public PropertySchema getSchema(String name) {
    return null;
  }
Gets a schema by name.
<p>Only used by {@link #importDefaultValues(Properties)}</p>
@param name schema name
@return the schema instance, null if no such schema is known
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/properties/PropertyManager.java