True ETL Tools
If you need more than just to copy data from Segment to Amazon Redshift, you may use Skyvia's powerful ETL functionality for Segment and Amazon Redshift integration. Skyvia's Import tool will correctly extract Segment data, transform it, and load to Amazon Redshift when Amazon Redshift tables have different structure than Segment objects. Besides, if you ever need to load data back from Amazon Redshift to Segment, Skyvia Import allows loading data in any direction, supporting Reverse ETL scenario.
For more complex cases, you can use Data Flow and Control Flow tools. They are designer-based solutions for creating complex data pipelines, involving not only Segment and Amazon Redshift connectors, but any number of connectors in one integration. With these tools you can automate data workflows, involving custom logic, complex multistage transformations, combine data from different sources, load them into multiple destinations at once and many more.