Evaluated removal of FixedDelegationTile, created (ignored) test

to verify behavior, and filed locationtech/geotrellis#3153.

build.sbt

@@ -90,11 +90,9 @@ lazy val pyrasterframes = project
       spark("core").value % Provided,
       spark("mllib").value % Provided,
       spark("sql").value % Provided
-    ),
-    Test / test := (Test / test).dependsOn(experimental / Test / test).value
+    )
   )
 
-
 lazy val datasource = project
   .configs(IntegrationTest)
   .settings(Defaults.itSettings)
@@ -107,7 +105,6 @@ lazy val datasource = project
       spark("mllib").value % Provided,
       spark("sql").value % Provided
     ),
-    Test / test := (Test / test).dependsOn(core / Test / test).value,
     initialCommands in console := (initialCommands in console).value +
       """
         |import org.locationtech.rasterframes.datasource.geotrellis._
@@ -129,8 +126,7 @@ lazy val experimental = project
       spark("sql").value % Provided
     ),
     fork in IntegrationTest := true,
-    javaOptions in IntegrationTest := Seq("-Xmx2G"),
-    Test / test := (Test / test).dependsOn(datasource / Test / test).value
+    javaOptions in IntegrationTest := Seq("-Xmx2G")
   )
 
 lazy val docs = project
@@ -171,8 +167,6 @@ lazy val docs = project
     addMappingsToSiteDir(Compile / paradox / mappings, paradox / siteSubdirName)
   )
 
-//ParadoxMaterialThemePlugin.paradoxMaterialThemeSettings(Paradox)
-
 lazy val bench = project
   .dependsOn(core % "compile->test")
   .settings(publish / skip := true)

core/src/main/scala/org/locationtech/rasterframes/tiles/FixedDelegatingTile.scala

@@ -24,6 +24,7 @@ import geotrellis.raster.{ArrayTile, DelegatingTile, Tile}
 
 /**
  * Workaround for case where `combine` is invoked on two delegating tiles.
+ * Remove after https://github.com/locationtech/geotrellis/issues/3153 is fixed and integrated
  * @since 8/22/18
  */
 abstract class FixedDelegatingTile extends DelegatingTile {

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

@@ -22,12 +22,13 @@
 package org.locationtech.rasterframes
 
 import geotrellis.raster._
-import geotrellis.raster.mapalgebra.local.{Max, Min}
+import geotrellis.raster.mapalgebra.local.{Add, Max, Min}
 import geotrellis.spark._
 import org.apache.spark.sql.Column
 import org.apache.spark.sql.functions._
 import org.locationtech.rasterframes.TestData.randomTile
 import org.locationtech.rasterframes.stats.CellHistogram
+import org.locationtech.rasterframes.util.DataBiasedOp.BiasedAdd
 
 /**
  * Test rig associated with computing statistics and other descriptive
@@ -318,6 +319,56 @@ class TileStatsSpec extends TestEnvironment with TestData {
       val ndCount2 = ndTiles.select("*").where(rf_is_no_data_tile($"tiles")).count()
       ndCount2 should be(count + 1)
     }
+
+    // Awaiting https://github.com/locationtech/geotrellis/issues/3153 to be fixed and integrated
+    ignore("should allow NoData algebra to be changed via delegating tile") {
+      val t1 = ArrayTile(Array.fill(4)(1), 2, 2)
+      val t2 = {
+        val d = Array.fill(4)(2)
+        d(1) = geotrellis.raster.NODATA
+        ArrayTile(d, 2, 2)
+      }
+
+      val d1 = new DelegatingTile {
+        override def delegate: Tile = t1
+      }
+      val d2 = new DelegatingTile {
+        override def delegate: Tile = t2
+      }
+
+      /** Counts the number of non-NoData cells in a tile */
+      case object CountData {
+        def apply(t: Tile) = {
+          var count: Long = 0
+          t.dualForeach(
+            z ⇒ if(isData(z)) count = count + 1
+          ) (
+            z ⇒ if(isData(z)) count = count + 1
+          )
+          count
+        }
+      }
+
+      // Confirm counts
+      CountData(t1) should be (4L)
+      CountData(t2) should be (3L)
+      CountData(d1) should be (4L)
+      CountData(d2) should be (3L)
+
+      // Standard Add evaluates `x + NoData` as `NoData`
+      CountData(Add(t1, t2)) should be (3L)
+      CountData(Add(d1, d2)) should be (3L)
+      // Is commutative
+      CountData(Add(t2, t1)) should be (3L)
+      CountData(Add(d2, d1)) should be (3L)
+
+      // With BiasedAdd, all cells should be data cells
+      CountData(BiasedAdd(t1, t2)) should be (4L) // <-- passes
+      CountData(BiasedAdd(d1, d2)) should be (4L) // <-- fails
+      // Should be commutative.
+      CountData(BiasedAdd(t2, t1)) should be (4L) // <-- passes
+      CountData(BiasedAdd(d2, d1)) should be (4L) // <-- fails
+    }
   }
 
   describe("proj_raster handling") {