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Replacing feature name with feature path in statistics proto #73

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@paulgc

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@paulgc

Towards the goal of adding support for computing statistics over structured data (e.g., arbitrary protocol buffers, parquet data), we will populate path for each feature instead of name in the output statistics proto. Path contains a repeated string field step.

Current behavior

features {
  name: 'foo'
}

New behavior

features {
  path {
    step: 'foo'
  }
}

TFDV 0.14 will have this new behavior. The validation API will be backwards compatible with the protos with name populated.

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