10.8. Null Ordering

The method ExecutionFactory.getDefaultNullOrder() specifies the default null order. It can be one of UNKNOWN, LOW, HIGH, FIRST, LAST. This is only used if ORDER BY is supported, but null ordering is not.

The method ExecutionFactory.getCollation() specifies the default collation. If you set it to a value that does not match the collation locale defined by org.teiid.collationLocale, then some ordering may not be pushed down.