[#3477] Add Field.as(Field) to rename a field to another field's name

jOOQ/src/main/java/org/jooq/Field.java

@@ -143,6 +143,19 @@ public interface Field<T> extends GroupField {
     @Support
     Field<T> as(String alias);
 
+    /**
+     * Create an alias for this field based on another field's name.
+     * <p>
+     * Note that the case-sensitivity of the returned field depends on
+     * {@link Settings#getRenderNameStyle()}. By default, field aliases are
+     * quoted, and thus case-sensitive!
+     *
+     * @param otherField The other field whose name this field is aliased with.
+     * @return The field alias.
+     */
+    @Support
+    Field<T> as(Field<?> otherField);
+
     /**
      * {@inheritDoc}
      * <p>

jOOQ/src/main/java/org/jooq/impl/AbstractField.java

@@ -153,6 +153,11 @@ abstract class AbstractField<T> extends AbstractQueryPart implements Field<T> {
         return new FieldAlias<T>(this, alias);
     }
 
+    @Override
+    public final Field<T> as(Field<?> otherField) {
+        return as(otherField.getName());
+    }
+
     @Override
     public final String getName() {
         return name;