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由 Adam Lassek 提交于
Per [this discussion][arel-discussion] on the discourse forum, this is an addition to Arel for supporting `@>` (contains) and `&&` (overlaps) operators in PostgreSQL. They are useful for GIN-indexed data such as a `jsonb` or array column. [arel-discussion]: https://discuss.rubyonrails.org/t/what-has-happened-to-arel/74383/51
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