hive_create_table_with_many_partitions.py

# -*- coding: utf-8 -*-
"""
   Copyright 2015 Sho Shimauchi

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.


    hive_create_table_with_many_partitions.py
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Generate HQL to create table with many partitions.

    usage: create_table_with_many_partitions.py [-n <num of partitions>] [-t <table name>] > [output.txt]

    sample output:
    CREATE TABLE IF NOT EXISTS test_table (id INT, name STRING) PARTITIONED BY (pid INT);
    ALTER TABLE test_table ADD IF NOT EXISTS
    PARTITION (pid = 1) PARTITION (pid = 2) ... ;

"""

import argparse


def parse_args():
    """ Parse and return command line args """

    parser = argparse.ArgumentParser()
    parser.add_argument("-n", "--num_partitions", required=False, type=int, default=10)
    parser.add_argument("-t", "--table_name", required=False, default="test_table")
    return parser.parse_args()


def generate_hql(table_name="test_table", num_partitions=10):

    s_create_table = "CREATE TABLE IF NOT EXISTS {0} (id INT, name STRING) PARTITIONED BY (pid INT);".format(table_name)
    s_add_partitions_1 = "ALTER TABLE {0} ADD IF NOT EXISTS ".format(table_name)
    l_partitions = []

    for i in range(num_partitions):
        l_partitions.append("PARTITION (pid = {0})".format(str(i)))

    hql = s_create_table + s_add_partitions_1 + ' '.join(l_partitions) + ';'
    return hql


if __name__ == '__main__':
    args = parse_args()

    print(generate_hql(table_name=args.table_name,
                       num_partitions=args.num_partitions
                       )
          )