Complete Spark integration test suite

test/java/spark/.gitignore

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+# Maven
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+
+# IDE
+.idea/
+*.iml
+.vscode/
+.classpath
+.project
+.settings/
+
+# Spark
+spark-warehouse/
+metastore_db/
+derby.log
+
+# Logs
+*.log
+
+# OS
+.DS_Store
+Thumbs.db
+