pg_attribute_encoding

The pg_attribute_encoding system catalog table in the pg_catalog schema contains column storage information.

column	type	modifers	storage	description
`attrelid`	oid	not null	plain	Foreign key to `pg_attribute.attrelid`
`attnum`	smallint	not null	plain	Foreign key to `pg_attribute.attnum`
`filenum`	smallint	not null	plain	The column file number
`attoptions`	text [ ]		extended	The options

For a column with filenum = f, the column files on disk use the suffix (f - 1)*128 to f*128 - 1. For example:

Column with filenum = 1 has files relfilenode, relfilenode.1 .. relfilenode.127.
Column with filenum = 2 has files relfilenode.128, relfilenode.129 .. relfilenode.255.
Column with filenum = 3 has files relfilenode.256, relfilenode.257 .. relfilenode.383.

Support

Resources

Contribution

Working with Git & GitHub

Contribution Overview

Code Contribution

Doc Contribution

Apache Cloudberry is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.

Apache®, the names of Apache projects, and the feather logo are either registered trademarks or trademarks of the Apache Software Foundation in the United States and/or other countries.