preprocessValue
override fun <J, D> preprocessValue(value: J, tableColumnMetadata: TableColumnMetadata, expectedJdbcType: KType, expectedPreprocessedValueType: KType): D
(Potentially) preprocesses the value for the given column before collecting it in a DataFrame DataColumn.
While DbType contains some basic preprocessing logic, converting some Java classes to Kotlin ones, it's often necessary to override this function for specific JDBC implementations.
Return
the preprocessed version of value
Parameters
value
the value to preprocess
tableColumnMetadata
all information we have about the column
expectedJdbcType
the JDBC type, J, obtained from getExpectedJdbcType
expectedPreprocessedValueType
the type of the return value, D, obtained from getPreprocessedValueType
Type Parameters
J
the JDBC type, expectedJdbcType
D
the type of the return value, expectedPreprocessedValueType