Postgresql - Internal Array handling - array type or pointer type I have a question, about the internal handling of array columns in Postgres.
Does the engine handle it as a classical array with memory alloc or is it somehow a pointer list.

It would be interesting to know - I have a few questions to answer myself concerning performance... :)
Arrays are defined in src/includes/utils/array.h and src/backend/utils/adt/arrayfuncs.c and the other array* files in src/backend/utils/adt/.

An array is a VARLENA (see src/backend/utils/adt/varlena.c) which is a palloc()'d type, a scoped-storage wrapper around malloc(). Arrays are block-allocated data, not linked lists.