mistercrunch commented on issue #5279: Slices backed by AWS Athena load sequentially, not in parallel. URL: https://github.com/apache/incubator-superset/issues/5279#issuecomment-403046924 The Celery workers are mostly there to deal with long running queries and heavy workloads. `create_engine` being called for each query is right, we do not use connection pooling for external databases, only for the connections to the metadata database.
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