User Guide : 5. Vector and Ingres : Unsupported Features
 
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Unsupported Features
Vector does not support the following features of Ingres Database:
Collation sequences, other than the UCS_BASIC column collation in tables stored with a Vector structure
User-defined data types and functions
The legacy language QUEL
Rules and some DDL statements
Note:  An unsupported function will cause the query to fail only if the function is not resolved (converted to a constant result) during query parsing or optimization.