The EXTFNAPIV4_DESCRIBE_COL_CAN_BE_NULL attribute indicates if the column can be null. Used in a describe_column_set scenario.
a_sql_byte
True, if the column can be NULL. This property is valid only for table arguments. This property is valid only for argument 0.
The UDF can set this property for a result table column if that column can be NULL. If the UDF does not explicitly set this property, it is assumed that the column can be NULL. The server can use this information during the Optimization state.
EXTFNAPIV4_DESCRIBE_BUFFER_SIZE_MISMATCH – set error returned if the describe buffer is not the size of a_sql_byte.
EXTFNAPIV4_DESCRIBE_INVALID_STATE – set error returned if the state is not equal to OPTIMIZATION.
EXTFNAPIV4_DESCRIBE_INVALID_ATTRIBUTE_VALUE – set error returned if the UDF attempts to set this attribute to a value other than 0 or 1.
Valid in: