Andras Csillag comments

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                                            Andras Csillag

Add unit tests for constraint_append not null constraints

I'd be happy to add these tests, can you assign it to me please?

Add unit tests for constraint_append not null constraints

Unfortunately, NOT NULL constraints are not checked in the current implementation of the constraint_append function, because they're not stored as delta table properties but with the table schema. I think...

Provide an API to add constraints to a Delta Table via Python

Actually, because constraints end up as properties of the Delta table, you can add constraints with the following syntax. It's not elegant but it's an optional workaround: ``` target_table =...

Provide an API to add constraints to a Delta Table via Python

Yes, that's true. It seems that a DeltaTableBuilder object can only be created with `create()`, `createIfNotExists()`, `replace() ` or `createOrReplace()` methods there's no `alter()` function.

[FEATURE REQUEST] Make constraint_append work with streaming datasets

@matthew-powers-db , you can assign this to me!