sekikn commented on code in PR #677:
URL: https://github.com/apache/incubator-sedona/pull/677#discussion_r962244668
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common/src/main/java/org/apache/sedona/common/Functions.java:
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@@ -70,6 +70,27 @@ public static double length(Geometry geometry) {
return geometry.getLength();
}
+ public static Double x(Geometry geometry) {
Review Comment:
ST_X, ST_Y and ST_Z should return null if the first argument is not a Point,
so we have to check the input type somewhere. I chose to do that in the common
functions, because if they can direcly return null by using a boxed type, we
can simply wrap it with InferredUnaryExpression in the Spark SQL functions. But
as you pointed out, returning boxed type looks somewhat strange. Should I
change the common functions to return a primitive value? In that case, we have
to use UnaryGeometryExpression instead of InferredUnaryExpression so the code
will become a bit verbose. Either is fine with me.
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