Remove obsolete Backported classes for jackson 1.5 support #471
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Description
This ancient commit 10 years ago ( b919c17 ) added Backported classes to support jackson 1.5
But the hadoop version was quickly updated back to 1.8.8: 76ca1a7
And the hadoop version in the project are not using 1.5 anymore:
hadoop 3.1.2: jackson 1.9.13
hadoop 2.7.6: jackson 1.9.13
hadoop 2.2.0: jackson 1.8.8
so I think that jackson 1.5 support is no longer imporant.
These hardwired classes make it difficult to bump the jackson version to 1.9.13
Issues Resolved
This PR removes the backported classes and makes it easier to bump the jackson version later.
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