANGUAGE plpgsql
AS $_$
DECLARE
    funcname text;
    v_state   text;
    v_msg     text;
    v_detail  text;
    v_hint    text;
    v_context text;
BEGIN
    WITH ext AS (
        SELECT object_name
        FROM pg_event_trigger_dropped_objects() d
        WHERE d.object_type = 'extension'
    )
    SELECT function_name INTO funcname
    FROM powa_functions f
    JOIN ext ON f.module = ext.object_name
    WHERE operation = 'unregister';

    IF ( funcname IS NOT NULL ) THEN
        BEGIN
            RAISE DEBUG 'running %', funcname;
            EXECUTE 'SELECT ' || quote_ident(funcname) || '()';
        EXCEPTION
          WHEN OTHERS THEN
            GET STACKED DIAGNOSTICS
                v_state   = RETURNED_SQLSTATE,
                v_msg     = MESSAGE_TEXT,
                v_detail  = PG_EXCEPTION_DETAIL,
                v_hint    = PG_EXCEPTION_HINT,
                v_context = PG_EXCEPTION_CONTEXT;
            RAISE WARNING 'powa_check_dropped_extensions(): function "%" failed:
                state  : %
                message: %
                detail : %
                hint   : %
                context: %', funcname, v_state, v_msg, v_detail, v_hint, v_context;
        END;
    END IF;
END;
$_$;

CREATE EVENT TRIGGER powa_check_dropped_extensions
    ON sql_drop
    WHEN tag IN ('DROP EXTENSION')
    EXECUTE PROCEDURE public.powa_check_dropped_extensions() ;

CREATE OR REPLACE FUNCTION powa_take_snapshot() RETURNS void AS $PROC$
DECLARE
  purgets timestamp with time zone;
  purge_seq bigint;
  funcname text;
  v_state   text;
  v_msg     text;
  v_detail  text;
  v_hint    text;
  v_context text;

BEGIN
    -- For all snapshot functions in the powa_functions table, execute
    FOR funcname IN SELECT function_name
                 FROM powa_functions
                 WHERE operation='snapshot' LOOP
      -- Call all of them, with no parameter
      RAISE debug 'fonction: %',funcname;
      BEGIN
        EXECUTE 'SELECT ' || quote_ident(funcname)||'()';
      EXCEPTION
        WHEN OTHERS THEN
          GET STACKED DIAGNOSTICS
              v_state   = RETURNED_SQLSTATE,
              v_msg     = MESSAGE_TEXT,
              v_detail  = PG_EXCEPTION_DETAIL,
              v_hint    = PG_EXCEPTION_HINT,
              v_context = PG_EXCEPTION_CONTEXT;
          RAISE warning 'powa_take_snapshot(): function "%" failed:
              state  : %
              message: %
              detail : %
              hint   : %
              context: %', funcname, v_state, v_msg, v_detail, v_hint, v_context;

      END;
    END LOOP;

    -- Coalesce datas if needed
    SELECT nextval('powa_coalesce_sequence'::regclass) INTO purge_seq;

    IF (  purge_seq
            % current_setting('powa.coalesce')::bigint ) = 0
    THEN
      FOR funcname IN SELECT function_name
                   FROM powa_functions
                   WHERE operation='aggregate' LOOP
        -- Call all of them, with no parameter
        BEGIN
          EXECUTE 'SELECT ' || quote_ident(funcname)||'()';
        EXCEPTION
          WHEN OTHERS THEN
            GET STACKED DIAGNOSTICS
                v_state   = RETURNED_SQLSTATE,
                v_msg     = MESSAGE_TEXT,
                v_detail  = PG_EXCEPTION_DETAIL,
                v_hint    = PG_EXCEPTION_HINT,
                v_context = PG_EXCEPTION_CONTEXT;
            RAISE warning 'powa_take_snapshot(): function "%" failed:
                state  : %
                message: %
                detail : %
                hint   : %
                context: %', funcname, v_state, v_msg, v_detail, v_hint, v_context;

        END;
      END LOOP;
      UPDATE powa_last_aggregation SET aggts = now();
    END IF;
    -- Once every 10 packs, we also purge
    IF (  purge_seq
            % (current_setting('powa.coalesce')::bigint *10) ) = 0
    THEN
      FOR funcname IN SELECT function_name
                   FROM powa_functions
                   WHERE operation='purge' LOOP
        -- Call all of them, with no parameter
        BEGIN
          EXECUTE 'SELECT ' || quote_ident(funcname)||'()';
        EXCEPTION
          WHEN OTHERS THEN
            GET STACKED DIAGNOSTICS
                v_state   = RETURNED_SQLSTATE,
                v_msg     = MESSAGE_TEXT,
                v_detail  = PG_EXCEPTION_DETAIL,
                v_hint    = PG_EXCEPTION_HINT,
                v_context = PG_EXCEPTION_CONTEXT;
            RAISE warning 'powa_take_snapshot(): function "%" failed:
                state  : %
                message: %
                detail : %
                hint   : %
                context: %', funcname, v_state, v_msg, v_detail, v_hint, v_context;

        END;
      END LOOP;
      UPDATE powa_last_purge SET purgets = now();
    END IF;
END;
$PROC$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION powa_statements_snapshot() RETURNS void AS $PROC$
DECLARE
    result boolean;
    ignore_regexp text:='^[[:space:]]*(BEGIN)'; -- Ignore begin at beginning of statement
BEGIN
    -- In this function, we capture statements, and also aggregate counters by database
    -- so that the first screens of powa stay reactive even though there may be thousands
    -- of different statements
    RAISE DEBUG 'running powa_statements_snapshot';
    WITH capture AS(
        SELECT pg_stat_statements.*
        FROM pg_stat_statements
        WHERE pg_stat_statements.query !~* ignore_regexp
    ),

    missing_statements AS(
        INSERT INTO powa_statements (queryid, dbid, userid, query)
            SELECT queryid, dbid, userid, query
            FROM capture c
            WHERE NOT EXISTS (SELECT 1
                              FROM powa_statements ps
                              WHERE ps.queryid = c.queryid
                              AND ps.dbid = c.dbid
                              AND ps.userid = c.userid
            )
    ),

    by_query AS (
        INSERT INTO powa_statements_history_current
            SELECT queryid, dbid, userid,
            ROW(
                now(), calls, total_time, rows, shared_blks_hit, shared_blks_read,
                shared_blks_dirtied, shared_blks_written, local_blks_hit, local_blks_read,
                local_blks_dirtied, local_blks_written, temp_blks_read, temp_blks_written,
                blk_read_time, blk_write_time
            )::powa_statement_history_record AS record
            FROM capture
    ),

    by_database AS (
        INSERT INTO powa_statements_history_current_db
            SELECT dbid,
            ROW(
                now(), sum(calls), sum(total_time), sum(rows), sum(shared_blks_hit), sum(shared_blks_read),
                sum(shared_blks_dirtied), sum(shared_blks_written), sum(local_blks_hit), sum(local_blks_read),
                sum(local_blks_dirtied), sum(local_blks_written), sum(temp_blks_read), sum(temp_blks_written),
                sum(blk_read_time), sum(blk_write_time)
            )::powa_statement_history_record AS record
            FROM capture
            GROUP BY dbid
    )

    SELECT true::boolean INTO result; -- For now we don't care. What could we do on error except crash anyway?
END;
$PROC$ language plpgsql;

CREATE OR REPLACE FUNCTION powa_statements_purge() RETURNS void AS $PROC$
BEGIN
    RAISE DEBUG 'running powa_statements_purge';
    -- Delete obsolete datas. We only bother with already coalesced data
    DELETE FROM powa_statements_history WHERE upper(coalesce_range)< (now() - current_setting('powa.retention')::interval);
    DELETE FROM powa_statements_history_db WHERE upper(coalesce_range)< (now() - current_setting('powa.retention')::interval);
    -- FIXME maybe we should cleanup the powa_statements table ? But it will take a while: unnest all records...
END;
$PROC$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION powa_statements_aggregate() RETURNS void AS $PROC$
BEGIN
    RAISE DEBUG 'running powa_statements_aggregate';

    -- aggregate statements table
    LOCK TABLE powa_statements_history_current IN SHARE MODE; -- prevent any other update

    INSERT INTO powa_statements_history
        SELECT queryid, dbid, userid,
            tstzrange(min((record).ts), max((record).ts),'[]'),
            array_agg(record)
        FROM powa_statements_history_current
        GROUP BY queryid, dbid, userid;

    TRUNCATE powa_statements_history_current;

    -- aggregate db table
    LOCK TABLE powa_statements_history_current_db IN SHARE MODE; -- prevent any other update

    INSERT INTO powa_statements_history_db
        SELECT dbid,
            tstzrange(min((record).ts), max((record).ts),'[]'),
            array_agg(record)
        FROM powa_statements_history_current_db
        GROUP BY dbid;

    TRUNCATE powa_statements_history_current_db;
 END;
$PROC$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION public.powa_stats_reset()
 RETURNS boolean
 LANGUAGE plpgsql
AS $function$
BEGIN
    TRUNCATE TABLE powa_statements_history;
    TRUNCATE TABLE powa_statements_history_current;
    TRUNCATE TABLE powa_statements_history_db;
    TRUNCATE TABLE powa_statements_history_current_db;
    TRUNCATE TABLE powa_statements;
    RETURN true;
END;
$function$;

/* pg_stat_kcache integration - part 2 */

/*
 * register pg_stat_kcache extension
 */
CREATE OR REPLACE function public.powa_kcache_register() RETURNS bool AS
$_$
DECLARE
    v_func_present bool;
    v_ext_present bool;
BEGIN
    SELECT COUNT(*) = 1 INTO v_ext_present FROM pg_extension WHERE extname = 'pg_stat_kcache';

    IF ( v_ext_present ) THEN
        SELECT COUNT(*) > 0 INTO v_func_present FROM public.powa_functions WHERE module = 'pg_stat_kcache';
        IF ( NOT v_func_present) THEN
            INSERT INTO powa_functions (module, operation, function_name, added_manually)
            VALUES ('pg_stat_kcache', 'snapshot',   'powa_kcache_snapshot',   false),
                   ('pg_stat_kcache', 'aggregate',  'powa_kcache_aggregate',  false),
                   ('pg_stat_kcache', 'unregister', 'powa_kcache_unregister', false),
                   ('pg_stat_kcache', 'purge',      'powa_kcache_purge',      false);
        END IF;
    END IF;

    RETURN true;
END;
$_$
language plpgsql;

/*
 * unregister pg_stat_kcache extension
 */
CREATE OR REPLACE function public.powa_kcache_unregister() RETURNS bool AS
$_$
BEGIN
    DELETE FROM public.powa_functions WHERE module = 'pg_stat_kcache';
    RETURN true;
END;
$_$
language plpgsql;

/*
 * powa_kcache snapshot collection.
 */
CREATE OR REPLACE FUNCTION powa_kcache_snapshot() RETURNS void as $PROC$
DECLARE
  result bool;
BEGIN
    RAISE DEBUG 'running powa_kcache_snapshot';

    WITH capture AS (
        SELECT *
        FROM pg_stat_kcache()
    ),

    by_query AS (
        INSERT INTO powa_kcache_metrics_current (queryid, dbid, userid, metrics)
            SELECT queryid, dbid, userid, (now(), reads, writes, user_time, system_time)::kcache_type
            FROM capture
    ),

    by_database AS (
        INSERT INTO powa_kcache_metrics_current_db (dbid, metrics)
            SELECT dbid, (now(), sum(reads), sum(writes), sum(user_time), sum(system_time))::kcache_type
            FROM capture
            GROUP BY dbid
    )

    SELECT true into result;
END
$PROC$ language plpgsql;

/*
 * powa_kcache aggregation
 */
CREATE OR REPLACE FUNCTION powa_kcache_aggregate() RETURNS void AS $PROC$
DECLARE
  result bool;
BEGIN
    RAISE DEBUG 'running powa_kcache_aggregate';

    -- aggregate metrics table
    LOCK TABLE powa_kcache_metrics_current IN SHARE MODE; -- prevent any other update

    INSERT INTO powa_kcache_metrics (coalesce_range, queryid, dbid, userid, metrics)
        SELECT tstzrange(min((metrics).ts), max((metrics).ts),'[]'),
        queryid, dbid, userid, array_agg(metrics)
        FROM powa_kcache_metrics_current
        GROUP BY queryid, dbid, userid;

    TRUNCATE powa_kcache_metrics_current;

    -- aggregate metrics_db table
    LOCK TABLE powa_kcache_metrics_current_db IN SHARE MODE; -- prevent any other update

    INSERT INTO powa_kcache_metrics_db (coalesce_range, dbid, metrics)
        SELECT tstzrange(min((metrics).ts), max((metrics).ts),'[]'),
        dbid, array_agg(metrics)
        FROM powa_kcache_metrics_current_db
        GROUP BY dbid;

    TRUNCATE powa_kcache_metrics_current_db;
END
$PROC$ language plpgsql;

/*
 * powa_kcache purge
 */
CREATE OR REPLACE FUNCTION powa_kcache_purge() RETURNS void as $PROC$
BEGIN
    RAISE DEBUG 'running powa_kcache_purge';

    DELETE FROM powa_kcache_metrics WHERE upper(coalesce_range) < (now() - current_setting('powa.retention')::interval);
    DELETE FROM powa_kcache_metrics_db WHERE upper(coalesce_range) < (now() - current_setting('powa.retention')::interval);
END;
$PROC$ language plpgsql;

-- By default, try to register pg_stat_kcache, in case it's alreay here
SELECT * FROM public.powa_kcache_register();

/* end of pg_stat_kcache integration - part 2 */

/* pg_qualstats integration - part 2 */

/*
 * powa_qualstats_register
 */
CREATE OR REPLACE function public.powa_qualstats_register() RETURNS bool AS
$_$
DECLARE
    v_func_present bool;
    v_ext_present bool;
BEGIN
    SELECT COUNT(*) = 1 INTO v_ext_present FROM pg_extension WHERE extname = 'pg_qualstats';

    IF ( v_ext_present) THEN
        SELECT COUNT(*) > 0 INTO v_func_present FROM public.powa_functions WHERE function_name IN ('powa_qualstats_snapshot', 'powa_qualstats_aggregate', 'powa_qualstats_purge');
        IF ( NOT v_func_present) THEN
            INSERT INTO powa_functions (module, operation, function_name, added_manually)
            VALUES ('pg_qualstats', 'snapshot',   'powa_qualstats_snapshot',   false),
                   ('pg_qualstats', 'aggregate',  'powa_qualstats_aggregate',  false),
                   ('pg_qualstats', 'unregister', 'powa_qualstats_unregister', false),
                   ('pg_qualstats', 'purge',      'powa_qualstats_purge',      false);
        END IF;
    END IF;

    RETURN true;
END;
$_$
language plpgsql;

/*
 * powa_qualstats utility view for aggregating constvalues
 */
CREATE OR REPLACE VIEW powa_qualstats_aggregate_constvalues_current AS
WITH consts AS (
  SELECT qualid, queryid, dbid, userid, min(ts) as mints, max(ts) as maxts, sum(nbfiltered) as nbfiltered,
  sum(count) as count, constvalues
  FROM powa_qualstats_constvalues_history_current
  GROUP BY qualid, queryid, dbid, userid, constvalues
),
groups AS (
  SELECT qualid, queryid, dbid, userid, tstzrange(min(mints), max(maxts),'[]')
  FROM consts
  GROUP BY qualid, queryid, dbid, userid
)
SELECT *
FROM groups,
LATERAL (
  SELECT array_agg(constvalues) as mf
  FROM (
    SELECT (constvalues, nbfiltered, count)::qual_values as constvalues
    FROM consts
    WHERE consts.qualid = groups.qualid AND consts.queryid = groups.queryid
    AND consts.dbid = groups.dbid AND consts.userid = groups.userid
    ORDER BY CASE WHEN count = 0 THEN 0 ELSE nbfiltered / count::numeric END DESC
    LIMIT 20
  ) s
) as mf,
LATERAL (
  SELECT array_agg(constvalues) as lf
  FROM (
    SELECT (constvalues, nbfiltered, count)::qual_values as constvalues
    FROM consts
    WHERE consts.qualid = groups.qualid AND consts.queryid = groups.queryid
    AND consts.dbid = groups.dbid AND consts.userid = groups.userid
    ORDER BY CASE WHEN count = 0 THEN 0 ELSE nbfiltered / count::numeric END DESC
    LIMIT 20
  ) s
) as lf,
LATERAL (
  SELECT array_agg(constvalues) as me
  FROM (
    SELECT (constvalues, nbfiltered, count)::qual_values as constvalues
    FROM consts
    WHERE consts.qualid = groups.qualid AND consts.queryid = groups.queryid
    AND consts.dbid = groups.dbid AND consts.userid = groups.userid
    ORDER BY count desc
    LIMIT 20
  ) s
) as me;


CREATE OR REPLACE FUNCTION powa_qualstats_snapshot() RETURNS void as $PROC$
DECLARE
  result bool;
BEGIN
  RAISE DEBUG 'running powa_qualstats_snaphot';
  WITH capture AS (
    SELECT pgqs.*, s.query
    FROM pg_qualstats_by_query pgqs
    JOIN powa_statements s USING(queryid, dbid, userid)
  ),
  missing_quals AS (
      INSERT INTO powa_qualstats_quals (qualid, queryid, dbid, userid, quals)
        SELECT DISTINCT qs.qualnodeid, qs.queryid, qs.dbid, qs.userid, array_agg(DISTINCT q::qual_type)
        FROM capture qs,
        LATERAL (SELECT (unnest(quals)).*) as q
        WHERE NOT EXISTS (
          SELECT 1
          FROM powa_qualstats_quals nh
          WHERE nh.qualid = qs.qualnodeid AND nh.queryid = qs.queryid
            AND nh.dbid = qs.dbid AND nh.userid = qs.userid
        )
        GROUP BY qualnodeid, queryid, dbid, userid
      RETURNING *
  ),
  by_qual AS (
      INSERT INTO powa_qualstats_quals_history_current (qualid, queryid, dbid, userid, ts, count, nbfiltered)
      SELECT qs.qualnodeid, qs.queryid, qs.dbid, qs.userid, now(), sum(count), sum(nbfiltered)
        FROM capture as qs
        GROUP BY qualnodeid, qs.queryid, qs.dbid, qs.userid
      RETURNING *
  ),
  by_qual_with_const AS (
      INSERT INTO powa_qualstats_constvalues_history_current(qualid, queryid, dbid, userid, ts, count, nbfiltered, constvalues)
      SELECT qualnodeid, qs.queryid, qs.dbid, qs.userid, now(), count, nbfiltered, constvalues
      FROM capture as qs
  )
  SELECT true into result;
  PERFORM pg_qualstats_reset();
END
$PROC$ language plpgsql;

/*
 * powa_qualstats aggregate
 */
CREATE OR REPLACE FUNCTION powa_qualstats_aggregate() RETURNS void AS $PROC$
DECLARE
  result bool;
BEGIN
  RAISE DEBUG 'running powa_qualstats_aggregate';
  LOCK TABLE powa_qualstats_constvalues_history_current IN SHARE MODE;
  LOCK TABLE powa_qualstats_quals_history_current IN SHARE MODE;
  INSERT INTO powa_qualstats_constvalues_history (
    qualid, queryid, dbid, userid, coalesce_range, most_filtering, least_filtering, most_executed)
    SELECT * FROM powa_qualstats_aggregate_constvalues_current;
  INSERT INTO powa_qualstats_quals_history (qualid, queryid, dbid, userid, coalesce_range, records)
    SELECT qualid, queryid, dbid, userid, tstzrange(min(ts), max(ts),'[]'), array_agg((ts, count, nbfiltered)::powa_qualstats_history_item)
    FROM powa_qualstats_quals_history_current
    GROUP BY qualid, queryid, dbid, userid;
  TRUNCATE powa_qualstats_constvalues_history_current;
  TRUNCATE powa_qualstats_quals_history_current;
END
$PROC$ language plpgsql;

/*
 * powa_qualstats_purge
 */
CREATE OR REPLACE FUNCTION powa_qualstats_purge() RETURNS void as $PROC$
BEGIN
  RAISE DEBUG 'running powa_qualstats_purge';
  DELETE FROM powa_qualstats_constvalues_history WHERE upper(coalesce_range) < (now() - current_setting('powa.retention')::interval);
  DELETE FROM powa_qualstats_quals_history WHERE upper(coalesce_range) < (now() - current_setting('powa.retention')::interval);
END;
$PROC$ language plpgsql;

/*
 * powa_qualstats_unregister
 */
CREATE OR REPLACE function public.powa_qualstats_unregister() RETURNS bool AS
$_$
BEGIN
    DELETE FROM public.powa_functions WHERE module = 'pg_qualstats';
    RETURN true;
END;
$_$
language plpgsql;

SELECT * FROM public.powa_qualstats_register();

/* end of pg_qualstats_integration - part 2 */