ORC-2053: Use Java Set.of instead of Collections.emptySet

Author: dongjoon-hyun

java/checkstyle.xml

@@ -52,6 +52,10 @@
       <property name="ignoreComments" value="true"/>
       <property name="message" value="No starting LAND and LOR allowed."/>
     </module>
+    <module name="RegexpSinglelineJava">
+      <property name="format" value="Collections\.emptySet"/>
+      <property name="message" value="Use Set.of() instead." />
+    </module>
     <module name="Indentation">
       <property name="severity" value="error"/>
       <property name="basicOffset" value="2"/>

java/core/src/java/org/apache/orc/impl/TreeReaderFactory.java

@@ -53,7 +53,6 @@
 import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -143,7 +142,7 @@ public static class ReaderContext implements Context {
     private ReaderEncryption encryption;
     private boolean useProlepticGregorian;
     private boolean fileUsedProlepticGregorian;
-    private Set<Integer> filterColumnIds = Collections.emptySet();
+    private Set<Integer> filterColumnIds = Set.of();
     Consumer<OrcFilterContext> filterCallback;
 
     public ReaderContext setSchemaEvolution(SchemaEvolution evolution) {

java/core/src/java/org/apache/orc/impl/reader/StripePlanner.java

@@ -44,7 +44,6 @@
 import java.security.Key;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -123,7 +122,7 @@ public StripePlanner(TypeDescription schema,
                        boolean ignoreNonUtf8BloomFilter,
                        long maxBufferSize) {
     this(schema, encryption, dataReader, version, ignoreNonUtf8BloomFilter, maxBufferSize,
-         Collections.emptySet());
+         Set.of());
   }
 
   public StripePlanner(StripePlanner old) {