Ignore materialized and alias cols infered during HTTP prepare batch (#1214)

* ignore materialized and alias cols

during instantiation of the batch insert we construct all the columns,
there is no need to do it for materialized and alias columns as they are
non insertable

* fix indent

* add test case

* Update and rename mat_cols_test.go to materialized_column_test.go

---------

Co-authored-by: Kuba Kaflik <kuba.kaflik@clickhouse.com>

Author: iyuroch

conn_http_batch.go

@@ -63,14 +63,19 @@ func (h *httpConnect) prepareBatch(ctx context.Context, query string, opts drive
 	var colNames []string
 	for r.Next() {
 		var (
-			colName string
-			colType string
-			ignore  string
+			colName      string
+			colType      string
+			default_type string
+			ignore       string
 		)
 
-		if err = r.Scan(&colName, &colType, &ignore, &ignore, &ignore, &ignore, &ignore); err != nil {
+		if err = r.Scan(&colName, &colType, &default_type, &ignore, &ignore, &ignore, &ignore); err != nil {
 			return nil, err
 		}
+		// these column types cannot be specified in INSERT queries
+		if default_type == "MATERIALIZED" || default_type == "ALIAS" {
+			continue
+		}
 		colNames = append(colNames, colName)
 		columns[colName] = colType
 	}

tests/std/materialized_column_test.go

@@ -0,0 +1,77 @@
+// 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 std
+
+import (
+	"fmt"
+	"math/big"
+	"strconv"
+	"testing"
+
+	"github.com/ClickHouse/clickhouse-go/v2"
+	clickhouse_tests "github.com/ClickHouse/clickhouse-go/v2/tests"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMaterializedColumnInsert(t *testing.T) {
+	dsns := map[string]clickhouse.Protocol{"Native": clickhouse.Native, "Http": clickhouse.HTTP}
+	useSSL, err := strconv.ParseBool(clickhouse_tests.GetEnv("CLICKHOUSE_USE_SSL", "false"))
+	require.NoError(t, err)
+	for name, protocol := range dsns {
+		t.Run(fmt.Sprintf("%s Protocol", name), func(t *testing.T) {
+			if conn, err := GetStdDSNConnection(protocol, useSSL, nil); assert.NoError(t, err) {
+				if !CheckMinServerVersion(conn, 21, 12, 0) {
+					t.Skip(fmt.Errorf("unsupported clickhouse version"))
+					return
+				}
+				const ddl = `
+		CREATE TABLE test_mat_cols (
+			  Col1 Int128
+			, Col2 MATERIALIZED Col1 * 2
+		) Engine MergeTree() ORDER BY tuple()
+		`
+				defer func() {
+					conn.Exec("DROP TABLE test_mat_cols")
+				}()
+				_, err := conn.Exec(ddl)
+				require.NoError(t, err)
+				scope, err := conn.Begin()
+				require.NoError(t, err)
+				batch, err := scope.Prepare("INSERT INTO test_mat_cols")
+				require.NoError(t, err)
+				var (
+					col1Data = big.NewInt(128)
+					col2Data = big.NewInt(128 * 2)
+				)
+				_, err = batch.Exec(col1Data)
+				require.NoError(t, err)
+				require.NoError(t, scope.Commit())
+				var (
+					col1 big.Int
+					col2 big.Int
+				)
+				require.NoError(t, conn.QueryRow("SELECT * FROM test_mat_cols").Scan(&col1))
+				assert.Equal(t, *col1Data, col1)
+				require.NoError(t, conn.QueryRow("SELECT Col1, Col2 from test_mat_cols").Scan(&col1, &col2))
+				assert.Equal(t, *col1Data, col1)
+				assert.Equal(t, *col2Data, col2)
+			}
+		})
+	}
+}