Why is ‘a1’ added at the end of sql query in json config file meant for data extraction from NetSuite? Not adding that can cause error?

I am working on extracting data from Netsuite into Databricks File Storage. I am doing it by scripting a json and executing it through Azure Data Factory . This JSON has a part where you specify the query to use when extracting from Netsuite. It is called “incrementalSql”. I see quite often that here, an ‘a1’ is added at the end.