_delta_log items missing createdTime field

[Petterhg]

Environment

Delta-rs version:
delta-rs.0.20.0

Binding:

Environment:

• Cloud provider: aws
• OS: ubuntu/aws fargate
• Other:

---

Bug

What happened:
I'm running the python client, with dynamodb as locking provider and s3 as storage. In order to catch when there is a schema change I have a logic that's like this (which then propagates the schema change to BigQuery that consumes the tables):

try:
        write_deltalake(
            f"{BUCKET}/{path}",
            data,
            schema=schema,
            mode="append",
            storage_options=storage_options,
            engine="rust",
            name=message.table_name,
            description=message.table_description,
            partition_by=message.partition_by,
        )
    except SchemaMismatchError as e:
        write_deltalake(
            f"{BUCKET}/{path}",
            data,
            schema=schema,
            mode="append",
            storage_options=storage_options,
            schema_mode="merge",
            engine="rust",
            name=message.table_name,
            description=message.table_description,
            partition_by=message.partition_by,
        )

I THINK the error is happening when the engine fails to write the items. It then creates a log item in s3 with no creationTime like below which BigQuery is unable to parse and then the complete table is failing to load. I don't know if this is expected behaviour from the lib and it's just BigQuery that is not reading the metadata correctly or if this actually is a bug in the lib.

{
    "metaData": {
        "id": "e79c2746-c678-4686-adc7-5fc361f08334",
        "name": null,
        "description": null,
        "format": {
            "provider": "parquet",
            "options": {}
        },
        "schemaString": "{\"type\":\"struct\",\"fields\":[{\"name\":\"crawler_id\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"source_id\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"source_type\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"show_id\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"show_name\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"show_url\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"episode_id\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"episode_name\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"episode_url\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"media_type\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"episode_published_at\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"episode_fetched_at\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"time_to_discovery_minutes\",\"type\":\"long\",\"nullable\":true,\"metadata\":{}},{\"name\":\"episode_published_year\",\"type\":\"long\",\"nullable\":true,\"metadata\":{}},{\"name\":\"episode_published_month\",\"type\":\"long\",\"nullable\":true,\"metadata\":{}},{\"name\":\"episode_published_day\",\"type\":\"long\",\"nullable\":true,\"metadata\":{}},{\"name\":\"episode_audio_url\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"country\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}},{\"name\":\"language\",\"type\":\"string\",\"nullable\":true,\"metadata\":{}}]}",
        "partitionColumns": [],
        "createdTime": null,
        "configuration": {}
    }
}
{
    "add": {
        "path": "part-00001-deae2bae-e35f-4504-a2cd-70407cc64328-c000.snappy.parquet",
        "partitionValues": {},
        "size": 9898,
        "modificationTime": 1729226114839,
        "dataChange": true,
        "stats": "{\"numRecords\":4,\"minValues\":{\"crawler_id\":\"987e918be3074bec8d1b797847e1f7be\",\"episode_published_at\":\"2024-10-18T08:00:00+02:00\",\"show_name\":\"Ekot nyhetssändning\",\"media_type\":\"audio\",\"episode_published_day\":18,\"show_url\":\"https://sverigesradio.se/ekot\",\"episode_fetched_at\":\"2024-10-18T06:32:37.174549+02:00\",\"episode_id\":\"2460304\",\"source_type\":\"radio\",\"time_to_discovery_minutes\":-117,\"episode_url\":\"https://sverigesradio.se/avsnitt/2460306\",\"source_id\":\"sverigesradio\",\"episode_published_year\":2024,\"episode_published_month\":10,\"episode_audio_url\":\"https://sverigesradio.se/topsy/ljudfil/9519131-hi\",\"episode_name\":\"Ekot 06:00 Terrormilisen Hizbollah meddelar att man trappar upp konflikten med Israel\",\"show_id\":\"sverigesradio_ekot_nyhetssandning\",\"country\":\"se\"},\"maxValues\":{\"time_to_discovery_minutes\":-84,\"show_url\":\"https://sverigesradio.se/ekotsenastenytt\",\"episode_published_year\":2024,\"episode_published_month\":10,\"country\":\"se\",\"show_id\":\"sverigesradio_ekot_senaste_nytt\",\"episode_url\":\"https://sverigesradio.se/avsnitt/ekot-0600-terrormilisen-hizbollah-meddelar-att-man-trappar-upp-konflikten-med-israel\",\"episode_id\":\"2465216\",\"crawler_id\":\"987e918be3074bec8d1b797847e1f7be\",\"media_type\":\"audio\",\"episode_published_at\":\"2024-10-18T08:30:00+02:00\",\"episode_audio_url\":\"https://sverigesradio.se/topsy/ljudfil/9519145-hi\",\"source_id\":\"sverigesradio\",\"episode_fetched_at\":\"2024-10-18T06:35:05.740971+02:00\",\"episode_name\":\"Ekot senaste nytt\",\"show_name\":\"Ekot senaste nytt\",\"episode_published_day\":18,\"source_type\":\"radio\"},\"nullCount\":{\"episode_published_month\":0,\"source_id\":0,\"time_to_discovery_minutes\":0,\"show_name\":0,\"country\":0,\"media_type\":0,\"show_id\":0,\"language\":4,\"episode_name\":0,\"source_type\":0,\"episode_published_at\":0,\"episode_fetched_at\":0,\"episode_published_year\":0,\"episode_audio_url\":0,\"episode_id\":0,\"crawler_id\":0,\"episode_url\":0,\"show_url\":0,\"episode_published_day\":0}}",
        "tags": null,
        "deletionVector": null,
        "baseRowId": null,
        "defaultRowCommitVersion": null,
        "clusteringProvider": null
    }
}
{
    "commitInfo": {
        "timestamp": 1729226114840,
        "operation": "WRITE",
        "operationParameters": {
            "mode": "Append"
        },
        "operationMetrics": {
            "execution_time_ms": 105,
            "num_added_files": 1,
            "num_added_rows": 4,
            "num_partitions": 0,
            "num_removed_files": 0
        },
        "clientVersion": "delta-rs.0.20.0"
    }
}

I CAN read the table when using the Python client, just not with BigQuery. Any advice here would be highly appreciated.

What you expected to happen:

How to reproduce it:

More details:

[ion-elgreco]

It's an optional field so that's something google needs to address in bigquery

[rtyler]

@Petterhg as @ion-elgreco mentioned createdTime is optional but unfortunately some delta implementations do not treat optional as actually optional 😭

#2926 does ensure that the createdTime gets set when a new metadata action is created, such as on schema evolution, so perhaps once I release 0.20.2 you would be able to modify the schema of that table or recreate it in order to make it BigQuery readable?