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import ibis
import pandas as pd
import os
# ====== Connection ======
# Connecting to Impala by providing Impala host ip and port (21050 by default) and a Webhdfs client
hdfs = ibis.hdfs_connect(host=os.environ['IP_HDFS'], port=50070)
client = ibis.impala.connect(host=os.environ['IP_IMPALA'], port=21050, hdfs_client=hdfs, user=os.environ['LDAP_USER'], password=os.environ['LDAP_PASSWORD'], auth_mechanism='PLAIN')
# ====== Writing table ======
# Creating a simple pandas DataFrame with two columns
liste_hello = ['hello1','hello2']
liste_world = ['world1','world2']
df = pd.DataFrame(data = {'hello' : liste_hello, 'world': liste_world})
# Writing Dataframe to Impala if table name doesn't exist
db = client.database('default')
if not client.exists_table('helloworld'):
db.create_table('helloworld', df)
t = db['helloworld']
# ====== Reading table ======
# Selecting data with a SQL query
#limit=None to get the whole table, otherwise will only get 10000 first lines
requete = client.sql('select * from helloworld')
df = requete.execute(limit=None)
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