What is the impact of using indexes on frequently filtered columns in Greenplum?

What SQL keyword is used to invoke a MADlib function in Greenplum?

To load data into Greenplum from a directory served by gpfdist, the file path must start with the ___ protocol in the LOCATION clause.

Which of the following are the in-database ML solutions with Greenplum?

An administrator is monitoring Greenplum using GPCC and notices that a specific query has been running for over 30 minutes, consuming high CPU on multiple segments. What is the best next action using GPCC?