skambha opened a new issue #1324:
URL: https://github.com/apache/iceberg/issues/1324
The SQL command to add the new required column succeeds, but the metadata
still shows the column as not required.
Spark3:
```
scala> spark.sql("CREATE TABLE local.t1 (id int COMMENT 'unique id', data
string not null) USING iceberg")
res0: org.apache.spark.sql.DataFrame = []
scala> spark.sql("ALTER TABLE local.t1 ADD COLUMN time int NOT NULL")
res1: org.apache.spark.sql.DataFrame = []
scala> spark.table("local.t1").printSchema
root
|-- id: integer (nullable = true)
|-- data: string (nullable = false)
|-- time: integer (nullable = true)
```
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