What is the purpose of the log1p function in Databricks SQL and Databricks Runtime?
The log1p function in Databricks SQL and Databricks Runtime is used to calculate the logarithm of 1 plus the given expression (log(1 + expr)). This function is particularly useful when working with small values of expr, as it provides a more accurate result than calculating log(1 + expr) directly. The log1p function returns a DOUBLE data type and returns NULL if the input expression is less than or equal to -1.