Which function is used to predict future values on a line chart in SAQL?

The function used to predict future values on a line chart in SAQL is the timeseries() function. This function is specifically designed to handle time-based data, allowing analysts to create forecasts based on historical trends. By utilizing this function, one can analyze time series data and generate predictions that accommodate seasonality, trends, and other temporal patterns.

When using the timeseries() function, you can define parameters to forecast future points, making it particularly useful for applications like predicting sales, web traffic, or any data that follows a time-based pattern. This capability makes it an essential tool in analytics for deriving insights and making informed decisions based on historical data trends.

The other options, while related to analyzing data, do not perform the specific function of forecasting future values in the way that timeseries() does. Hence, understanding the unique purpose of timeseries() clarifies its role in predictive analytics within the context of SAQL.