org
https://greenplum.org/
https://greenplum.org/calc/
https://gp-docs-cn.github.io/docs/
https://greenplum.org/documentation/
https://greenplum.org/docs/570/common/gpdb-features.html
https://github.com/greenplum-db/gpdb
https://github.com/greenplum-db/gpdb/releases
git clone https://github.com/greenplum-db/gpdb.git
git clone https://github.com/greenplum-db/gp-xerces
git clone https://github.com/greenplum-db/gporca
pivotal
https://pivotal.io/
https://pivotal.io/pivotal-greenplum
https://network.pivotal.io/products/pivotal-gpdb
https://gpdb.docs.pivotal.io/570/main/index.html
https://gpdb.docs.pivotal.io/570/main/index.html#serverdocs