change some private of coordinator to protected

ddf-project / DDF

Distributed DataFrame: Productivity = Power x Simplicity For Scientists & Engineers, on any Data Engine

http://ddf.io

Apache License 2.0

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Closed PangZhi closed 8 years ago

PangZhi commented 8 years ago

Fix the problem of query fails on some non-named ddf

/cc @Huandao0812 @nhanitvn @mbbui