wgtmac commented on code in PR #240:
URL: https://github.com/apache/parquet-format/pull/240#discussion_r1618187539
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src/main/thrift/parquet.thrift:
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@@ -237,6 +237,38 @@ struct SizeStatistics {
3: optional list<i64> definition_level_histogram;
}
+/**
+ * Bounding box of geometries in the representation of min/max value pair of
+ * coordinates from each axis. Values of Z and M are omitted for 2D geometries.
+ */
+struct BoundingBox {
+ 1: optional double x_min;
+ 2: optional double x_max;
+ 3: optional double y_min;
+ 4: optional double y_max;
+ 5: optional double z_min;
+ 6: optional double z_max;
+ 7: optional double m_min;
+ 8: optional double m_max;
+}
+
+/** Statistics specific to GEOMETRY logical type */
+struct GeometryStatistics {
+ /** Bounding box of geometries */
+ 1: optional BoundingBox bbox;
+ /** Covering of geometries as a list of Google S2 cell ids */
+ 2: list<i64> s2_cell_ids;
+ /** Covering of geometries as a list of Uber H3 indices */
+ 3: list<i64> h3_indices;
+ /**
+ * The geometry types of all geometries, or an empty array if they are not
+ * known. It follows the same rule of `geometry_types` column metadata of
+ * GeoParquet. Accepted geometry types are: "Point", "LineString", "Polygon",
+ * "MultiPoint", "MultiLineString", "MultiPolygon", "GeometryCollection".
Review Comment:
The basic idea is for GeoParquet compliance. `geometry_types` is kind of
statistics based on actual data and not suitable to be put into static metadata
field of the logical type.
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