Luiz questions

• The performance impact of use System.getenv() in java
• Properly handle TIME WITH TIME ZONE in PostgreSQL
• How to add columns to a query without the need to put them in the group by?
• Apache ProxyPass error
• Combine different rows of same table - Postgres
• Return custom exceptions in case of failure with RxJava + Retrofit
• Index for TIMESTAMPTZ and function immutability

Luiz answers