jiayuasu commented on code in PR #240:
URL: https://github.com/apache/parquet-format/pull/240#discussion_r1699463033
##########
src/main/thrift/parquet.thrift:
##########
@@ -373,6 +453,51 @@ struct JsonType {
struct BsonType {
}
+/**
+ * Physical type and encoding for the geometry type.
+ */
+enum GeometryEncoding {
+ /**
+ * Allowed for physical type: BYTE_ARRAY.
+ *
+ * Well-known binary (WKB) representations of geometries. It supports 2D or
+ * 3D geometries of the standard geometry types (Point, LineString, Polygon,
+ * MultiPoint, MultiLineString, MultiPolygon, and GeometryCollection). This
+ * is the preferred option for maximum portability.
+ *
+ * This encoding enables GeometryStatistics to be set in the column chunk
+ * and page index.
+ */
+ WKB = 0;
+
+ // TODO: add native encoding from GeoParquet/GeoArrow
+}
+
+/**
+ * Geometry logical type annotation (added in 2.11.0)
+ */
+struct GeometryType {
+ /**
+ * Physical type and encoding for the geometry type. Please refer to the
+ * definition of GeometryEncoding for more detail.
+ */
+ 1: required GeometryEncoding encoding;
+ /**
+ * Edges of polygon.
+ */
+ 2: required Edges edges;
+ /**
+ * Coordinate Reference System, i.e. mapping of how coordinates refer to
+ * precise locations on earth, e.g. OGC:CRS84
+ */
+ 3: optional string crs;
Review Comment:
@wgtmac According to the feedback from the Iceberg thread, I suggest we also
add a string field namely `crs_kind` in addition to the `crs` field. The only
allowed value currently is `PROJJSON`. In the future, if there is a new OGC
standard called `CRSJSON` that differs from `PROJJSON`, we will allow another
value `CRSJSON`.
For WKT2 2019 <-> PROJJSON, we will implement a Java version of this library
https://github.com/rouault/projjson_to_wkt so whoever wants to use WKT2 2019
CRS can use it to get it from the projjson string.
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