`mergeSchema` support

[adamjones2]

Is there any support for the mergeSchema option? I see this completed issue for adding it to delta-rs but I'm not clear if it's exposed in any way through delta-dotnet? I was hoping to find a WriteMode property in place of the boolean InsertOptions.OverwriteSchema.

[mightyshazam]

I haven't tested it, but it should be supported since SchemaMode::Merge is the default behavior for inserts.

[adamjones2]

Thanks, it looks like you're right. In that case just to clarify, schema enforcement isn't supported, only merging and overwriting?

[mightyshazam]

At the moment, it is limited to whatever delta-rs does when merging. I believe your assumption is correct.