How to load data from Parquet File to Firebolt

Begin by installing the necessary tools on your local machine. You'll need Python (preferably version 3.7 or later) and the `pyarrow` library to read Parquet files, and the `firebolt-sdk` to interact with Firebolt. You can install these using pip:
```
pip install pyarrow firebolt-sdk
```

Set up and configure your connection to Firebolt. You'll need your Firebolt account credentials and the database name. Create a configuration file or set environment variables to store these securely:
```python
from firebolt.sdk import Client

client = Client(username='', password='')
connection = client.connect(database='')
```

Use `pyarrow` to read the contents of your Parquet file into a Pandas DataFrame. This allows for easy manipulation and preparation of the data:
```python
import pyarrow.parquet as pq
import pandas as pd

parquet_file = 'path/to/your/file.parquet'
table = pq.read_table(parquet_file)
df = table.to_pandas()
```

Convert the DataFrame to a list of tuples, which is a format that can be easily used for data insertion into Firebolt. Ensure that the column order matches the table schema in Firebolt:
```python
data = [tuple(x) for x in df.to_numpy()]
columns = ', '.join(df.columns)
```

If the target table does not already exist in Firebolt, you need to create it. Use the column names and types from the DataFrame to define your schema:
```python
create_table_query = f"""
CREATE TABLE IF NOT EXISTS your_table_name (
column1_name column1_type,
column2_name column2_type,
...
)
"""
connection.execute(create_table_query)
```

Insert the data into the Firebolt table. Use a parameterized query to safely insert data and avoid SQL injection:
```python
insert_query = f"INSERT INTO your_table_name ({columns}) VALUES (?, ?, ...)"
connection.executemany(insert_query, data)
```

After insertion, verify that the data has been correctly transferred by executing a simple query to check the row count or specific data checks:
```python
result = connection.execute("SELECT COUNT(*) FROM your_table_name")
print("Number of rows inserted:", result.fetchone()[0])
```

By following these steps, you can successfully move data from a Parquet file to Firebolt without relying on third-party connectors or integrations.