szehon-ho commented on code in PR #240:
URL: https://github.com/apache/parquet-format/pull/240#discussion_r1766100893
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src/main/thrift/parquet.thrift:
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@@ -237,6 +237,98 @@ struct SizeStatistics {
3: optional list<i64> definition_level_histogram;
}
+/**
+ * Interpretation for edges of GEOMETRY logical type, i.e. whether the edge
+ * between points represent a straight cartesian line or the shortest line on
+ * the sphere. It applies to all non-point geometry objects.
+ */
+enum Edges {
+ PLANAR = 0;
+ SPHERICAL = 1;
+}
+
+/**
+ * A custom binary-encoded polygon or multi-polygon to represent a covering of
+ * geometries. For example, it may be a bounding box or an envelope of
geometries
+ * when a bounding box cannot be built (e.g. a geometry has spherical edges,
or if
+ * an edge of geographic coordinates crosses the antimeridian). In addition,
it can
+ * also be used to provide vendor-agnostic coverings like S2 or H3 grids.
+ */
+struct Covering {
+ /**
+ * A type of covering. Currently accepted values: "WKB".
+ */
+ 1: required string kind;
+ /**
+ * A payload specific to kind. Below are the supported values:
+ * - WKB: well-known binary of a POLYGON or MULTI-POLYGON that completely
+ * covers the contents. This will be interpreted according to the same CRS
+ * and edges defined by the logical type.
+ */
+ 2: required binary value;
+}
+
+/**
+ * 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.
+ * Filter pushdown on geometries are only safe for planar spatial predicate
+ * but it is recommended that the writer always generates bounding box
statistics,
+ * regardless of whether the geometries are planar or spherical.
+ */
+struct BoundingBox {
Review Comment:
> The bounding box statistics will be always calculated by getting the
min/max of X and Y values. For cartesian geometries, this is not a problem at
all because there is no antimeridian and orientation issue at all in this case.
> For spherical geometries, this is a problem so that's why the spec says
that it is not safe to use it for spherical geometries.
FYI @dmitrykoval . We were discussing earlier that some engine still have a
way to use bounding box even for spherical edges (there's ways to convert?)
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