Python实现impala查询客户端

1. 连接Impala服务器

import impala.dbapi as impaladb
from impala.util import as_pandas


# 创建Impala连接
conn = impaladb.connect(
    host='localhost',
    port=21050,
    auth_mechanism='PLAIN'
)

# 创建Impala游标
cur = conn.cursor()

2. 执行查询语句

cur.execute("select * from table_name")

# 获取查询结果
results = cur.fetchall()

3. 将查询结果转换为Pandas DataFrame

df = as_pandas(cur)

完整代码示例：

import impala.dbapi as impaladb
from impala.util import as_pandas


# 创建Impala连接
conn = impaladb.connect(
    host='localhost',
    port=21050,
    auth_mechanism='PLAIN'
)

# 创建Impala游标
cur = conn.cursor()

# 执行查询语句
cur.execute("select * from table_name")

# 获取查询结果
results = cur.fetchall()

# 将查询结果转换为Pandas DataFrame
df = as_pandas(cur)

print(df.head())

注意：需要安装`impala`和`impyla`库。可以使用以下命令进行安装：

pip install impala
pip install impyla