Github user paul-rogers commented on the issue:
https://github.com/apache/drill/pull/558
$DRILL_SITE means the site directory. At present, I don't believe we have a
$DRILL_ENV/env directory. The site directory is meant to be a location, outside
of $DRILL_HOME, that contains site-specific files such as configuration, jars
and native libraries.
The scripts handle the "classic" case: the files are in $DRILL_HOME (in
conf, jars/3rdparty, etc.) The scripts should also handle the obscure classic
case in which Drill allows config in /etc/drill. The code in question here
applies only to the case when using a site directory that is not one of the
classic locations.
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