NPE when OracleValueConverters get unsupported jdbc type

In the schemaBuilder method implementation of OracleValueConverters, if the type value of Column does not meet the specified value, the default logic will obtain the default schema implementation, but it is also possible to obtain a null value, and the subsequent log print information will throw NPE.

public SchemaBuilder schemaBuilder(Column column) {
// ...
switch (column.jdbcType()) {
// ...
 default: {
SchemaBuilder builder = super.schemaBuilder(column);
// This builder may be a null value
 logger.debug("JdbcValueConverters returned '{}' for column '{}'", builder.getClass().getName()
}
// ...