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Apache Pig CONCAT Function

The Apache Pig CONCAT function is used to concatenate two or more expressions. The generated result of expression must have identical types. However, if any sub-expression is null, the generated expression is also null.

Example of CONCAT Function

In this example, we concatenate the first two fields of each tuple.

Steps to execute CONCAT Function

• Create a text file in your local machine and insert the list of tuples.

• Check the tuples inserted in the text files.

• Upload the text files on HDFS in the specific directory.

• Open the pig MapReduce run mode.

• Load the file that contains the data.

• Now, execute and verify the data.

• Let’s return the concatenation of two fields of each tuple.

Here, we got the desired output.