pitrou commented on code in PR #585:
URL: https://github.com/apache/parquet-format/pull/585#discussion_r3549523308
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src/main/thrift/parquet.thrift:
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@@ -468,6 +468,21 @@ struct GeographyType {
2: optional EdgeInterpolationAlgorithm algorithm;
}
+/**
+ * File logical type annotation
+ *
+ * Annotates a group that represents a reference to an external file.
+ * The group must contain the following fields identified by name:
+ * - path (STRING, required): an opaque string path to the file (e.g.
s3://bucket/file.jpg)
Review Comment:
To answer the "it can be left to engines" argument: this is fine for closed
environments where the Parquet file never leaves some company cloud of sorts
(and even there, several Parquet implementations may be involved).
But Parquet files are a widespread way of publishing and sharing columnar
data. If FILE columns cannot be interpreted unambiguously, then ingesting a
Parquet file needs additional hands-holding from the user.
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