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ElasticSearch Adapters. Calcite vs Dremio


I've noticed that Dremio implemented
their own (calcite) adapters for ElasticSearch.

According to documentation
<https://www.dremio.com/tutorials/unlocking-sql-on-elasticsearch/> those
adapters support ES aggregations (lacking in calcite) plus more advanced
features like date ranges or native scripting
Is there a reason they're not backported / used in calcite ?  More
specifically is there any (technical) reason for those plugins to be
developed independently ?

Thanks in advance,