```
/4/ :) SELECT arrayJoin([1, 2])  GROUP BY 1 WITH TOTALS FORMAT JSON

{
	"meta":
	[
		{
			"name": "arrayJoin([1, 2])",
			"type": "UInt8"
		}
	],

	"data":
	[
		{
			"arrayJoin([1, 2])": 1
		},
		{
			"arrayJoin([1, 2])": 2
		}← Progress: 0.00 rows, 0.00 B (0.00 rows/s., 0.00 B/s.) Logical error: 'Got 2 in totals chunk, expected 1'.
clickhouse-client: /home/akuzm/ch4/ch/src/Common/Exception.cpp:45: DB::Exception::Exception(const std::string &, int): Assertion `false' failed.
Aborted (core dumped)
```


{
    size_t columns = row_format.format_idx_to_column_idx.size();
    for (size_t j = 0; j < columns; ++j)
    {
        writeString(row_format.delimiters[j], out);
        size_t col_idx = *row_format.format_idx_to_column_idx[j];
        serializeField(*chunk.getColumns()[col_idx], *types[col_idx], row_num, row_format.formats[j]);
    }
    writeString(row_format.delimiters[columns], out);
}
void TemplateBlockOutputFormat::serializeField(const IColumn & column, const IDataType & type, size_t row_num, ColumnFormat col_format)