[GLUTEN-7912][VL] Flip dependency direction for gluten-delta (#8218)

Closes #7912

backends-velox/pom.xml

@@ -101,6 +101,65 @@
         </plugins>
       </build>
     </profile>
+
+    <profile>
+      <id>delta</id>
+      <dependencies>
+        <dependency>
+          <groupId>org.apache.gluten</groupId>
+          <artifactId>gluten-delta</artifactId>
+          <version>${project.version}</version>
+        </dependency>
+        <dependency>
+          <groupId>org.apache.gluten</groupId>
+          <artifactId>gluten-delta</artifactId>
+          <version>${project.version}</version>
+          <type>test-jar</type>
+          <scope>test</scope>
+        </dependency>
+        <dependency>
+          <groupId>io.delta</groupId>
+          <artifactId>${delta.package.name}_${scala.binary.version}</artifactId>
+          <scope>provided</scope>
+        </dependency>
+      </dependencies>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.codehaus.mojo</groupId>
+            <artifactId>build-helper-maven-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>add-delta-sources</id>
+                <phase>generate-sources</phase>
+                <goals>
+                  <goal>add-source</goal>
+                </goals>
+                <configuration>
+                  <sources>
+                    <source>${project.basedir}/src/main-delta/scala</source>
+                    <source>${project.basedir}/src/main-delta/java</source>
+                  </sources>
+                </configuration>
+              </execution>
+              <execution>
+                <id>add-delta-test-sources</id>
+                <phase>generate-test-sources</phase>
+                <goals>
+                  <goal>add-test-source</goal>
+                </goals>
+                <configuration>
+                  <sources>
+                    <source>${project.basedir}/src/test-delta/scala</source>
+                    <source>${project.basedir}/src/test-delta/java</source>
+                  </sources>
+                </configuration>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
   </profiles>
 
   <dependencies>

backends-velox/src/test-delta/scala/org/apache/gluten/execution/VeloxDeltaSuite.scala

@@ -0,0 +1,19 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.gluten.execution
+
+class VeloxDeltaSuite extends DeltaSuite

gluten-delta/src/test/scala/org/apache/gluten/execution/VeloxTPCHDeltaSuite.scala → backends-velox/src/test-delta/scala/org/apache/gluten/execution/VeloxTPCHDeltaSuite.scala

@@ -21,9 +21,8 @@ import org.apache.spark.SparkConf
 import java.io.File
 
 class VeloxTPCHDeltaSuite extends VeloxTPCHSuite {
-
-  protected val tpchBasePath: String = new File(
-    "../backends-velox/src/test/resources").getAbsolutePath
+  protected val tpchBasePath: String =
+    getClass.getResource("/").getPath + "../../../src/test/resources"
 
   override protected val resourcePath: String =
     new File(tpchBasePath, "tpch-data-parquet").getCanonicalPath

gluten-delta/pom.xml

@@ -49,19 +49,6 @@
       <type>test-jar</type>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.apache.gluten</groupId>
-      <artifactId>backends-velox</artifactId>
-      <version>${project.version}</version>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.apache.gluten</groupId>
-      <artifactId>backends-velox</artifactId>
-      <version>${project.version}</version>
-      <type>test-jar</type>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
       <artifactId>spark-core_${scala.binary.version}</artifactId>

gluten-delta/src/test/scala/org/apache/gluten/execution/VeloxDeltaSuite.scala → gluten-delta/src/test/scala/org/apache/gluten/execution/DeltaSuite.scala

@@ -22,9 +22,10 @@ import org.apache.spark.sql.types.{ArrayType, IntegerType, MapType, StringType,
 
 import scala.collection.JavaConverters._
 
-class VeloxDeltaSuite extends WholeStageTransformerSuite {
-
+abstract class DeltaSuite extends WholeStageTransformerSuite {
   protected val rootPath: String = getClass.getResource("/").getPath
+  // FIXME: This folder doesn't exist in module gluten-delta so should be provided by
+  //  backend modules that rely on this suite.
   override protected val resourcePath: String = "/tpch-data-parquet"
   override protected val fileFormat: String = "parquet"
 

gluten-iceberg/src/test/scala/org/apache/gluten/execution/IcebergSuite.scala

@@ -23,8 +23,8 @@ import org.apache.spark.sql.Row
 
 abstract class IcebergSuite extends WholeStageTransformerSuite {
   protected val rootPath: String = getClass.getResource("/").getPath
-  // FIXME: This folder is in module backends-velox so is not accessible if profile backends-velox
-  //  is not enabled during Maven build.
+  // FIXME: This folder doesn't exist in module gluten-iceberg so should be provided by
+  //  backend modules that rely on this suite.
   override protected val resourcePath: String = "/tpch-data-parquet"
   override protected val fileFormat: String = "parquet"