Fix for NOT_FOUND_COLUMN_IN_BLOCK when selecting from projections

[yariks5s]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes into CHANGELOG.md):

Fixes NOT_FOUND_COLUMN_IN_BLOCK cases where the projection SELECT part has columns that do not exist in the original SELECT part of the query. Closes #100194

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

[clickhouse-gh]

Workflow [PR], commit [684be9b]

Summary: ✅

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AI Review

Summary

This PR fixes a real correctness issue in projection optimization with row policies: projection-specific SelectQueryInfo now clears row_level_filter to avoid trying to evaluate row-policy actions against projection blocks that may not contain all source columns, while keeping effective filtering through the merged filter_actions_dag. The added stateless test covers both projection paths (DistinctStep and AggregatingStep) and reproduces the original NOT_FOUND_COLUMN_IN_BLOCK scenario. High-level verdict: the fix is targeted, consistent across normal and aggregate projection optimizations, and safe.

Missing context

• ⚠️ No CI results/logs were provided in the review input, so this review is based on code and tests in the diff.

ClickHouse Rules

Item	Status	Notes
Deletion logging	➖
Serialization versioning	➖
Core-area scrutiny	✅
No test removal	✅
Experimental gate	➖
No magic constants	✅
Backward compatibility	✅
SettingsChangesHistory.cpp	➖
PR metadata quality	✅
Safe rollout	✅
Compilation time	✅

Final Verdict

• Status: ✅ Approve

[clickhouse-gh]

LLVM Coverage Report

Metric	Baseline	Current	Δ
Lines	84.10%	84.10%	+0.00%
Functions	24.60%	24.50%	-0.10%
Branches	76.70%	76.70%	+0.00%

PR changed lines: PR changed-lines coverage: 100.00% (18/18, 0 noise lines excluded)
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