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## Changes in RE2 module {#re2-module}
* Queries are guaranteed to fail when invalid regular expressions are passed.
## Changes in Digest module {#digest-module}
* Added `Digest::Sha512` function
## Changes in SELECT syntax
* Added the ability to explicitly specify `DISTINCT` for `UNION`;
* Implemented `INTERSECT [DISTINCT|ALL]`;
* Implemented `EXCEPT [DISTINCT|ALL]`.
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