Fix issue in concurrent recreate table

test/api/CMakeLists.txt

@@ -8,6 +8,7 @@ set(TEST_API_OBJECTS
     test_api.cpp
     test_config.cpp
     test_custom_allocator.cpp
+    test_concurrent_recreate.cpp
     test_results.cpp
     test_reset.cpp
     test_get_table_names.cpp

test/api/test_concurrent_recreate.cpp

@@ -0,0 +1,43 @@
+#include "catch.hpp"
+#include "test_helpers.hpp"
+#include <iostream>
+#include <thread>
+
+using namespace duckdb;
+using namespace std;
+
+static void SelectTable(Connection con) {
+    idx_t i = 0;
+    while (true) {
+        auto prepare = con.Prepare("select * from foo");
+        REQUIRE_NO_FAIL(prepare->Execute());
+        std::cout << "select " << i++ << std::endl;
+    }
+}
+
+static void RecreateTable(Connection con) {
+    idx_t i = 0;
+    while (true) {
+        auto prepare = con.Prepare("create or replace table foo as select * from foo");
+        REQUIRE_NO_FAIL(prepare->Execute());
+        std::cout << "recreate " << i++ << std::endl;
+    }
+}
+
+TEST_CASE("Test concurrent prepared", "[api]") {
+    duckdb::unique_ptr<QueryResult> result;
+    DuckDB db(nullptr);
+    Connection con(db);
+    con.EnableQueryVerification();
+
+    REQUIRE_NO_FAIL(con.Query("create table foo as select unnest(generate_series(1, 10));"));
+
+    Connection select_conn(db);
+    Connection recreate_conn(db);
+
+    std::thread select_function(SelectTable, std::move(select_conn));
+    std::thread recreate_function(RecreateTable, std::move(recreate_conn));
+
+    select_function.join();
+    recreate_function.join();
+}