should be it

external/duckdb/test/appender/test_appender_query.cpp

@@ -0,0 +1,111 @@
+
+#include "catch.hpp"
+#include "duckdb/main/appender.hpp"
+#include "test_helpers.hpp"
+
+#include <vector>
+
+using namespace duckdb;
+using namespace std;
+
+TEST_CASE("Test upserting through the query appender", "[appender]") {
+	duckdb::unique_ptr<QueryResult> result;
+	DuckDB db(nullptr);
+	Connection con(db);
+
+	REQUIRE_NO_FAIL(con.Query("CREATE TABLE tbl(i INTEGER PRIMARY KEY, value VARCHAR)"));
+	REQUIRE_NO_FAIL(con.Query("INSERT INTO tbl VALUES (1, 'hello')"));
+
+	duckdb::vector<LogicalType> types;
+	types.push_back(LogicalType::INTEGER);
+	types.push_back(LogicalType::VARCHAR);
+
+	QueryAppender appender(con, "INSERT OR REPLACE INTO tbl FROM appended_data", types);
+	appender.BeginRow();
+	appender.Append<int32_t>(1);
+	appender.Append("world");
+	appender.EndRow();
+
+	appender.BeginRow();
+	appender.Append<int32_t>(2);
+	appender.Append("again");
+	appender.EndRow();
+
+	// this should succeed
+	appender.Flush();
+
+	result = con.Query("SELECT * FROM tbl ORDER BY i");
+	REQUIRE(CHECK_COLUMN(result, 0, {1, 2}));
+	REQUIRE(CHECK_COLUMN(result, 1, {"world", "again"}));
+}
+
+TEST_CASE("Test custom column + table names in the query appender", "[appender]") {
+	duckdb::unique_ptr<QueryResult> result;
+	DuckDB db(nullptr);
+	Connection con(db);
+
+	REQUIRE_NO_FAIL(con.Query("CREATE TABLE tbl(i INTEGER PRIMARY KEY, value VARCHAR)"));
+	REQUIRE_NO_FAIL(con.Query("INSERT INTO tbl VALUES (1, 'hello')"));
+
+	duckdb::vector<LogicalType> types;
+	types.push_back(LogicalType::INTEGER);
+	types.push_back(LogicalType::VARCHAR);
+
+	duckdb::vector<string> column_names;
+	column_names.push_back("i");
+	column_names.push_back("value");
+
+	QueryAppender appender(
+	    con, "MERGE INTO tbl USING my_appended_data USING (i) WHEN MATCHED THEN UPDATE WHEN NOT MATCHED THEN INSERT",
+	    types, column_names, "my_appended_data");
+	appender.BeginRow();
+	appender.Append<int32_t>(1);
+	appender.Append("world");
+	appender.EndRow();
+
+	appender.BeginRow();
+	appender.Append<int32_t>(2);
+	appender.Append("again");
+	appender.EndRow();
+
+	// this should succeed
+	appender.Flush();
+
+	result = con.Query("SELECT * FROM tbl ORDER BY i");
+	REQUIRE(CHECK_COLUMN(result, 0, {1, 2}));
+	REQUIRE(CHECK_COLUMN(result, 1, {"world", "again"}));
+}
+
+TEST_CASE("Test various error conditions of the query appender", "[appender]") {
+	duckdb::unique_ptr<QueryResult> result;
+	DuckDB db(nullptr);
+	Connection con(db);
+
+	REQUIRE_NO_FAIL(con.Query("CREATE TABLE tbl(i INTEGER PRIMARY KEY, value VARCHAR)"));
+	REQUIRE_NO_FAIL(con.Query("INSERT INTO tbl VALUES (1, 'hello')"));
+
+	duckdb::vector<LogicalType> types;
+	types.push_back(LogicalType::INTEGER);
+	types.push_back(LogicalType::VARCHAR);
+
+	SECTION("Unsupported query type") {
+		QueryAppender appender(con, "SELECT * FROM appended_data", types);
+		appender.AppendRow(1, "world");
+		REQUIRE_THROWS(appender.Flush());
+	}
+	SECTION("Multiple queries") {
+		QueryAppender appender(con, "INSERT INTO tbl FROM appended_data; INSERT INTO tbl FROM appended_data;", types);
+		appender.AppendRow(1, "world");
+		REQUIRE_THROWS(appender.Flush());
+	}
+	SECTION("Parser error in query") {
+		QueryAppender appender(con, "INSERT INTO tbl FROM", types);
+		appender.AppendRow(1, "world");
+		REQUIRE_THROWS(appender.Flush());
+	}
+	SECTION("Run-time error in query") {
+		QueryAppender appender(con, "INSERT INTO tbl SELECT col2::INTEGER, col2 FROM appended_data", types);
+		appender.AppendRow(1, "world");
+		REQUIRE_THROWS(appender.Flush());
+	}
+}