mirror of https://github.com/apache/druid.git
5cd7610fb6
* 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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| .. | ||
| aggregations.md | ||
| caching.md | ||
| datasource.md | ||
| datasourcemetadataquery.md | ||
| dimensionspecs.md | ||
| filters.md | ||
| granularities.md | ||
| groupbyquery.md | ||
| having.md | ||
| hll-old.md | ||
| joins.md | ||
| limitspec.md | ||
| lookups.md | ||
| multi-value-dimensions.md | ||
| multitenancy.md | ||
| post-aggregations.md | ||
| query-context.md | ||
| query-execution.md | ||
| querying.md | ||
| scan-query.md | ||
| searchquery.md | ||
| segmentmetadataquery.md | ||
| select-query.md | ||
| sorting-orders.md | ||
| sql.md | ||
| timeboundaryquery.md | ||
| timeseriesquery.md | ||
| topnmetricspec.md | ||
| topnquery.md | ||
| virtual-columns.md | ||