ydb/yql/essentials/core/common_opt, branch main

YQL-21408: Replace MakeLangVersion with features.json

2026-07-15T12:13:42Z

#### Replace MakeLangVersion with features.json-based feature system ✎ - Introduces a new feature system based on `features.json` to manage language version dependencies instead of hardcoded `MakeLangVersion` calls - Replaces direct language version checks with references to named features defined in JSON configuration - Adds validation and initialization logic for features to ensure version consistency - Updates all existing language version checks to use the new feature-based approach - Centralizes feature version definitions in a single JSON file for better maintainability and clarity Autodescription by Yandex Code Assistant commit_hash:fe9823c0442060337a30186fd957ae294f1aa1c2

YQL-20804: Fix Decimal type conversion

2026-07-15T11:10:17Z

#### `YQL-20804`: Fix Decimal type conversion ✎ - Enhanced type annotation system to properly handle Decimal type conversions by introducing a new `EDecimalConversionMode` configuration option that allows controlling how common types are computed for Decimal values - Modified core type annotation functions to accept and utilize a `TTypeAnnotationContext` parameter, ensuring consistent type resolution across join operations and type conversions - Updated join-related functions and peephole optimizations to pass type context information, fixing issues with Decimal type compatibility during join key processing - Added comprehensive unit tests to verify Decimal type conversion behavior and ensure proper casting between different Decimal precisions and scales - Extended type annotation infrastructure to support both strict and lenient Decimal conversion modes, improving error handling and type inference for edge cases Autodescription by Yandex Code Assistant commit_hash:f4ec01ad79cb2f3219b529118380747828075e6b

YQL-21242: Support Linear types in If branches

2026-07-13T11:46:11Z

#### Поддержка линейных типов в ветках оператора If 📝 - 🔄 Обновлена логика проверки использования линейных значений в ветках оператора `If`, теперь учитывается возможность использования значений в разных ветках и их совместимость по путям выполнения. - 🛠 Добавлена проверка покрытия всех веток для линейных значений, чтобы избежать ситуаций, когда значение не используется на всех возможных путях выполнения. - 🧠 Улучшена система отслеживания использования линейных значений, включая обработку вложенных условий и корректную проверку на повторное использование в одной ветке. - ✅ Внесены изменения в оптимизатор, позволяющие корректно обрабатывать идентичные ветки в операторе `If`, улучшая производительность и корректность работы. - 🧪 Добавлены новые тесты и обновлены существующие для проверки корректности работы с линейными типами в ветках `If` и `IfStrict`. Autodescription by Yandex Code Assistant

Extended TUsageVisitor to track branch execution context. commit_hash:3ec5339a9d4be05580088060917fc7c2996432b9

Push Any in EquiJoin tree

2026-07-06T16:08:27Z

#### Push Any in EquiJoin tree ✎ - Introduces logic to push "Any" hints through EquiJoin tree structures to optimize join operations - Adds support for all join types (Inner, Left, Right, Full, Semi, etc.) when pushing Any hints - Moves PruneKeys functionality to the leaves of EquiJoin tree and enhances its behavior - Implements new optimization passes that improve pruning and hint propagation in join operations - Updates test suite with comprehensive test cases covering various join types and key shapes - Refactors existing code by moving EquiJoin-related optimizations into a dedicated flow step Autodescription by Yandex Code Assistant commit_hash:fda17ab32277b4da545c8df1393eaeb8a7e5c229

YQL-19699: Keep World for AND/OR Absorption

2026-07-03T14:03:53Z

#### `YQL-19699`: Keep World for AND/OR Absorption ✎ - Introduces logic to preserve world information during AND/OR absorption optimizations to prevent incorrect side effect handling - Adds validation to ensure side effects are properly considered when determining if expressions can be safely absorbed - Updates optimization passes to maintain world context in cases where logical absorption would otherwise alter execution semantics - Includes comprehensive test coverage for various side effect scenarios in logical absorption cases - Ensures that optimizations respect the presence of side effects in expressions to maintain correct evaluation order and behavior Autodescription by Yandex Code Assistant commit_hash:5802b1e45ce9c14cafddb9ba5e0356406a6d8fe3

YQL-20095: Tune bugprone-argument-comment

2026-06-30T14:16:39Z

https://clang.llvm.org/extra/clang-tidy/checks/bugprone/argument-comment.html commit_hash:780ff6a63be44998cb2336a05f3dc33e68a676bf

YQL-20095: Enable performance-move-const-arg

2026-06-24T10:13:06Z

https://clang.llvm.org/extra/clang-tidy/checks/performance/move-const-arg.html This check useful, as it shows, when a `std::move` is useless, so to expectations of a programmer are not aligned with reality. The most useful profit is to see `const T&` arguments, that are potentially can be replaced with `T`. Also disabled `CheckTriviallyCopyableMove`, see https://nda.ya.ru/t/Emvgx5Z67fpZY5 why. commit_hash:c80c264a9774721aabbac85b350ccdbb8b9a39a2

YQL-20631: Support WITH CTE columns and fix UNION column order for YqlSelect

2026-06-23T08:17:53Z

Implemented a column names specification for a WITH CTE. It requires a column order derivation. It was not working on `YqlSelect` until PR https://nda.ya.ru/t/qOC3TNqn7gAcy6 was merged. Also there was a bug with `UNION` column order inference, which is essential for RECURSIVE queries. There was compatibility problems with `PgSelect` `UNION` positional column order semantics, so it was tweaked in `YqlSelect` mode. commit_hash:c96192270ca6d51eaa0cb39cf59b65c3951ce3fe

Fix fusing two CalcOverWindow with ExtractMembers in-between

2026-06-12T05:33:30Z

commit_hash:ec04ae964cc2923fe432b2bf75d339459452065a

Fix PayloadRenameOverWindow in overwrite case

2026-06-11T11:41:03Z

commit_hash:867eb4209058a877aa60f86931daddf1e25ac600