Last active
September 9, 2019 18:41
-
-
Save serenamm/c88852815e64154f1df3d066e8bffce5 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import pyspark | |
| from pyspark.sql import SparkSession | |
| create_table_query = ''' | |
| SELECT | |
| item_id_1, | |
| item_id_2 | |
| FROM ( | |
| SELECT | |
| item_id_1, | |
| item_id_2, | |
| ROW_NUMBER() OVER(PARTITION BY item_id_1 ORDER BY similarity_score DESC) as row_num | |
| FROM {similarity_table} s | |
| {same_category_q} | |
| ) | |
| WHERE row_num <= {num_items} | |
| ''' | |
| def create_new_table(spark, table_paths, params, from_date, to_date, same_category_q): | |
| similarity_table = table_paths["product_similarity"]["table"] | |
| created_table = spark.sql(create_table_query.format(similarity_table=similarity_table, | |
| same_category_q=same_category_q, | |
| num_items=params["num_items"])) | |
| # Write table to some path | |
| created_table.coalesce(1).write.save(table_paths["created_table"]["path"], | |
| format="orc", mode="Overwrite") | |
| def make_query(same_category, table_paths): | |
| if same_category is True: | |
| same_category_q = ''' | |
| INNER JOIN {product_table} p | |
| ON s.item_id_1 = p.item_id | |
| INNER JOIN {product_table} q | |
| ON s.item_id_2 = q.item_id | |
| WHERE item_id_1 != item_id_2 | |
| AND p.category_id = q.category_id | |
| '''.format(product_table=table_paths["product_table"]["table"]) | |
| else: | |
| same_category_q = '' | |
| return same_category_q | |
| if __name__ == "__main__": | |
| spark = (SparkSession | |
| .builder | |
| .appName("testing_tutorial") | |
| .enableHiveSupport() | |
| .getOrCreate()) | |
| same_category = True # or False | |
| table_paths = foo # Assume paths are in some JSON | |
| params = bar | |
| same_category_q, target_join_q = make_query(same_category, table_paths) | |
| create_new_table(spark, table_paths, params, same_category_q) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment