AvroFileAppender metrics

[Luis Otero]

Hi,

AvroFileAppender doesn't report min/max values (
https://github.com/apache/incubator-iceberg/blob/80cbc60ee55911ee627a7ad3013804394d7b5e9a/core/src/main/java/org/apache/iceberg/avro/AvroFileAppender.java#L60
).

As a side effect (I think) overwrite operations (if there are data files
with the same partition) fail with "Cannot delete file where some, but not
all, rows match filter" because StrictMetricsEvaluator can't confirm all
rows match.

For instance, if you modify TestLocalScan with:

    this.partitionSpec =
PartitionSpec.builderFor(SCHEMA).bucket("id",10).build();

    this.file1Records = new ArrayList<Record>();
    file1Records.add(record.copy(ImmutableMap.of("id", 60L, "data",
UUID.randomUUID().toString())));
    DataFile file1 = writeFile(sharedTable.location(),
format.addExtension("file-1"), file1Records);

    this.file2Records = new ArrayList<Record>();
    file2Records.add(record.copy(ImmutableMap.of("id", 1L, "data",
UUID.randomUUID().toString())));
    DataFile file2 = writeFile(sharedTable.location(),
format.addExtension("file-2"), file2Records);

    this.file3Records = new ArrayList<Record>();
    file3Records.add(record.copy(ImmutableMap.of("id", 1L, "data",
UUID.randomUUID().toString())));
    DataFile file3 = writeFile(sharedTable.location(),
format.addExtension("file-3"), file3Records);

    sharedTable.newAppend()
        .appendFile(file1)
        .commit();

    sharedTable.newAppend()
        .appendFile(file2)
        .commit();

    sharedTable.newOverwrite()
        .overwriteByRowFilter(equal("id",1L))
        .addFile(file3)
        .commit();


Fails with 'org.apache.iceberg.exceptions.ValidationException: Cannot
delete file where some, but not all, rows match filter ref(name="id") == 1:
file:/AVRO/file-2.avro' for AVRO format but works fine for PARQUET format.

Am I missing something here?

Thanks!!