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Add bt_multi_page_stats() function to contrib/pageinspect.

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This is like the existing bt_page_stats() function, but it can
report on a range of pages rather than just one at a time.

I don't have a huge amount of faith in the portability of the
new test cases, but they do pass in a 32-bit FreeBSD VM here.
Further adjustment may be needed depending on buildfarm results.

Hamid Akhtar, reviewed by Naeem Akhter, Bertrand Drouvot,
Bharath Rupireddy, and myself

Discussion: https://postgr.es/m/CANugjht-=oGMRmNJKMqnBC69y7vr+wHDmm0ZK6-1pJsxoBKBbA@mail.gmail.com
This commit is contained in:
Tom Lane
2023-01-02 13:02:29 -05:00
parent e351f85418
commit 1fd3dd2048
8 changed files with 428 additions and 80 deletions
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11
contrib/pageinspect/sql/btree.sql
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@ -11,6 +11,17 @@ SELECT * FROM bt_page_stats('test1_a_idx', 0);
SELECT * FROM bt_page_stats('test1_a_idx', 1);
SELECT * FROM bt_page_stats('test1_a_idx', 2);
-- bt_multi_page_stats() function returns a set of records of page statistics.
CREATE TABLE test2 AS (SELECT generate_series(1, 1000)::int8 AS col1);
CREATE INDEX test2_col1_idx ON test2(col1);
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 3, 2);
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 7, 2);
DROP TABLE test2;
SELECT * FROM bt_page_items('test1_a_idx', -1);
SELECT * FROM bt_page_items('test1_a_idx', 0);
SELECT * FROM bt_page_items('test1_a_idx', 1);