In Hive, how to compare array of string with hivevar list?

Apache Hive

Introduction:

Apache Hive is a data warehousing tool built on top of Hadoop for managing and querying large datasets stored in the Hadoop Distributed File System (HDFS) or other storage systems such as Apache HBase and Amazon S3. It provides an SQL-like interface called HiveQL for querying and manipulating data, as well as a mechanism for storing metadata about the data and the structure of the tables and partitions. Hive is designed to work with large datasets and can handle batch processing of data, as well as ad-hoc queries. Hive also includes support for user-defined functions (UDFs) and user-defined aggregate functions (UDAFs) to enable custom processing of data. It can be used in combination with other big data processing frameworks such as Apache Pig, Apache Spark, and Apache Storm.

In Hive, you can use the array_contains() function to check if an array contains a specific value. You can also use the IN clause in a Hive query to check if a value is present in a list of values. Here’s an example of how you can use these functions to compare an array of strings with a Hive variable list:

SET hivevar:list_of_values = "value1,value2,value3";

SELECT * FROM my_table
WHERE array_contains(my_array_col, "value1") OR my_string_col IN (${hivevar:list_of_values});

This query will return all rows from “my_table” where “my_array_col” contains “value1” or where “my_string_col” is present in the list of values stored in the “list_of_values” Hive variable.

You can also use the ARRAY function to convert the list of values into an array and use the array_intersect function to check the intersection of two arrays

SET hivevar:list_of_values = "value1,value2,value3";
SELECT * FROM my_table
WHERE array_intersect(my_array_col, array(${hivevar:list_of_values})) is not null;

This query will return all rows from “my_table” where “my_array_col” contains any of the values in the list of values stored in the “list_of_values” Hive variable.