How to execute an R function in a HANA database using SQL?

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To execute an R function in a HANA database using SQL, you need to follow these steps:

1. Ensure that the HANA database has the R server installed and configured.

2. Create an R script that contains the function you want to execute. Save the script with a .r extension.

3. Load the R script into the HANA database using the FILE_PUT function. For example:

FILE_PUT('my_script.r', '/usr/sap/HDB/home/my_script.r');

This will upload the R script to the HANA database server.

1. Create a stored procedure in HANA that executes the R function. For example:

CREATE PROCEDURE my_r_function()
LANGUAGE RLANG AS
BEGIN
    result <- my_r_function_in_file('/usr/sap/HDB/home/my_script.r');
END;

This stored procedure calls the function specified in the R script 'my_script.r', and stores the result in the variable 'result'.

1. Finally, you can call the stored procedure using a SQL query. For example:

CALL my_r_function();

This will execute the R function in the HANA database and return the result.