Label queries fail on Sybase

Because some label queries use large Group By clauses, they fail on Sybase:

org.springframework.jdbc.UncategorizedSQLException: (Hibernate operation): encountered SQLException [The current query would generate a key size of 799 for a work table. This exceeds the maximum allowable limit of 600. ]; nested exception is com.sybase.jdbc3.jdbc.SybSQLException: The current query would generate a key size of 799 for a work table. This exceeds the maximum allowable limit of 600.
at org.springframework.jdbc.support.SQLStateSQLExceptionTranslator.translate(SQLStateSQLExceptionTranslator.java:94)
caused by: com.sybase.jdbc3.jdbc.SybSQLException: The current query would generate a key size of 799 for a work table. This exceeds the maximum allowable limit of 600.
at com.sybase.jdbc3.tds.Tds.a(Unknown Source)

The label_findSingleDegreeSeparationFromLabel and label_findSingleDegreeSeparationFromLabelBySpace queries need to be changed for Sybase.