viirya commented on code in PR #50593:
URL: https://github.com/apache/spark/pull/50593#discussion_r2048303788


##########
sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/ColumnDefaultValue.java:
##########
@@ -33,25 +34,20 @@
  * data that do not have these new columns.
  */
 @Evolving
-public class ColumnDefaultValue {
-  private String sql;
-  private Literal<?> value;
+public class ColumnDefaultValue extends DefaultValue {
+  private final Literal<?> value;
 
   public ColumnDefaultValue(String sql, Literal<?> value) {
-    this.sql = sql;
-    this.value = value;
+    this(sql, null /* no expression */, value);
   }
 
-  /**
-   * Returns the SQL string (Spark SQL dialect) of the default value 
expression. This is the
-   * original string contents of the SQL expression specified at the time the 
column was created in
-   * a CREATE TABLE, REPLACE TABLE, or ADD COLUMN command. For example, for
-   * "CREATE TABLE t (col INT DEFAULT 40 + 2)", this returns the string 
literal "40 + 2" (without
-   * quotation marks).
-   */
-  @Nonnull
-  public String getSql() {
-    return sql;
+  public ColumnDefaultValue(Expression expr, Literal<?> value) {
+    this(null /* no sql */, expr, value);
+  }
+
+  public ColumnDefaultValue(String sql, Expression expr, Literal<?> value) {

Review Comment:
   Hmm, as now it has `Expression`, why we still need `Literal`? Cannot the 
expression a literal?



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