[GitHub] rdblue opened a new pull request #3: Store multiple partition specs in table metadata.

[GitBox <gi...@apache.org>]

rdblue opened a new pull request #3: Store multiple partition specs in table metadata.
URL: https://github.com/apache/incubator-iceberg/pull/3
 
 
   The purpose of this change is to enable future partition spec changes
   and to assign IDs to specs that can be easily encoded in an Avro file
   that tracks a snapshot's manifests.
   
   This updates TableMetadata and the metadata parser to support multiple
   partition specs. This change is forward-compatible for older readers
   because the "partition-spec" field in table metadata is still set to the
   default spec.
   
   Multiple specs are now stored in an array in table metadata called
   "partition-specs". Each entry in the array is an object with two fields,
   a "spec-id" field with an integer ID value, and a "partition-spec"
   field with a partition spec value (an array of partition fields). This
   also adds "default-spec-id" that points to the spec that should be used
   when writing.

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