mirror of https://github.com/apache/druid.git
16817e408d
* SQL + Expressions = Best friends forever. - Use expressions as a projection layer for anything that can't be expressed using traditional Druid extractionFns. Sometimes they're embedded directly (like "expression" filters, builtin aggregators, or "expression" post-aggregators). Sometimes they're referenced through virtual columns (like dimensionSpecs, which can't innately reference functions of more than one column without the virtual column layer). - Add many new functions and operators, taking advantage of the expression capability (see the querying/sql.md doc). - Improve consistency of constant reduction and of casting by using Druid expressions for this instead of Calcite's RexExecutor. * Fix casting bug, and other code review comments. * Fix docs. |
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