Discrepancy in Count Query Results Between Grafana-Plugins and IoTDB CLI

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/iotdb/issues) and found nothing similar.

### Version

- IoTDB 1.2.2 Standalone
- IoTDB Grafana Plugin 1.0 (Grafana interface)
- Grafana 10.2.2

### Describe the bug and provide the minimal reproduce step

### Problem Description
When executing a `SELECT COUNT(DISTINCT())` query, there's an observed inconsistency in the returned count value between Grafana-Plugins and the IoTDB CLI. While the IoTDB CLI returns the expected and accurate count, the Grafana-Plugins display an incorrect count number.

### IoTDB CLI Result (Correct Count)

### Grafana Explore Query (Incorrect Count)

### Steps to Reproduce
1. Execute the `SELECT COUNT(DISTINCT())` query using IoTDB CLI.
2. Execute the same query using Grafana-Plugins within the Grafana Explore interface.
3. Compare the returned count values.

### What did you expect to see?

### Expected Behavior
The count value returned by Grafana-Plugins should align with the count value retrieved using IoTDB CLI for the same `COUNT(DISTINCT())` query.

### What did you see instead?

### Actual Behavior
During the execution of the SELECT COUNT(DISTINCT()) query using Grafana-Plugins, the returned count value deviates from the expected count. Specifically, the count value displayed in Grafana-Plugins is 0, whereas the accurate count obtained through IoTDB CLI is 2.

### Anything else?

The blurried part of the path are just for obscure sensitive data.

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Inizia riproducendo la discrepanza con i passaggi indicati di IoTDB CLI e Grafana Explore usando le versioni elencate, quindi confronta i risultati di COUNT(DISTINCT()). Traccia il modo in cui l’entry point Grafana-Plugins gestisce la risposta alla query; l’issue è conclusa quando Grafana visualizza lo stesso conteggio della CLI: 2 invece di 0.

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