Import Calcite as a maven project in Eclipse

[Γιώργος Θεοδωράκης]

Hello, I am trying to import latest version of calcite in eclipse. I have
downloaded the source code from github as zip, used these commands:
$mvn install
$mvn eclipse:eclipse
and finally imported the project as an existing maven project. However, I
get many errors (in core's pom.xml , classes missing) and I don't know what
to do. Any suggestions?