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Iceberg tables containing only AVRO files or no AVRO files at all can now be read by Impala. Mixed file format tables with AVRO are currently unsupported. Impala uses its avro scanner to read AVRO files, therefore all the avro related limitations apply here as well: writes/metadata changes are not supported. testing: - created test tables: 'iceberg_avro_only' contains only AVRO files; 'iceberg_avro_mixed' contains all file formats: avro+orc+parquet - added E2E test that reads Avro-only table - added test case to iceberg-negative.test that tries to read mixed file format table Change-Id: I827e5707e54bebabc614e127daa48255f86f4c4f Reviewed-on: http://gerrit.cloudera.org:8080/19084 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>