Merge pull request ClickHouse#79840 from ClickHouse/add-test-65690

Add a test for ClickHouse#65690

Author: alexey-milovidov

tests/queries/0_stateless/03455_direct_io_read_array_values.reference

@@ -0,0 +1,11 @@
+[]
+['{"c":"0"}']
+['{"c":"0"}','{"c":"1"}']
+['{"c":"0"}','{"c":"1"}','{"c":"2"}']
+['{"c":"0"}','{"c":"1"}','{"c":"2"}','{"c":"3"}']
+['{"c":"0"}','{"c":"1"}','{"c":"2"}','{"c":"3"}','{"c":"4"}']
+['{"d":"0"}']
+['{"d":"0"}','{"d":"1"}']
+['{"d":"0"}','{"d":"1"}','{"d":"2"}']
+['{"d":"0"}','{"d":"1"}','{"d":"2"}','{"d":"3"}']
+['{"d":"0"}','{"d":"1"}','{"d":"2"}','{"d":"3"}','{"d":"4"}']

tests/queries/0_stateless/03455_direct_io_read_array_values.sql

@@ -0,0 +1,19 @@
+-- Tags: long
+
+set max_threads = 3;
+set min_bytes_to_use_direct_io = 1;
+
+drop table if exists test;
+create table test (id UInt64, json JSON(max_dynamic_paths=4)) engine=MergeTree order by id settings min_rows_for_wide_part=1, min_bytes_for_wide_part=1, vertical_merge_algorithm_min_rows_to_activate=1, vertical_merge_algorithm_min_columns_to_activate=1, index_granularity_bytes=28437532, merge_max_block_size=3520, index_granularity=26762;
+
+system stop merges test;
+insert into test select number, toJSONString(map('a', number)) from numbers(100000);
+insert into test select number, toJSONString(map('b', arrayMap(x -> map('c', x), range(number % 5 + 1)))) from numbers(100000);
+insert into test select number, toJSONString(map('b', arrayMap(x -> map('d', x), range(number % 5 + 1)))) from numbers(50000);
+
+system start merges test;
+optimize table test final;
+
+select * from (select distinct json.b[] from test) order by all;
+
+drop table test;