How can I check that column on a delta table has a "NOT NULL" constraint or not?

[Lon_Fortes]

Title pretty much says it all -

I'm trying to determine whether or not a column on my existing delta table was defined as NOT NULL or not. It does not show up in any of the metadata (describe detail, describe history, show tblproperties).

Thanks in advance

[Lon_Fortes · Accepted solution]

I've found a solution, the following scala serves my needs:

val table = spark.table("<database>.<tablename>")

val schema = table.printSchema

[Matthew8]

walgreenslistens Wrote:

A UNIQUE constraint defines a set of columns that uniquely identify rows in a table only if all the key values are not NULL. If one or more key parts are NULL, duplicate keys are allowed.

[muki]

if using python, we can use

display(spark.catalog.listColumns('<catalog>.<schema>.<table>'))

[iyashk-DB]

@muki , you can run 
SHOW CREATE TABLE <catalog>.<schema>.<table>

and in that also you can also see the constraints applied.