ydb/yql, branch main

YQL-21350: Limit SQLv1 parse tree depth

2026-07-21T18:39:47Z

Copy of https://nda.ya.ru/t/ceJZ5osd7jHYXe. commit_hash:07f1b0533bb4ba214af84233eee20c113010fa09

YQL-20631: Warn on WITH CTE name mismatch

2026-07-21T15:12:31Z

A warning on WITH CTE column names specification and corresponding select column order mismatch was introduced. It is not complete, because there can be autogenerated columns (e.g. `column0`, `column1`) and now there is no way to get if they are autogenerated or user-specified, so there is a regex heuristic now. Good implementation requires passing a new attribute from a translator and a lot of recanonization. I can do it, but propose to make it in a separate PR. Also there was a problem of repetitive warning emission, because of "Type Annotation (repeat)". A classical approach with `Warn` suffix is not very useful in SqlSelect, because its type annotation is so huge and has a lot of `Repeat`s. So I found a solution in introduction of a new attribute `warnings`, where warning ids are stored in an atom list, so lookup in this list does the deduplication. commit_hash:e67198223e224ef80ff2bf48d6d9bb7bbe3f264a

Intermediate changes

2026-07-21T10:56:05Z

commit_hash:3fb2a704bbe1b994e96732b714bfc635e78b78aa

Remove deprecated functions

2026-07-21T09:20:52Z

#### Remove deprecated type conversion functions ✎ - Removed deprecated overloaded functions for type conversion and inference that accepted `bool useTypeDiff` parameter - Updated all related function signatures to use `TTypeAnnotationContext` instead of separate `bool useTypeDiff` flag - Eliminated redundant function variants that were kept for backward compatibility - Simplified the API by removing obsolete parameters and maintaining only the modern approach with type context - Improved code clarity and reduced maintenance overhead by removing deprecated code paths Autodescription by Yandex Code Assistant commit_hash:a724ae6debe4207ec05a2907b85f9c2bf4f07394

Intermediate changes

2026-07-20T20:42:09Z

commit_hash:469502ac214838a72fed41d91ea10b4f420379a4

YQL-21081: Limit strip IO via stdout pipe

2026-07-17T19:25:51Z

**Description:** Use stdout pipe with optional pv bandwidth limit for strip operation instead of direct disk write. ### Важно: `> strip /usr/bin/ls -o /dev/stdout | pv > dst ` `strip: /dev/stdout[.interp]: Illegal seek` \| не умеет работать с pipe! "Оператор конвейра (`|`) создает **канал (pipe)**, который является последовательным потоком данных и **не поддерживает** операцию произвольного поиска (`lseek`)" В ПР делаю запись в `dev/shm/` - это запись в оперативную память, должно быть гораздо быстрее чем на диск. \+ Я вставил исключение, если утилита не найдена. commit_hash:3bad6eebafe7a1af56a7909d1954c76d2d9c98b5

YQL-21372, fixed switch data multiplication, fixed hanging of DQ stages with multi output, refactor switch state handling

2026-07-17T16:06:51Z

Adjusted LLVM code for switch Refactored switch state, and fixed: 1. Stop processing once the active handler is finished. Previously, `Switch` could continue reading from input and forwarding `Yield` even after all handlers had already completed, for example with `Take `. 2. Do not finish prematurely when input is finished. If input returned `Finish`, the handler could still produce final `Yield`/data before completing. `Switch` now waits for the handler to fully drain instead of dropping the final output. 3. Preserve buffered input when handler yields early. If a handler returned `Yield` before consuming the whole input buffer, the remaining buffered data could be skipped after switching. This is now handled correctly. 4. Handle repeated `Yield` from input correctly. Previously, after sending `Yield`, the read index could be reset immediately in the handler. If the handler did not produce its own `Yield`, the same input could be reread, producing incorrect results. This case is now covered and fixed. Also fixed previously reverted hanging when switch produce extra yields. Refactoring request: commit_hash:ef7fd73dbdee60d33c384b6d6b505ad7bee20458

YQL-21315: Block variant item implementation

2026-07-17T15:57:11Z

BlockVariantItem implementation commit_hash:f35a597dee3dc67ebc5be599ed9d379d7ad57802

pass streaming constraints inside switch

2026-07-17T10:12:17Z

Added streaming constraint passing for switch: * If input has streaming constraint -- all child lambdas also get streaming constraint on input (because joined variant stream may not finish) commit_hash:0da119f104179a5c93d9a6752876d3d1e3a63637

Add GENERATED ALWAYS AS syntax

2026-07-17T10:08:59Z

#### Add GENERATED ALWAYS AS syntax support ✎ - Introduces support for GENERATED ALWAYS AS column syntax in CREATE TABLE and ALTER TABLE statements, including both STORED and VIRTUAL variants - Adds parsing and semantic validation for generated columns, ensuring they are only supported for YDB provider and table types - Extends SQL grammar with new keywords and rules to handle generated column definitions and expressions - Implements proper highlighting and formatting for GENERATED ALWAYS AS syntax across different language parsers - Includes comprehensive test coverage for various generated column scenarios, including expressions, nested paths, and error conditions - Adds validation to prevent usage in external tables, tablestores, and non-YDB providers Autodescription by Yandex Code Assistant commit_hash:cb2260d56b17f0d8e9044dcebc59a25147e85bd6