implementation of parquet operator

Author: Yin Ye

WORKSPACE

@@ -54,7 +54,6 @@ http_archive(
     sha256 = "14bf9bf97431b890e0ae5dca8f8904841d4883b8596a7108a42f5700ae58d711",
     strip_prefix = "google-cloud-cpp-1.21.0",
     urls = [
-        "https://storage.googleapis.com/mirror.tensorflow.org/github.com/googleapis/google-cloud-cpp/archive/v1.21.0.tar.gz",
         "https://github.com/googleapis/google-cloud-cpp/archive/v1.21.0.tar.gz",
     ],
 )

tensorflow_io/arrow.py

@@ -17,6 +17,7 @@
 @@ArrowDataset
 @@ArrowFeatherDataset
 @@ArrowStreamDataset
+@@ArrowParquetDataset
 @@list_feather_columns
 """
 
@@ -26,13 +27,15 @@
 from tensorflow_io.python.ops.arrow_dataset_ops import ArrowDataset
 from tensorflow_io.python.ops.arrow_dataset_ops import ArrowFeatherDataset
 from tensorflow_io.python.ops.arrow_dataset_ops import ArrowStreamDataset
+from tensorflow_io.python.ops.arrow_dataset_ops import ArrowParquetDataset
 from tensorflow_io.python.ops.arrow_dataset_ops import list_feather_columns
 
 
 _allowed_symbols = [
     "ArrowDataset",
     "ArrowFeatherDataset",
     "ArrowStreamDataset",
+    "ArrowParquetDataset",
     "list_feather_columns",
 ]