public override IArrowArrayStream GetInfo()

in csharp/src/Drivers/BigQuery/BigQueryConnection.cs [246:360]
105 lines of code
7 McCabe index (conditional complexity)

        public override IArrowArrayStream GetInfo(IReadOnlyList<AdbcInfoCode> codes)
        {
            const int strValTypeID = 0;

            UnionType infoUnionType = new UnionType(
                new Field[]
                {
                    new Field("string_value", StringType.Default, true),
                    new Field("bool_value", BooleanType.Default, true),
                    new Field("int64_value", Int64Type.Default, true),
                    new Field("int32_bitmask", Int32Type.Default, true),
                    new Field(
                        "string_list",
                        new ListType(
                            new Field("item", StringType.Default, true)
                        ),
                        false
                    ),
                    new Field(
                        "int32_to_int32_list_map",
                        new ListType(
                            new Field("entries", new StructType(
                                new Field[]
                                {
                                    new Field("key", Int32Type.Default, false),
                                    new Field("value", Int32Type.Default, true),
                                }
                                ), false)
                        ),
                        true
                    )
                },
                new int[] { 0, 1, 2, 3, 4, 5 }.ToArray(),
                UnionMode.Dense);

            if (codes.Count == 0)
            {
                codes = infoSupportedCodes;
            }

            UInt32Array.Builder infoNameBuilder = new UInt32Array.Builder();
            ArrowBuffer.Builder<byte> typeBuilder = new ArrowBuffer.Builder<byte>();
            ArrowBuffer.Builder<int> offsetBuilder = new ArrowBuffer.Builder<int>();
            StringArray.Builder stringInfoBuilder = new StringArray.Builder();
            int nullCount = 0;
            int arrayLength = codes.Count;

            foreach (AdbcInfoCode code in codes)
            {
                switch (code)
                {
                    case AdbcInfoCode.DriverName:
                        infoNameBuilder.Append((UInt32)code);
                        typeBuilder.Append(strValTypeID);
                        offsetBuilder.Append(stringInfoBuilder.Length);
                        stringInfoBuilder.Append(infoDriverName);
                        break;
                    case AdbcInfoCode.DriverVersion:
                        infoNameBuilder.Append((UInt32)code);
                        typeBuilder.Append(strValTypeID);
                        offsetBuilder.Append(stringInfoBuilder.Length);
                        stringInfoBuilder.Append(infoDriverVersion);
                        break;
                    case AdbcInfoCode.DriverArrowVersion:
                        infoNameBuilder.Append((UInt32)code);
                        typeBuilder.Append(strValTypeID);
                        offsetBuilder.Append(stringInfoBuilder.Length);
                        stringInfoBuilder.Append(infoDriverArrowVersion);
                        break;
                    case AdbcInfoCode.VendorName:
                        infoNameBuilder.Append((UInt32)code);
                        typeBuilder.Append(strValTypeID);
                        offsetBuilder.Append(stringInfoBuilder.Length);
                        stringInfoBuilder.Append(infoVendorName);
                        break;
                    default:
                        infoNameBuilder.Append((UInt32)code);
                        typeBuilder.Append(strValTypeID);
                        offsetBuilder.Append(stringInfoBuilder.Length);
                        stringInfoBuilder.AppendNull();
                        nullCount++;
                        break;
                }
            }

            StructType entryType = new StructType(
                new Field[] {
                    new Field("key", Int32Type.Default, false),
                    new Field("value", Int32Type.Default, true)});

            StructArray entriesDataArray = new StructArray(entryType, 0,
                new[] { new Int32Array.Builder().Build(), new Int32Array.Builder().Build() },
                new ArrowBuffer.BitmapBuilder().Build());

            IArrowArray[] childrenArrays = new IArrowArray[]
            {
                stringInfoBuilder.Build(),
                new BooleanArray.Builder().Build(),
                new Int64Array.Builder().Build(),
                new Int32Array.Builder().Build(),
                new ListArray.Builder(StringType.Default).Build(),
                new List<IArrowArray?>(){ entriesDataArray }.BuildListArrayForType(entryType)
            };

            DenseUnionArray infoValue = new DenseUnionArray(infoUnionType, arrayLength, childrenArrays, typeBuilder.Build(), offsetBuilder.Build(), nullCount);

            IArrowArray[] dataArrays = new IArrowArray[]
            {
                infoNameBuilder.Build(),
                infoValue
            };
            StandardSchemas.GetInfoSchema.Validate(dataArrays);

            return new BigQueryInfoArrowStream(StandardSchemas.GetInfoSchema, dataArrays);
        }