Dynamic Column Writer Types

[NickEFallows]

Anyone know how to set a LogicalColumnWriter's type dynamically?

I have to loop through multiple columns to write the data to a parquet file and I cannot guarantee that the Data Type is known before runtime...

It seems weird that you can dynamically set them in the schema but you can't for the writers to those columns

[adamreeve]

Hi @NickEFallows

You can write a class that implements the ILogicalColumnWriterVisitor interface and use LogicalColumnWriter.Apply to apply the visitor without knowing what the column type will be ahead of time. There's a LogicalValueSetter class used in tests that might be helpful as an example.

Does this help with your use case?