Nested tables support

If I have simple table like this:

CREATE TABLE test.nested
(
`account` UInt64,
`Orders` Nested(
id UInt64,
order_id String)
)
ENGINE = MergeTree
ORDER BY account

account │ UInt64
Orders.id │ Array(UInt64)
Orders.order_id │ Array(String)

How I can insert data into this table using clickhouse-cpp API? I’m working with Orders.id and Orders.order_id columns as arrays but when method block.AppendColumn called, I’m getting exception:
all columns in block must have same count of rows.

Is there any existing workaround or plans to extend API for nested tables support?

The issue names no repository files or tests; start with the clickhouse-cpp API and reproduce the failure at Block.AppendColumn using the shown Nested table. Determine whether nested columns are supported and clarify the intended insertion API or workaround. Done requires an agreed scope for Nested table support, with documentation or tests covering the result.

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