[fix][core] Add time type judgment method

Author: wt0530

core/src/main/java/org/apache/calcite/sql/type/SqlTypeUtil.java

@@ -52,18 +52,16 @@
 
 import java.math.BigDecimal;
 import java.nio.charset.Charset;
-import java.util.AbstractList;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
 import static org.apache.calcite.rel.type.RelDataTypeImpl.NON_NULLABLE_SUFFIX;
 import static org.apache.calcite.sql.type.NonNullableAccessors.getCharset;
 import static org.apache.calcite.sql.type.NonNullableAccessors.getCollation;
 import static org.apache.calcite.sql.type.NonNullableAccessors.getComponentTypeOrThrow;
+import static org.apache.calcite.sql.type.SqlTypeName.TIME;
+import static org.apache.calcite.sql.type.SqlTypeName.TIME_WITH_LOCAL_TIME_ZONE;
 import static org.apache.calcite.util.Static.RESOURCE;
 
 import static java.util.Objects.requireNonNull;
@@ -387,6 +385,13 @@ public static boolean isDate(RelDataType type) {
     return type.getSqlTypeName() == SqlTypeName.DATE;
   }
 
+  public static boolean isTime(RelDataType type) {
+    return Optional.ofNullable(type)
+            .map(RelDataType::getSqlTypeName)
+            .map(sqlTypeName -> sqlTypeName == TIME || sqlTypeName == TIME_WITH_LOCAL_TIME_ZONE)
+            .orElse(false);
+  }
+
   /** Returns whether a type is TIMESTAMP. */
   public static boolean isTimestamp(RelDataType type) {
     return SqlTypeFamily.TIMESTAMP.contains(type);