Myeonghyeon Song (Martin)

## What you expected to happen? I want to use Amazon Athena as a datasource, but I couldn't find the target for Athena. I think the issue can be solved...

BigQueryExampleGen uses cached result for the schema during RowToExample

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If the bug is related to a specific library below, please raise an issue in the respective repo directly: [TensorFlow Data Validation Repo](https://github.com/tensorflow/data-validation/issues) [TensorFlow Model Analysis Repo](https://github.com/tensorflow/model-analysis/issues) [TensorFlow Transform Repo](https://github.com/tensorflow/transform/issues)...

Hello, I found a problem when running tfgnn_graph_sampler with graph having latent node (only id without any feature). The error message was `AttributeError: 'list' object has no attribute 'get'` when...