In the JDBC query result set, columns of type AggregateFunction cannot be parsed normally

## Description

When creating a materialized view, specify the Select statement as follows:

```sql
SELECT
toDate(timestamp) AS date,
countState(*) AS count,
quantileState(0.9)(duration) AS tp90_duration_ms,
quantileState(0.99)(duration) AS tp99_duration_ms,
avgState(duration) AS avg_duration_ms,
maxState(duration) AS max_duration_ms,
minState(duration) AS min_duration_ms
FROM test.test_table_local
GROUP BY
date
```
This statement is queried directly with JDBC, and the final error is:
java.sql.SQLException: Failed to read value for column count

final debug result：

1. BinaryStreamReader.java -> readValue method

case AggregateFunction:
return (T)this.readBitmap(actualColumn);
2. readBitmap method
```java
private ClickHouseBitmap readBitmap(ClickHouseColumn column) throws IOException {
return ClickHouseBitmap.deserialize(this.input, ((ClickHouseColumn)column.getNestedColumns().get(0)).getDataType());
}
```
column.getNestedColumns() is empty

3.

### Error Log or Exception StackTrace

```
This statement is queried directly with JDBC, and the final error is:
java.sql.SQLException: Failed to read value for column count
```

### Expected Behaviour

### Code Example

```java

```

### Configuration

#### Client Configuration
```java

```

#### Environment
* [ ] Cloud
* Client version: 0.9.4
* Language version: 1.8
* OS: mac

#### ClickHouse Server
* ClickHouse Server version: 25.5.1

Start with BinaryStreamReader.java, especially readValue and readBitmap, and reproduce the materialized-view query using ClickHouse Java client 0.9.4 against ClickHouse 25.5.1. Inspect why AggregateFunction has no nested columns; done means JDBC can read the aggregate result columns without the SQLException.

Scritto dal modello di indicizzazione a partire dal testo della issue.