fix crs equals checks

Author: AndreiKingsley

dataframe-geo/src/main/kotlin/org/jetbrains/kotlinx/dataframe/geo/GeoDataFrame.kt

@@ -36,6 +36,9 @@ class GeoDataFrame<T : WithGeometry>(val df: DataFrame<T>, val crs: CoordinateRe
      * @return A new `GeoDataFrame` with reprojected geometries and the specified CRS.
      */
     fun applyCrs(targetCrs: CoordinateReferenceSystem): GeoDataFrame<T> {
+        if (crs == null) {
+            return GeoDataFrame(df, targetCrs)
+        }
         if (targetCrs == this.crs) return this
         // Use WGS 84 by default TODO
         val sourceCRS: CoordinateReferenceSystem = this.crs ?: DEFAULT_CRS
@@ -47,8 +50,14 @@ class GeoDataFrame<T : WithGeometry>(val df: DataFrame<T>, val crs: CoordinateRe
     }
 
     override fun equals(other: Any?): Boolean {
+        if (this === other) return true
         if (other !is GeoDataFrame<*>) return false
-        return df == other.df && crs == other.crs
+
+        return df == other.df && when {
+            crs == null && other.crs == null -> true
+            crs == null || other.crs == null -> false
+            else -> CRS.equalsIgnoreMetadata(crs, other.crs)
+        }
     }
 
     companion object {

dataframe-geo/src/test/kotlin/org/jetbrains/kotlinx/dataframe/geo/io/IOTest.kt

@@ -21,7 +21,7 @@ class IOTest {
             "Point 2", point2
         )
     }
-    private val simplePointsGeoDf = simplePointsDf.toGeo(null)
+    private val simplePointsGeoDf = simplePointsDf.toGeo(GeoDataFrame.DEFAULT_CRS)
     private val classLoader = (this::class as Any).javaClass.classLoader
 
     @Test
@@ -61,7 +61,6 @@ class IOTest {
         simplePointsGeoDf.writeShapefile(tempShapefileDir)
         val shapefile = File("${tempShapefileDir.path}/simple_points.shp")
         assertEquals(simplePointsGeoDf, GeoDataFrame.readShapefile(shapefile.toURI().toURL()))
-
         tempDir.deleteOnExit()
     }
 }