getTargetColumnSchema
override fun getTargetColumnSchema(tableColumnMetadata: TableColumnMetadata, expectedValueType: KType): ColumnSchema?
Returns the target schema of the given column which buildDataColumn will adhere to. This schema corresponds to type P, in the sense that it will describe the schema of DataColumn<P>.
If null is returned, the schema cannot be determined before looking at the actual data.
Return
the target schema of the given column, or null if it cannot be determined from the types alone.
Parameters
tableColumnMetadata
all information we have about the column
expectedValueType
the type of the values after preprocessing, D