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CREATE TABLE test1 (x int, y int[]);
INSERT INTO test1 VALUES (1, ARRAY[11, 111]);
CREATE INDEX test1_y_idx ON test1 USING gin (y) WITH (fastupdate = off);
\x
SELECT * FROM gin_metapage_info(get_raw_page('test1_y_idx', 0));
SELECT * FROM gin_metapage_info(get_raw_page('test1_y_idx', 1));
SELECT * FROM gin_page_opaque_info(get_raw_page('test1_y_idx', 1));
SELECT * FROM gin_leafpage_items(get_raw_page('test1_y_idx', 1));
INSERT INTO test1 SELECT x, ARRAY[1,10] FROM generate_series(2,10000) x;
SELECT COUNT(*) > 0
FROM gin_leafpage_items(get_raw_page('test1_y_idx',
(pg_relation_size('test1_y_idx') /
current_setting('block_size')::bigint)::int - 1));
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