Backport ClickHouse#70172 to 24.8: Fix crash in JSON column

Author: robot-clickhouse

src/Columns/ColumnObject.cpp

@@ -87,6 +87,29 @@ ColumnObject::ColumnObject(
     shared_data = ColumnArray::create(ColumnTuple::create(std::move(paths_and_values)));
 }
 
+ColumnObject::ColumnObject(const ColumnObject & other)
+    : COWHelper<IColumnHelper<ColumnObject>, ColumnObject>(other)
+    , typed_paths(other.typed_paths)
+    , dynamic_paths(other.dynamic_paths)
+    , dynamic_paths_ptrs(other.dynamic_paths_ptrs)
+    , shared_data(other.shared_data)
+    , max_dynamic_paths(other.max_dynamic_paths)
+    , global_max_dynamic_paths(other.global_max_dynamic_paths)
+    , max_dynamic_types(other.max_dynamic_types)
+    , statistics(other.statistics)
+{
+    /// We should update string_view in sorted_typed_paths and sorted_dynamic_paths so they
+    /// point to the new strings in typed_paths and dynamic_paths.
+    sorted_typed_paths.clear();
+    for (const auto & [path, _] : typed_paths)
+        sorted_typed_paths.emplace_back(path);
+    std::sort(sorted_typed_paths.begin(), sorted_typed_paths.end());
+
+    sorted_dynamic_paths.clear();
+    for (const auto & [path, _] : dynamic_paths)
+        sorted_dynamic_paths.emplace(path);
+}
+
 ColumnObject::Ptr ColumnObject::create(
     const std::unordered_map<String, ColumnPtr> & typed_paths_,
     const std::unordered_map<String, ColumnPtr> & dynamic_paths_,

src/Columns/ColumnObject.h

@@ -54,6 +54,8 @@ class ColumnObject final : public COWHelper<IColumnHelper<ColumnObject>, ColumnO
         size_t max_dynamic_types_,
         const StatisticsPtr & statistics_ = {});
 
+    ColumnObject(const ColumnObject & other);
+
     /// Use StringHashForHeterogeneousLookup hash for hash maps to be able to use std::string_view in find() method.
     using PathToColumnMap = std::unordered_map<String, WrappedPtr, StringHashForHeterogeneousLookup, StringHashForHeterogeneousLookup::transparent_key_equal>;
     using PathToDynamicColumnPtrMap = std::unordered_map<String, ColumnDynamic *, StringHashForHeterogeneousLookup, StringHashForHeterogeneousLookup::transparent_key_equal>;

tests/queries/0_stateless/03247_object_column_copy.reference

@@ -0,0 +1,9 @@
+SET allow_experimental_json_type = 1;
+SET allow_experimental_variant_type = 1;
+DROP TABLE IF EXISTS t0;
+CREATE TABLE t0 (c0 Int) ENGINE = Memory();
+INSERT INTO t0 (c0) VALUES (1);
+ALTER TABLE t0 (ADD COLUMN c1 JSON(c1 Variant(Int,JSON(c1 Int))));
+INSERT INTO t0 (c0, c1) VALUES (2, '{"c1":1}'::JSON);
+SELECT kafkaMurmurHash(c1) FROM t0; -- {serverError NOT_IMPLEMENTED}
+DROP TABLE t0;