Github user StevenMPhillips commented on the pull request: https://github.com/apache/drill/pull/373#issuecomment-182692303 There are two main changes made in this commit: 1. Removed SchemaPath from MaterializedField. Now, a MaterializedField contains a name (String), and a list of children (MaterializedField). Each MaterializedField instance knows its own name, but has no knowledge of its parents. While making this change, I also got rid of MaterializedField.Key, and made sure that MaterializedField was not used as a Map key anywhere in the code. 2. TransferPair no longer takes a FieldReference, but instead will take a String for the field name. With those two changes, I was able to remove the dependency on drill-logical. The rest of the changes in the patch are simply making the rest of the code conform to this new interface. I should not that this will break external StoragePlugins. They will need to be modified and recompiled.
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