Teradata Database performs implicit type conversion if the UDT has an implicit cast that casts between the UDT and any of the following predefined types.
| UDT Argument | Predefined Type |
|---|---|
| date_expression |
|
| timestamp_expression | |
| integer_expression | Numeric |
See "Implicit Type Conversions" in Teradata Vantage™ - Data Types and Literals, B035-1143. To define an implicit cast for a UDT, use the CREATE CAST statement and specify the AS ASSIGNMENT clause. For more information, see Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144.
Implicit type conversion of UDTs for system operators and functions, including ADD_MONTHS, is a Teradata extension to the ANSI SQL standard. To disable this extension, set the DisableUDTImplCastForSysFuncOp field of the DBS Control Record to TRUE.