Final adjustments

src/from_substrait.cpp

@@ -75,8 +75,9 @@ string SubstraitToDuckDB::RemoveExtension(const string &function_name) {
 	return name;
 }
 
-SubstraitToDuckDB::SubstraitToDuckDB(shared_ptr<ClientContext> &context_p, const string &serialized, bool json)
-    : context(context_p) {
+SubstraitToDuckDB::SubstraitToDuckDB(shared_ptr<ClientContext> &context_p, const string &serialized, bool json,
+                                     bool acquire_lock_p)
+    : context(context_p), acquire_lock(acquire_lock_p) {
 	if (!json) {
 		if (!plan.ParseFromString(serialized)) {
 			throw std::runtime_error("Was not possible to convert binary into Substrait plan");
@@ -549,9 +550,9 @@ shared_ptr<Relation> SubstraitToDuckDB::TransformReadOp(const substrait::Rel &so
 			if (!table_info) {
 				throw CatalogException("Table '%s' does not exist!", table_name);
 			}
-			return make_shared_ptr<TableRelation>(context, std::move(table_info), false);
+			scan = make_shared_ptr<TableRelation>(context, std::move(table_info), acquire_lock);
 		} catch (...) {
-			scan = make_shared_ptr<ViewRelation>(context, DEFAULT_SCHEMA, table_name, false);
+			scan = make_shared_ptr<ViewRelation>(context, DEFAULT_SCHEMA, table_name, acquire_lock);
 		}
 	} else if (sget.has_local_files()) {
 		vector<Value> parquet_files;
@@ -573,8 +574,8 @@ shared_ptr<Relation> SubstraitToDuckDB::TransformReadOp(const substrait::Rel &so
 		string name = "parquet_" + StringUtil::GenerateRandomName();
 		named_parameter_map_t named_parameters({{"binary_as_string", Value::BOOLEAN(false)}});
 		vector<Value> parameters {Value::LIST(parquet_files)};
-		auto scan_rel = make_shared_ptr<TableFunctionRelation>(context, "parquet_scan", parameters,
-		                                                       std::move(named_parameters), nullptr, true, false);
+		auto scan_rel = make_shared_ptr<TableFunctionRelation>(
+		    context, "parquet_scan", parameters, std::move(named_parameters), nullptr, true, acquire_lock);
 		auto rel = static_cast<Relation *>(scan_rel.get());
 		scan = rel->Alias(name);
 	} else if (sget.has_virtual_table()) {
@@ -590,7 +591,7 @@ shared_ptr<Relation> SubstraitToDuckDB::TransformReadOp(const substrait::Rel &so
 			expression_rows.emplace_back(expression_row);
 		}
 		vector<string> column_names;
-		scan = make_shared_ptr<ValueRelation>(context, expression_rows, column_names, "values", false);
+		scan = make_shared_ptr<ValueRelation>(context, expression_rows, column_names, "values", acquire_lock);
 	} else {
 		throw NotImplementedException("Unsupported type of read operator for substrait");
 	}

src/include/from_substrait.hpp

@@ -18,7 +18,8 @@ namespace duckdb {
 
 class SubstraitToDuckDB {
 public:
-	SubstraitToDuckDB(shared_ptr<ClientContext> &context_p, const string &serialized, bool json = false);
+	SubstraitToDuckDB(shared_ptr<ClientContext> &context_p, const string &serialized, bool json = false,
+	                  bool acquire_lock = false);
 	//! Transforms Substrait Plan to DuckDB Relation
 	shared_ptr<Relation> TransformPlan();
 
@@ -67,5 +68,7 @@ class SubstraitToDuckDB {
 	static const unordered_map<std::string, std::string> function_names_remap;
 	static const case_insensitive_set_t valid_extract_subfields;
 	vector<ParsedExpression *> struct_expressions;
+	//! If we should acquire a client context lock when creating the relatiosn
+	const bool acquire_lock;
 };
 } // namespace duckdb

src/substrait_extension.cpp

@@ -146,18 +146,23 @@ static unique_ptr<FunctionData> ToJsonBind(ClientContext &context, TableFunction
 }
 
 shared_ptr<Relation> SubstraitPlanToDuckDBRel(shared_ptr<ClientContext> &context, const string &serialized,
-                                              bool json = false) {
-	SubstraitToDuckDB transformer_s2d(context, serialized, json);
+                                              bool json = false, bool acquire_lock = false) {
+	SubstraitToDuckDB transformer_s2d(context, serialized, json, acquire_lock);
 	return transformer_s2d.TransformPlan();
 }
 
+//! This function matches results of substrait plans with direct Duckdb queries
+//! Is only executed when pragma enable_verification = true
+//! It creates extra connections to be able to execute the consumed DuckDB Plan
+//! And the SQL query itself, ideally this wouldn't be necessary and won't
+//! work for round-tripping tests over temporary objects.
 static void VerifySubstraitRoundtrip(unique_ptr<LogicalOperator> &query_plan, ClientContext &context,
                                      ToSubstraitFunctionData &data, const string &serialized, bool is_json) {
 	// We round-trip the generated json and verify if the result is the same
 	auto con = Connection(*context.db);
 	auto actual_result = con.Query(data.query);
-	shared_ptr<ClientContext> c_ptr(&context, do_nothing);
-	auto sub_relation = SubstraitPlanToDuckDBRel(c_ptr, serialized, is_json);
+	auto con_2 = Connection(*context.db);
+	auto sub_relation = SubstraitPlanToDuckDBRel(con_2.context, serialized, is_json, true);
 	auto substrait_result = sub_relation->Execute();
 	substrait_result->names = actual_result->names;
 	unique_ptr<MaterializedQueryResult> substrait_materialized;

test/python/test_pyarrow.py

@@ -42,4 +42,4 @@ def test_substrait_pyarrow(require):
 
     arrow_result = execute_query(connection, "arrow_integers")
 
-    assert connection.execute("FROM arrow_result").fetchall() == 0
+    assert connection.execute("FROM arrow_result").fetchall() == [(0, 'a'), (1, 'b')]