The org.datanucleus.store.rdbms.sql.expression.TemporalLiteral class does not quote non-property Date (or Timestamp) values when writing them out to SQLText. This can cause queries to fail as these values contains space(s).

The error I've received is "java.sql.SQLException: Unexpected token...", which is listed in full in the referenced forum thread. Specifically, I've seen this occur when trying to delete an instance of a class that:
 * uses application ID
 * has more than one primary key field (and thus an Object ID class)
 * is a concrete subclass (using InheritanceStrategy.SUPERCLASS_TABLE) of an abstract base class (using InheritanceStrategy.NEW_TABLE and DiscriminatorStrategy.CLASS_NAME)

Before deleting the instance, it issues a query based on the instance's ID, which fails with the previously-mentioned exception.

It's been a long time since I've done any SQL by hand, but I believe this problem would be resolved by wrapping the Date/Timestamp values in single quotes. I will attach a patch that addresses that.