pitrou commented on code in PR #451:
URL: https://github.com/apache/parquet-format/pull/451#discussion_r1773624558
##########
src/main/thrift/parquet.thrift:
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@@ -288,6 +288,27 @@ struct Statistics {
8: optional bool is_min_value_exact;
}
+/**
+ * An extension type description
+ *
+ * Extension types allow for third-party semantics not provided by the core
+ * Parquet type system.
+ *
+ * `name` is a dotted name reliably identifying the extension type.
+ * Names beginning with "parquet." are reserved for standardization within
+ * the Parquet project.
+ *
+ * If the extension type is parametric, then `serialization` is an encoding
+ * of the extension type's parameters. It is recommended (but not required)
+ * that the parameters are serialized as a JSON object in UTF-8 encoding.
+ *
+ * If the extension type is not parametric, then `serialization` is empty.
+ */
+struct ExtensionTypeDescription {
Review Comment:
Or are you thinking about extension-specific parameter keys as in
https://arrow.apache.org/docs/dev/format/CanonicalExtensions.html ?
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