Backport ClickHouse#86906 to 25.8: Fix seeking at the end of the decompressed block

Author: robot-clickhouse

src/IO/ReadBuffer.cpp

@@ -107,6 +107,15 @@ bool ReadBuffer::next()
     }
     else
     {
+        /// It might happen that we need to skip all data in the buffer,
+        /// in this case we should call next() one more time to load new data.
+        if (nextimpl_working_buffer_offset == working_buffer.size())
+        {
+            pos = working_buffer.end();
+            nextimpl_working_buffer_offset = 0;
+            return next();
+        }
+
         pos = working_buffer.begin() + std::min(nextimpl_working_buffer_offset, working_buffer.size());
         chassert(position() < working_buffer.end());
     }

tests/queries/0_stateless/03620_json_advanced_shared_data_seek_bug.reference

@@ -0,0 +1,9 @@
+set use_variant_as_common_type = 1;
+
+drop table if exists test;
+create table test (id UInt64, json JSON(max_dynamic_paths=2, a.b.c UInt32)) engine=MergeTree order by id settings min_rows_for_wide_part=1000000000, min_bytes_for_wide_part=10000000000, index_granularity = 39547, object_serialization_version = 'v3', object_shared_data_serialization_version = 'advanced', object_shared_data_serialization_version_for_zero_level_parts = 'advanced', object_shared_data_buckets_for_compact_part = 3, object_shared_data_buckets_for_wide_part = 1, dynamic_serialization_version = 'v3';
+
+insert into test select number, number < 500000 ? toJSONString(map('a.b.c', number, 'a.b.d', number::UInt32, 'a.b.e', 'str_' || toString(number))) :  toJSONString(map('a.b.c', number, 'a.b.d', number::UInt32, 'a.b.e', 'str_' || toString(number), 'b.b._' || toString(number % 5), number::UInt32)) from numbers(400000, 200000);
+
+select json.b.b.`_1`.:String from test format Null settings max_threads=1;
+drop table test;