d-tw opened a new issue, #7771:
URL: https://github.com/apache/iceberg/issues/7771
### Apache Iceberg version
1.2.1 (latest release)
### Query engine
Spark
### Please describe the bug 🐞
When creating an iceberg table via Spark using a Glue catalog, the
non-nullability of columns is not preserved - all columns are stored as
nullable.
I don't know if this is a bug, or a config issue, but I'm using a vanilla
config and couldn't find anything in the docs.
Launching spark as follows:
```sh
/opt/spark/bin/pyspark --packages
"org.apache.iceberg:iceberg-spark-runtime-3.3_2.12:1.0.0,software.amazon.awssdk:bundle:2.17.178,software.amazon.awssdk:url-connection-client:2.17.178"
\
--conf
spark.sql.catalog.my_catalog=org.apache.iceberg.spark.SparkCatalog \
--conf spark.sql.catalog.my_catalog.warehouse=/unused-warehouse \
--conf
spark.sql.catalog.my_catalog.catalog-impl=org.apache.iceberg.aws.glue.GlueCatalog
\
--conf
spark.sql.catalog.my_catalog.io-impl=org.apache.iceberg.aws.s3.S3FileIO \
--conf
spark.sql.catalog.spark_catalog=org.apache.iceberg.spark.SparkSessionCatalog \
--conf spark.sql.catalog.spark_catalog.type=hive \
--conf spark.hadoop.fs.s3a.access.key=$AWS_ACCESS_KEY_ID \
--conf spark.hadoop.fs.s3a.secret.key=$AWS_SECRET_ACCESS_KEY \
--conf
"spark.driver.extraJavaOptions=-Dsoftware.amazon.awssdk.http.service.impl=software.amazon.awssdk.http.urlconnection.UrlConnectionSdkHttpService
-Dderby.system.home=/tmp/derby -Divy.cache.dir=/tmp -Divy.home=/tmp" \
--conf
"spark.executor.extraJavaOptions=-Dsoftware.amazon.awssdk.http.service.impl=software.amazon.awssdk.http.urlconnection.UrlConnectionSdkHttpService
-Dderby.system.home=/tmp/derby -Divy.cache.dir=/tmp -Divy.home=/tmp"
```
Running the following commands:
```py
from pyspark.sql.types import StructType, StructField, StringType
schema = StructType([StructField('foo', StringType(), nullable=False)])
df = spark.createDataFrame([], schema=schema)
df.printSchema()
# root
# |-- foo: string (nullable = false)
df.writeTo('my_table_with_non_null_fields').create()
spark.table('my_table_with_non_null_fields').printSchema()
# root
# |-- foo: string (nullable = true)
```
When I check the contents of the Glue catalog, I find:
```json
"Columns": [
{
"Name": "foo",
"Type": "string",
"Parameters": {
"iceberg.field.current": "true",
"iceberg.field.id": "1",
"iceberg.field.optional": "true"
}
}
]
```
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