Merge pull request #408 from s22s/fix/407

Added forced truncation of WKT types in Markdown/HTML rendering.

Author: metasim

core/src/main/scala/org/locationtech/rasterframes/util/DataFrameRenderers.scala

@@ -24,12 +24,14 @@ package org.locationtech.rasterframes.util
 import geotrellis.raster.render.ColorRamps
 import org.apache.spark.sql.Dataset
 import org.apache.spark.sql.functions.{base64, concat, concat_ws, length, lit, substring, when}
+import org.apache.spark.sql.jts.JTSTypes
 import org.apache.spark.sql.types.{StringType, StructField}
 import org.locationtech.rasterframes.expressions.DynamicExtractors
 import org.locationtech.rasterframes.{rfConfig, rf_render_png, rf_resample}
+import org.apache.spark.sql.rf.WithTypeConformity
 
 /**
-  * DataFrame extensiosn for rendering sample content in a number of ways
+  * DataFrame extension for rendering sample content in a number of ways
   */
 trait DataFrameRenderers {
   private val truncateWidth = rfConfig.getInt("max-truncate-row-element-length")
@@ -47,8 +49,9 @@ trait DataFrameRenderers {
               lit("\"></img>")
             )
           else {
+            val isGeom = WithTypeConformity(c.dataType).conformsTo(JTSTypes.GeometryTypeInstance)
             val str = resolved.cast(StringType)
-            if (truncate)
+            if (truncate || isGeom)
               when(length(str) > lit(truncateWidth),
                 concat(substring(str, 1, truncateWidth), lit("..."))
               )

core/src/test/scala/org/locationtech/rasterframes/ExtensionMethodSpec.scala

@@ -39,7 +39,7 @@ import scala.xml.parsing.XhtmlParser
 class ExtensionMethodSpec extends TestEnvironment with TestData with SubdivideSupport {
   lazy val rf = sampleTileLayerRDD.toLayer
 
-  describe("DataFrame exention methods") {
+  describe("DataFrame extension methods") {
     it("should maintain original type") {
       val df = rf.withPrefixedColumnNames("_foo_")
       "val rf2: RasterFrameLayer = df" should compile
@@ -49,7 +49,7 @@ class ExtensionMethodSpec extends TestEnvironment with TestData with SubdivideSu
       "val Some(col) = df.spatialKeyColumn" should compile
     }
   }
-  describe("RasterFrameLayer exention methods") {
+  describe("RasterFrameLayer extension methods") {
     it("should provide spatial key column") {
       noException should be thrownBy {
         rf.spatialKeyColumn
@@ -124,6 +124,10 @@ class ExtensionMethodSpec extends TestEnvironment with TestData with SubdivideSu
 
       val md3 = rf.toMarkdown(truncate=true, renderTiles = false)
       md3 shouldNot include("<img")
+
+      // Should truncate JTS types even when we don't ask for it.
+      val md4 = rf.withGeometry().select("geometry").toMarkdown(truncate = false)
+      md4 should include ("...")
     }
 
     it("should render HTML") {