public String addForUpdateClause(String selectStatement) throws MetaException {
    return dbProduct.addForUpdateClause(selectStatement);
  }
Given a {@code selectStatement}, decorated it with FOR UPDATE or semantically equivalent
construct.  If the DB doesn't support, return original select.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/tools/SQLGenerator.java