kamaci edited a comment on issue #7027: Auto Detection of Field Types URL: https://github.com/apache/incubator-druid/issues/7027#issuecomment-461331076 Currently, all fields are threaten as String when `dimensions` field is empty: > Schema-less dimensions > If the dimensions field is left empty in your ingestion spec, Druid will treat every column that is not the timestamp column, a dimension that has been excluded, or a metric column as a dimension. It should be noted that because of #658 these segments will be slightly larger than if the list of dimensions was explicitly specified in lexicographic order. This limitation does not impact query correctness- just storage requirements. > > Note that when using schema-less ingestion, all dimensions will be ingested as String-typed dimensions. However, it can work as similar to [Solr Schemaless Mode](https://lucene.apache.org/solr/guide/7_6/schemaless-mode.html).
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