commit | 5cd7610fb61405108820de4b2173e690b8df3011 | [log] [tgz] |
---|---|---|
author | Gian Merlino <gianmerlino@gmail.com> | Fri Aug 28 07:57:06 2020 -0700 |
committer | GitHub <noreply@github.com> | Fri Aug 28 07:57:06 2020 -0700 |
tree | 444e5ba8219b22e9e25c48b858401d11cfe6e1ca | |
parent | f82fd22fa7de175200b7127c34c2eb2900bf7317 [diff] |
SQL support for union datasources. (#10324) * SQL support for union datasources. Exposed via the "UNION ALL" operator. This means that there are now two different implementations of UNION ALL: one at the top level of a query that works by concatenating subquery results, and one at the table level that works by creating a UnionDataSource. The SQL documentation is updated to discuss these two use cases and how they behave. Future work could unify these by building support for a native datasource that represents the union of multiple subqueries. (Today, UnionDataSource can only represent the union of tables, not subqueries.) * Fixes. * Error message for sanity check. * Additional test fixes. * Add some error messages.
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Druid is a high performance real-time analytics database. Druid's main value add is to reduce time to insight and action.
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