Special value that is used to indicate that a statement had no result. The method Statement#getUpdateCount() will return this value if the previous statement that was executed
with Statement#execute(String) returned com.google.cloud.spanner.connection.StatementResult.ResultType#NO_RESULT, such as DDL
statements.
Special value that is used to indicate that a statement returned a ResultSet. The
method Statement#getUpdateCount() will return this value if the previous statement that
was executed with Statement#execute(String) returned a ResultSet.