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what are the supported data sources? I saw SQL tables and I imagine flat files, can you write calls to web service endpoints?

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From the readme file:

Database Support

Caravel was originally designed on top of Druid.io, but quickly broadened its scope to support other databases through the use of SqlAlchemy, a Python ORM that is compatible with most common databases[1].

[1]http://docs.sqlalchemy.org/en/rel_1_0/core/engines.html

Specifically, SQLAlchemy includes dialects out of the box for: Firebird, Microsoft SQL Server, MySQL, Oracle, PostgreSQL, SQLite, Sybase.

http://docs.sqlalchemy.org/en/rel_1_0/dialects/index.html

And has adapters for Hive, Presto, Redshift and Google BigQuery.

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