How do computeExpression and computeRelative transformations differ in functionality?

The correct answer highlights the distinct functionalities of computeExpression and computeRelative transformations in data analysis.

computeExpression is designed to create new derived fields based on existing data. This transformation allows users to define custom calculations or metrics that enrich the dataset, such as deriving percentages, ratios, or applying mathematical functions to existing columns. In contrast, computeRelative specifically focuses on analyzing trends by referencing historical data. This transformation lets analysts understand changes over time by calculating relative metrics that emphasize shifts, such as growth rates or year-over-year comparisons.

The differentiation in their purposes is significant. While computeExpression is about enhancement and enrichment of the dataset with new calculations, computeRelative is oriented toward examining historical performance and trends, thereby providing insights into how data evolves over time. This contextual understanding of each transformation's functionality is essential for making informed analytical decisions.