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* YQL-21315: Implement block guessatarasov52026-06-261-0/+134
#### Implement BlockGuess functionality for variant type extraction ✎ - Introduces BlockGuess functionality to extract specific alternatives from variant types, supporting both tuple and struct variants - Adds type annotation and runtime implementation for BlockGuess operations with proper validation and error handling - Implements peephole optimization support for BlockGuess operations to improve query execution plans - Includes comprehensive unit tests and SQL format validation for various BlockGuess scenarios - Updates runtime version to 79 to enable new BlockGuess features and ensures backward compatibility <a href="https://nda.ya.ru/t/qa0kX64r7DqvtN"><font size="2">Autodescription by Yandex Code Assistant</font></a> commit_hash:e8f7fc2859cc1986ee0d5fba8b3e25bbf9ba4c41