You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 751_test.go
    path of file: ./repos/clickhouse-go/tests/issues
    
    the code of the file until where you have to start completion: // Licensed to ClickHouse, Inc. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. ClickHouse, Inc. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package issues

import (
	"context"
	"database/sql"
	clickhouse_tests "github.com/ClickHouse/clickhouse-go/v2/tests"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"testing"
)

func Test
    
func TestIssue751(t *testing.T) {
	conn, err := clickhouse_tests.GetConnection("issues", nil, nil, nil)
	require.NoError(t, err)
	ctx := context.Background()
	conn.Exec(ctx, "DROP TABLE IF EXISTS issue_751")

	require.NoError(t, conn.Exec(ctx, `
		CREATE TABLE issue_751 (
				Col1 Nullable(String),
				Col2 String,
				Col3 Nullable(Int8),
				Col4 Nullable(Int64),
				Col5 LowCardinality(Nullable(String))
			)
			Engine MergeTree() ORDER BY tuple()
		`))
	defer func() {
		conn.Exec(ctx, "DROP TABLE issue_751")
	}()
	type Example struct {
		Col1 *string
		Col2 string
		Col3 *int8
		Col4 *int64
		Col5 *string
	}
	batch, err := conn.PrepareBatch(ctx, "INSERT INTO issue_751")
	require.NoError(t, err)
	example := Example{}
	require.NoError(t, batch.AppendStruct(&example))
	batch.Append(example.Col1, example.Col2, example.Col3, example.Col4, example.Col5)
	require.NoError(t, batch.Send())

	rows, err := conn.Query(ctx, "SELECT * FROM issue_751")
	require.NoError(t, err)
	c := 0
	for rows.Next() {
		var (
			col1 *string
			col2 string
			col3 *int8
			col4 sql.NullInt64
			col5 *string
		)
		require.NoError(t, rows.Scan(&col1, &col2, &col3, &col4, &col5))
		assert.Nil(t, col1)
		assert.Equal(t, "", col2)
		assert.Nil(t, col3)
		assert.Equal(t, sql.NullInt64{
			Int64: 0,
			Valid: false,
		}, col4)
		assert.Nil(t, col5)
		c++
	}
	assert.Equal(t, 2, c)
}