f

kernel/kernel-api/src/main/java/io/delta/kernel/expressions/Literal.java

@@ -17,7 +17,6 @@
 package io.delta.kernel.expressions;
 
 import java.math.BigDecimal;
-import java.sql.Date;
 import java.util.Collections;
 import java.util.List;
 
@@ -39,7 +38,6 @@
 import io.delta.kernel.types.TimestampType;
 
 import static io.delta.kernel.internal.util.InternalUtils.checkArgument;
-import static io.delta.kernel.utils.Utils.daysSinceEpoch;
 
 /**
  * A literal value.
@@ -57,11 +55,8 @@
  * </p>
  */
 public final class Literal implements Expression {
-    public static final Literal TRUE = Literal.of(true);
-    public static final Literal FALSE = Literal.of(false);
-
     /**
-     * Create a boolean {@link Literal} object
+     * Create a {@code boolean} type {@link Literal} object
      *
      * @param value boolean value
      * @return a {@link Literal} with data type {@link BooleanType}
@@ -136,11 +131,12 @@ public static Literal of(byte[] value) {
     }
 
     /**
-     * @return a {@link Literal} with data type {@link DateType}
+     * @param numOfDaysSinceEpochUTC Number of days since the epoch in UTC timezone.
+     * @return a {@link Literal} with data type {@link BooleanType}
+     * @l Create a {@code date} type {@link Literal}.
      */
-    public static Literal of(Date value) {
-        int numOfDaysSinceEpoch = daysSinceEpoch(value);
-        return new Literal(numOfDaysSinceEpoch, DateType.INSTANCE);
+    public static Literal ofDate(int numOfDaysSinceEpochUTC) {
+        return new Literal(numOfDaysSinceEpochUTC, DateType.INSTANCE);
     }
 
     /**
@@ -164,6 +160,9 @@ public static Literal of(BigDecimal value, int precision, int scale) {
     }
 
     /**
+     * Create {@code null} literl.
+     *
+     * @param dataType {@link DataType} of the null literal.
      * @return a null {@link Literal} with the given data type
      */
     public static Literal ofNull(DataType dataType) {
@@ -205,6 +204,12 @@ public Object value() {
         return value;
     }
 
+    /**
+     * Get the datatype of the literal object. Datatype lets the caller interpret the value of the
+     * literal object returned by {@link #value}
+     *
+     * @return Datatype of the literal object.
+     */
     public DataType dataType() {
         return dataType;
     }