将水线中的Postgres阵列数据类型转换为文本

I need to create an App. We are using PostgreSQL as the underlying DB. The reason we decided on Postgres was because we wanted a relational database due to various entities and their relationships (which did not seem ideal for NoSQL databases like Mongo since there will be multiple joins) and at the same time we wanted to leverage the advantage of array and JSON datatypes of Postgres which is not available in MySQL. I need to create an App. We are using PostgreSQ