Add ingest internal file option to link files

New option literally appeared when I rebased to PR previous updates. Add linkFiles option now.

java/rocksjni/ingest_external_file_options.cc

@@ -291,6 +291,30 @@ Java_org_rocksdb_IngestExternalFileOptions_setFailIfNotLastLevel(
       jfail_if_not_bottommost_level == JNI_TRUE;
 }
 
+/*
+ * Class:     org_rocksdb_IngestExternalFileOptions
+ * Method:    linkFiles
+ * Signature: (J)Z
+ */
+JNIEXPORT jboolean JNICALL Java_org_rocksdb_IngestExternalFileOptions_linkFiles(
+    JNIEnv*, jclass, jlong jhandle) {
+  auto* options =
+      reinterpret_cast<ROCKSDB_NAMESPACE::IngestExternalFileOptions*>(jhandle);
+  return options->link_files == JNI_TRUE;
+}
+
+/*
+ * Class:     org_rocksdb_IngestExternalFileOptions
+ * Method:    setLinkFiles
+ * Signature: (JZ)V
+ */
+JNIEXPORT void JNICALL Java_org_rocksdb_IngestExternalFileOptions_setLinkFiles(
+    JNIEnv*, jclass, jlong jhandle, jboolean jlink_files) {
+  auto* options =
+      reinterpret_cast<ROCKSDB_NAMESPACE::IngestExternalFileOptions*>(jhandle);
+  options->link_files = jlink_files == JNI_TRUE;
+}
+
 /*
  * Class:     org_rocksdb_IngestExternalFileOptions
  * Method:    disposeInternal

java/src/main/java/org/rocksdb/IngestExternalFileOptions.java

@@ -344,6 +344,31 @@ public IngestExternalFileOptions setFailIfNotLastLevel(final boolean failIfNotLa
     return this;
   }
 
+  /**
+   * True if the files will be linked instead of copying them.
+   * Same as moveFiles except that input files will NOT be unlinked.
+   * Only one of `moveFiles` and `linkFiles` can be set at the same time.
+   *
+   * @return true if files will be moved
+   */
+  public boolean linkFiles() {
+    return linkFiles(nativeHandle_);
+  }
+
+  /**
+   * Can be set to true to link the files instead of copying them.
+   * Same as moveFiles except that input files will NOT be unlinked.
+   * Only one of `moveFiles` and `linkFiles` can be set at the same time.
+   *
+   * @param linkFiles true if files should be linked instead of copied
+   *
+   * @return the reference to the current IngestExternalFileOptions.
+   */
+  public IngestExternalFileOptions setLinkFiles(final boolean linkFiles) {
+    setLinkFiles(nativeHandle_, linkFiles);
+    return this;
+  }
+
   private static native long newIngestExternalFileOptions();
   private static native long newIngestExternalFileOptions(final boolean moveFiles,
       final boolean snapshotConsistency, final boolean allowGlobalSeqNo,
@@ -381,4 +406,7 @@ private static native void setVerifyFileChecksum(
   private static native boolean failIfNotLastLevel(final long handle);
   private static native void setFailIfNotLastLevel(
       final long handle, final boolean failIfNotLastLevel);
+
+  private static native boolean linkFiles(final long handle);
+  private static native void setLinkFiles(final long handle, final boolean linkFiles);
 }

java/src/test/java/org/rocksdb/IngestExternalFileOptionsTest.java

@@ -146,4 +146,15 @@ public void failIfNotLastLevel() {
       assertThat(options.failIfNotLastLevel()).isFalse();
     }
   }
+
+  @Test
+  public void linkFiles() {
+    try (final IngestExternalFileOptions options = new IngestExternalFileOptions()) {
+      assertThat(options.linkFiles()).isFalse();
+      assertThat(options.setLinkFiles(true)).isEqualTo(options);
+      assertThat(options.linkFiles()).isTrue();
+      assertThat(options.setLinkFiles(false)).isEqualTo(options);
+      assertThat(options.linkFiles()).isFalse();
+    }
+  }
 }