postgresql/src/test/regress/sql/stats_import.sql

CREATE SCHEMA stats_import;

CREATE TYPE stats_import.complex_type AS (
    a integer,
    b real,
    c text,
    d date,
    e jsonb);

CREATE TABLE stats_import.test(
    id INTEGER PRIMARY KEY,
    name text,
    comp stats_import.complex_type,
    arange int4range,
    tags text[]
) WITH (autovacuum_enabled = false);

SELECT
    pg_catalog.pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test',
        'relpages', 18::integer,
        'reltuples', 21::real,
        'relallvisible', 24::integer,
	'relallfrozen', 27::integer);

-- CREATE INDEX on a table with autovac disabled should not overwrite
-- stats
CREATE INDEX test_i ON stats_import.test(id);

SELECT relname, relpages, reltuples, relallvisible, relallfrozen
FROM pg_class
WHERE oid = 'stats_import.test'::regclass
ORDER BY relname;

SELECT pg_clear_relation_stats('stats_import', 'test');

--
-- relstats tests
--

-- error: schemaname missing
SELECT pg_catalog.pg_restore_relation_stats(
        'relname', 'test',
        'relpages', 17::integer);

-- error: relname missing
SELECT pg_catalog.pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relpages', 17::integer);

--- error: schemaname is wrong type
SELECT pg_catalog.pg_restore_relation_stats(
        'schemaname', 3.6::float,
        'relname', 'test',
        'relpages', 17::integer);

--- error: relname is wrong type
SELECT pg_catalog.pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 0::oid,
        'relpages', 17::integer);

-- error: relation not found
SELECT pg_catalog.pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'nope',
        'relpages', 17::integer);

-- error: odd number of variadic arguments cannot be pairs
SELECT pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test',
        'relallvisible');

-- error: argument name is NULL
SELECT pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test',
        NULL, '17'::integer);

-- starting stats
SELECT relpages, reltuples, relallvisible, relallfrozen
FROM pg_class
WHERE oid = 'stats_import.test_i'::regclass;

-- regular indexes have special case locking rules
BEGIN;
SELECT pg_catalog.pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test_i',
        'relpages', 18::integer);

SELECT mode FROM pg_locks
WHERE relation = 'stats_import.test'::regclass AND
      pid = pg_backend_pid() AND granted;

SELECT mode FROM pg_locks
WHERE relation = 'stats_import.test_i'::regclass AND
      pid = pg_backend_pid() AND granted;

COMMIT;

--  relpages may be -1 for partitioned tables
CREATE TABLE stats_import.part_parent ( i integer ) PARTITION BY RANGE(i);
CREATE TABLE stats_import.part_child_1
  PARTITION OF stats_import.part_parent
  FOR VALUES FROM (0) TO (10)
  WITH (autovacuum_enabled = false);

CREATE INDEX part_parent_i ON stats_import.part_parent(i);

ANALYZE stats_import.part_parent;

SELECT relpages
FROM pg_class
WHERE oid = 'stats_import.part_parent'::regclass;

--
-- Partitioned indexes aren't analyzed but it is possible to set
-- stats. The locking rules are different from normal indexes due to
-- the rules for in-place updates: both the partitioned table and the
-- partitioned index are locked in ShareUpdateExclusive mode.
--
BEGIN;

SELECT pg_catalog.pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'part_parent_i',
        'relpages', 2::integer);

SELECT mode FROM pg_locks
WHERE relation = 'stats_import.part_parent'::regclass AND
      pid = pg_backend_pid() AND granted;

SELECT mode FROM pg_locks
WHERE relation = 'stats_import.part_parent_i'::regclass AND
      pid = pg_backend_pid() AND granted;

COMMIT;

SELECT relpages
FROM pg_class
WHERE oid = 'stats_import.part_parent_i'::regclass;

-- ok: set all relstats, with version, no bounds checking
SELECT pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test',
        'version', 150000::integer,
        'relpages', '-17'::integer,
        'reltuples', 400::real,
        'relallvisible', 4::integer,
        'relallfrozen', 2::integer);

SELECT relpages, reltuples, relallvisible, relallfrozen
FROM pg_class
WHERE oid = 'stats_import.test'::regclass;

-- ok: set just relpages, rest stay same
SELECT pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test',
        'relpages', '16'::integer);

SELECT relpages, reltuples, relallvisible, relallfrozen
FROM pg_class
WHERE oid = 'stats_import.test'::regclass;

-- ok: set just reltuples, rest stay same
SELECT pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test',
        'reltuples', '500'::real);

SELECT relpages, reltuples, relallvisible, relallfrozen
FROM pg_class
WHERE oid = 'stats_import.test'::regclass;

-- ok: set just relallvisible, rest stay same
SELECT pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test',
        'relallvisible', 5::integer);

SELECT relpages, reltuples, relallvisible, relallfrozen
FROM pg_class
WHERE oid = 'stats_import.test'::regclass;

-- ok: just relallfrozen
SELECT pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test',
        'version', 150000::integer,
        'relallfrozen', 3::integer);

SELECT relpages, reltuples, relallvisible, relallfrozen
FROM pg_class
WHERE oid = 'stats_import.test'::regclass;

-- warn: bad relpages type, rest updated
SELECT pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test',
        'relpages', 'nope'::text,
        'reltuples', 400.0::real,
        'relallvisible', 4::integer,
        'relallfrozen', 3::integer);

SELECT relpages, reltuples, relallvisible, relallfrozen
FROM pg_class
WHERE oid = 'stats_import.test'::regclass;

-- unrecognized argument name, rest ok
SELECT pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'test',
        'relpages', '171'::integer,
        'nope', 10::integer);

SELECT relpages, reltuples, relallvisible
FROM pg_class
WHERE oid = 'stats_import.test'::regclass;

-- ok: clear stats
SELECT pg_catalog.pg_clear_relation_stats(schemaname => 'stats_import', relname => 'test');

SELECT relpages, reltuples, relallvisible
FROM pg_class
WHERE oid = 'stats_import.test'::regclass;

-- invalid relkinds for statistics
CREATE SEQUENCE stats_import.testseq;

SELECT pg_catalog.pg_restore_relation_stats(
        'schemaname', 'stats_import',
        'relname', 'testseq');

SELECT pg_catalog.pg_clear_relation_stats(schemaname => 'stats_import', relname => 'testseq');

CREATE VIEW stats_import.testview AS SELECT * FROM stats_import.test;

SELECT pg_catalog.pg_clear_relation_stats(schemaname => 'stats_import', relname => 'testview');

--
-- attribute stats
--

-- error: schemaname missing
SELECT pg_catalog.pg_restore_attribute_stats(
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.1::real);

-- error: schema does not exist
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'nope',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.1::real);

-- error: relname missing
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.1::real);

-- error: relname does not exist
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'nope',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.1::real);

-- error: relname null
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', NULL,
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.1::real);

-- error: NULL attname
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', NULL,
    'inherited', false::boolean,
    'null_frac', 0.1::real);

-- error: attname doesn't exist
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'nope',
    'inherited', false::boolean,
    'null_frac', 0.1::real,
    'avg_width', 2::integer,
    'n_distinct', 0.3::real);

-- error: both attname and attnum
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'attnum', 1::smallint,
    'inherited', false::boolean,
    'null_frac', 0.1::real);

-- error: neither attname nor attnum
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'inherited', false::boolean,
    'null_frac', 0.1::real);

-- error: attribute is system column
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'xmin',
    'inherited', false::boolean,
    'null_frac', 0.1::real);

-- error: inherited null
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', NULL::boolean,
    'null_frac', 0.1::real);

-- ok: just the fixed values, with version, no stakinds
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'version', 150000::integer,
    'null_frac', 0.2::real,
    'avg_width', 5::integer,
    'n_distinct', 0.6::real);

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

--
-- ok: restore by attnum, we normally reserve this for
-- indexes, but there is no reason it shouldn't work
-- for any stat-having relation.
--
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attnum', 1::smallint,
    'inherited', false::boolean,
    'null_frac', 0.4::real);

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: unrecognized argument name, rest get set
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.2::real,
    'nope', 0.5::real);

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: mcv / mcf null mismatch part 1, rest get set
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.21::real,
    'most_common_freqs', '{0.1,0.2,0.3}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: mcv / mcf null mismatch part 2, rest get set
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.21::real,
    'most_common_vals', '{1,2,3}'::text
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: mcf type mismatch, mcv-pair fails, rest get set
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.22::real,
    'most_common_vals', '{2,1,3}'::text,
    'most_common_freqs', '{0.2,0.1}'::double precision[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: mcv cast failure, mcv-pair fails, rest get set
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.23::real,
    'most_common_vals', '{2,four,3}'::text,
    'most_common_freqs', '{0.3,0.25,0.05}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: mcv / mcf array length mismatch (more vals), mcv-pair fails, rest get set
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.24::real,
    'most_common_vals', '{2,1,3}'::text,
    'most_common_freqs', '{0.3,0.25}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: mcv / mcf array length mismatch (more freqs), mcv-pair fails, rest get set
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.25::real,
    'most_common_vals', '{2,1}'::text,
    'most_common_freqs', '{0.3,0.25,0.05}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: most_common_vals is multi-dimensional, mcv-pair fails, rest get set
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.26::real,
    'most_common_vals', '{{2,1},{3,4}}'::text,
    'most_common_freqs', '{0.3,0.25,0.05,0.04}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- ok: mcv+mcf
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'most_common_vals', '{2,1,3}'::text,
    'most_common_freqs', '{0.3,0.25,0.05}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: NULL in histogram array, rest get set
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.24::real,
    'histogram_bounds', '{1,NULL,3,4}'::text
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- ok: histogram_bounds
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'histogram_bounds', '{1,2,3,4}'::text
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: elem_count_histogram null element, rest get set
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'tags',
    'inherited', false::boolean,
    'null_frac', 0.25::real,
    'elem_count_histogram', '{1,1,NULL,1,1,1,1,1}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'tags';

-- ok: elem_count_histogram
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'tags',
    'inherited', false::boolean,
    'null_frac', 0.26::real,
    'elem_count_histogram', '{1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'tags';

-- warn: range stats on a scalar type, rest ok
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.27::real,
    'range_empty_frac', 0.5::real,
    'range_length_histogram', '{399,499,Infinity}'::text
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: range_empty_frac range_length_hist null mismatch, rest ok
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'arange',
    'inherited', false::boolean,
    'null_frac', 0.28::real,
    'range_length_histogram', '{399,499,Infinity}'::text
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'arange';

-- warn: range_empty_frac range_length_hist null mismatch part 2, rest ok
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'arange',
    'inherited', false::boolean,
    'null_frac', 0.29::real,
    'range_empty_frac', 0.5::real
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'arange';

-- ok: range_empty_frac + range_length_hist
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'arange',
    'inherited', false::boolean,
    'range_empty_frac', 0.5::real,
    'range_length_histogram', '{399,499,Infinity}'::text
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'arange';

-- warn: range bounds histogram on scalar, rest ok
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.31::real,
    'range_bounds_histogram', '{"[-1,1)","[0,4)","[1,4)","[1,100)"}'::text
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- ok: range_bounds_histogram
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'arange',
    'inherited', false::boolean,
    'range_bounds_histogram', '{"[-1,1)","[0,4)","[1,4)","[1,100)"}'::text
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'arange';

-- warn: cannot set most_common_elems for range type, rest ok
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'arange',
    'inherited', false::boolean,
    'null_frac', 0.32::real,
    'most_common_elems', '{3,1}'::text,
    'most_common_elem_freqs', '{0.3,0.2,0.2,0.3,0.0}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'arange';

-- warn: scalars can't have mcelem, rest ok
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.33::real,
    'most_common_elems', '{1,3}'::text,
    'most_common_elem_freqs', '{0.3,0.2,0.2,0.3,0.0}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

-- warn: mcelem / mcelem mismatch, rest ok
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'tags',
    'inherited', false::boolean,
    'null_frac', 0.34::real,
    'most_common_elems', '{one,two}'::text
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'tags';

-- warn: mcelem / mcelem null mismatch part 2, rest ok
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'tags',
    'inherited', false::boolean,
    'null_frac', 0.35::real,
    'most_common_elem_freqs', '{0.3,0.2,0.2,0.3}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'tags';

-- ok: mcelem
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'tags',
    'inherited', false::boolean,
    'most_common_elems', '{one,three}'::text,
    'most_common_elem_freqs', '{0.3,0.2,0.2,0.3,0.0}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'tags';

-- warn: scalars can't have elem_count_histogram, rest ok
SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'stats_import',
    'relname', 'test',
    'attname', 'id',
    'inherited', false::boolean,
    'null_frac', 0.36::real,
    'elem_count_histogram', '{1,1,1,1,1,1,1,1,1,1}'::real[]
    );

SELECT *
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'id';

--
-- Test the ability to exactly copy data from one table to an identical table,
-- correctly reconstructing the stakind order as well as the staopN and
-- stacollN values. Because oids are not stable across databases, we can only
-- test this when the source and destination are on the same database
-- instance. For that reason, we borrow and adapt a query found in fe_utils
-- and used by pg_dump/pg_upgrade.
--
INSERT INTO stats_import.test
SELECT 1, 'one', (1, 1.1, 'ONE', '2001-01-01', '{ "xkey": "xval" }')::stats_import.complex_type, int4range(1,4), array['red','green']
UNION ALL
SELECT 2, 'two', (2, 2.2, 'TWO', '2002-02-02', '[true, 4, "six"]')::stats_import.complex_type,  int4range(1,4), array['blue','yellow']
UNION ALL
SELECT 3, 'tre', (3, 3.3, 'TRE', '2003-03-03', NULL)::stats_import.complex_type, int4range(-1,1), array['"orange"', 'purple', 'cyan']
UNION ALL
SELECT 4, 'four', NULL, int4range(0,100), NULL;

CREATE INDEX is_odd ON stats_import.test(((comp).a % 2 = 1));

-- Generate statistics on table with data
ANALYZE stats_import.test;

CREATE TABLE stats_import.test_clone ( LIKE stats_import.test )
    WITH (autovacuum_enabled = false);

CREATE INDEX is_odd_clone ON stats_import.test_clone(((comp).a % 2 = 1));

--
-- Copy stats from test to test_clone, and is_odd to is_odd_clone
--
SELECT s.schemaname, s.tablename, s.attname, s.inherited, r.*
FROM pg_catalog.pg_stats AS s
CROSS JOIN LATERAL
    pg_catalog.pg_restore_attribute_stats(
        'schemaname', 'stats_import',
        'relname', s.tablename::text || '_clone',
        'attname', s.attname::text,
        'inherited', s.inherited,
        'version', 150000,
        'null_frac', s.null_frac,
        'avg_width', s.avg_width,
        'n_distinct', s.n_distinct,
        'most_common_vals', s.most_common_vals::text,
        'most_common_freqs', s.most_common_freqs,
        'histogram_bounds', s.histogram_bounds::text,
        'correlation', s.correlation,
        'most_common_elems', s.most_common_elems::text,
        'most_common_elem_freqs', s.most_common_elem_freqs,
        'elem_count_histogram', s.elem_count_histogram,
        'range_bounds_histogram', s.range_bounds_histogram::text,
        'range_empty_frac', s.range_empty_frac,
        'range_length_histogram', s.range_length_histogram::text) AS r
WHERE s.schemaname = 'stats_import'
AND s.tablename IN ('test', 'is_odd')
ORDER BY s.tablename, s.attname, s.inherited;

SELECT c.relname, COUNT(*) AS num_stats
FROM pg_class AS c
JOIN pg_statistic s ON s.starelid = c.oid
WHERE c.relnamespace = 'stats_import'::regnamespace
AND c.relname IN ('test', 'test_clone', 'is_odd', 'is_odd_clone')
GROUP BY c.relname
ORDER BY c.relname;

-- check test minus test_clone
SELECT
    a.attname, s.stainherit, s.stanullfrac, s.stawidth, s.stadistinct,
    s.stakind1, s.stakind2, s.stakind3, s.stakind4, s.stakind5,
    s.staop1, s.staop2, s.staop3, s.staop4, s.staop5,
    s.stacoll1, s.stacoll2, s.stacoll3, s.stacoll4, s.stacoll5,
    s.stanumbers1, s.stanumbers2, s.stanumbers3, s.stanumbers4, s.stanumbers5,
    s.stavalues1::text AS sv1, s.stavalues2::text AS sv2,
    s.stavalues3::text AS sv3, s.stavalues4::text AS sv4,
    s.stavalues5::text AS sv5, 'test' AS direction
FROM pg_statistic s
JOIN pg_attribute a ON a.attrelid = s.starelid AND a.attnum = s.staattnum
WHERE s.starelid = 'stats_import.test'::regclass
EXCEPT
SELECT
    a.attname, s.stainherit, s.stanullfrac, s.stawidth, s.stadistinct,
    s.stakind1, s.stakind2, s.stakind3, s.stakind4, s.stakind5,
    s.staop1, s.staop2, s.staop3, s.staop4, s.staop5,
    s.stacoll1, s.stacoll2, s.stacoll3, s.stacoll4, s.stacoll5,
    s.stanumbers1, s.stanumbers2, s.stanumbers3, s.stanumbers4, s.stanumbers5,
    s.stavalues1::text AS sv1, s.stavalues2::text AS sv2,
    s.stavalues3::text AS sv3, s.stavalues4::text AS sv4,
    s.stavalues5::text AS sv5, 'test' AS direction
FROM pg_statistic s
JOIN pg_attribute a ON a.attrelid = s.starelid AND a.attnum = s.staattnum
WHERE s.starelid = 'stats_import.test_clone'::regclass;

-- check test_clone minus test
SELECT
    a.attname, s.stainherit, s.stanullfrac, s.stawidth, s.stadistinct,
    s.stakind1, s.stakind2, s.stakind3, s.stakind4, s.stakind5,
    s.staop1, s.staop2, s.staop3, s.staop4, s.staop5,
    s.stacoll1, s.stacoll2, s.stacoll3, s.stacoll4, s.stacoll5,
    s.stanumbers1, s.stanumbers2, s.stanumbers3, s.stanumbers4, s.stanumbers5,
    s.stavalues1::text AS sv1, s.stavalues2::text AS sv2,
    s.stavalues3::text AS sv3, s.stavalues4::text AS sv4,
    s.stavalues5::text AS sv5, 'test_clone' AS direction
FROM pg_statistic s
JOIN pg_attribute a ON a.attrelid = s.starelid AND a.attnum = s.staattnum
WHERE s.starelid = 'stats_import.test_clone'::regclass
EXCEPT
SELECT
    a.attname, s.stainherit, s.stanullfrac, s.stawidth, s.stadistinct,
    s.stakind1, s.stakind2, s.stakind3, s.stakind4, s.stakind5,
    s.staop1, s.staop2, s.staop3, s.staop4, s.staop5,
    s.stacoll1, s.stacoll2, s.stacoll3, s.stacoll4, s.stacoll5,
    s.stanumbers1, s.stanumbers2, s.stanumbers3, s.stanumbers4, s.stanumbers5,
    s.stavalues1::text AS sv1, s.stavalues2::text AS sv2,
    s.stavalues3::text AS sv3, s.stavalues4::text AS sv4,
    s.stavalues5::text AS sv5, 'test_clone' AS direction
FROM pg_statistic s
JOIN pg_attribute a ON a.attrelid = s.starelid AND a.attnum = s.staattnum
WHERE s.starelid = 'stats_import.test'::regclass;

-- check is_odd minus is_odd_clone
SELECT
    a.attname, s.stainherit, s.stanullfrac, s.stawidth, s.stadistinct,
    s.stakind1, s.stakind2, s.stakind3, s.stakind4, s.stakind5,
    s.staop1, s.staop2, s.staop3, s.staop4, s.staop5,
    s.stacoll1, s.stacoll2, s.stacoll3, s.stacoll4, s.stacoll5,
    s.stanumbers1, s.stanumbers2, s.stanumbers3, s.stanumbers4, s.stanumbers5,
    s.stavalues1::text AS sv1, s.stavalues2::text AS sv2,
    s.stavalues3::text AS sv3, s.stavalues4::text AS sv4,
    s.stavalues5::text AS sv5, 'is_odd' AS direction
FROM pg_statistic s
JOIN pg_attribute a ON a.attrelid = s.starelid AND a.attnum = s.staattnum
WHERE s.starelid = 'stats_import.is_odd'::regclass
EXCEPT
SELECT
    a.attname, s.stainherit, s.stanullfrac, s.stawidth, s.stadistinct,
    s.stakind1, s.stakind2, s.stakind3, s.stakind4, s.stakind5,
    s.staop1, s.staop2, s.staop3, s.staop4, s.staop5,
    s.stacoll1, s.stacoll2, s.stacoll3, s.stacoll4, s.stacoll5,
    s.stanumbers1, s.stanumbers2, s.stanumbers3, s.stanumbers4, s.stanumbers5,
    s.stavalues1::text AS sv1, s.stavalues2::text AS sv2,
    s.stavalues3::text AS sv3, s.stavalues4::text AS sv4,
    s.stavalues5::text AS sv5, 'is_odd' AS direction
FROM pg_statistic s
JOIN pg_attribute a ON a.attrelid = s.starelid AND a.attnum = s.staattnum
WHERE s.starelid = 'stats_import.is_odd_clone'::regclass;

-- check is_odd_clone minus is_odd
SELECT
    a.attname, s.stainherit, s.stanullfrac, s.stawidth, s.stadistinct,
    s.stakind1, s.stakind2, s.stakind3, s.stakind4, s.stakind5,
    s.staop1, s.staop2, s.staop3, s.staop4, s.staop5,
    s.stacoll1, s.stacoll2, s.stacoll3, s.stacoll4, s.stacoll5,
    s.stanumbers1, s.stanumbers2, s.stanumbers3, s.stanumbers4, s.stanumbers5,
    s.stavalues1::text AS sv1, s.stavalues2::text AS sv2,
    s.stavalues3::text AS sv3, s.stavalues4::text AS sv4,
    s.stavalues5::text AS sv5, 'is_odd_clone' AS direction
FROM pg_statistic s
JOIN pg_attribute a ON a.attrelid = s.starelid AND a.attnum = s.staattnum
WHERE s.starelid = 'stats_import.is_odd_clone'::regclass
EXCEPT
SELECT
    a.attname, s.stainherit, s.stanullfrac, s.stawidth, s.stadistinct,
    s.stakind1, s.stakind2, s.stakind3, s.stakind4, s.stakind5,
    s.staop1, s.staop2, s.staop3, s.staop4, s.staop5,
    s.stacoll1, s.stacoll2, s.stacoll3, s.stacoll4, s.stacoll5,
    s.stanumbers1, s.stanumbers2, s.stanumbers3, s.stanumbers4, s.stanumbers5,
    s.stavalues1::text AS sv1, s.stavalues2::text AS sv2,
    s.stavalues3::text AS sv3, s.stavalues4::text AS sv4,
    s.stavalues5::text AS sv5, 'is_odd_clone' AS direction
FROM pg_statistic s
JOIN pg_attribute a ON a.attrelid = s.starelid AND a.attnum = s.staattnum
WHERE s.starelid = 'stats_import.is_odd'::regclass;

-- attribute stats exist before a clear, but not after
SELECT COUNT(*)
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'arange';

SELECT pg_catalog.pg_clear_attribute_stats(
    schemaname => 'stats_import',
    relname => 'test',
    attname => 'arange',
    inherited => false);

SELECT COUNT(*)
FROM pg_stats
WHERE schemaname = 'stats_import'
AND tablename = 'test'
AND inherited = false
AND attname = 'arange';

-- temp tables
CREATE TEMP TABLE stats_temp(i int);
SELECT pg_restore_relation_stats(
        'schemaname', 'pg_temp',
        'relname', 'stats_temp',
        'relpages', '-19'::integer,
        'reltuples', 401::real,
        'relallvisible', 5::integer,
        'relallfrozen', 3::integer);

SELECT relname, relpages, reltuples, relallvisible, relallfrozen
FROM pg_class
WHERE oid = 'pg_temp.stats_temp'::regclass
ORDER BY relname;

SELECT pg_catalog.pg_restore_attribute_stats(
    'schemaname', 'pg_temp',
    'relname', 'stats_temp',
    'attname', 'i',
    'inherited', false::boolean,
    'null_frac', 0.0123::real
    );

SELECT tablename, null_frac
FROM pg_stats
WHERE schemaname like 'pg_temp%'
AND tablename = 'stats_temp'
AND inherited = false
AND attname = 'i';
DROP TABLE stats_temp;
DROP SCHEMA stats_import CASCADE;