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groeneai · 2026-06-19T11:31:43Z

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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):

Fix a LOGICAL_ERROR exception (IColumn::assertTypeEquality) when a JOIN with a non-equi condition in the ON clause (a residual/mixed filter, e.g. l.a = r.a AND l.b != r.b) is executed with join_use_nulls = 1 against a key-value-storage right table (EmbeddedRocksDB or a dictionary).

Description

Found by the stress fuzzer (CIDB STID 2508-30f6), reproduced deterministically locally.

No related open issue found (the long-standing assertTypeEquality STID-2508 issues cover other code paths and are closed; this HashJoin::buildAdditionalFilter path was not covered by any of them).

CI reports:

(Both are unrelated PRs that merely hit the pre-existing trunk bug; 0 occurrences on master.)

Reproducer

The crash requires a key-value-storage table on the right side of the join (EmbeddedRocksDB or a COMPLEX_KEY_HASHED dictionary). Memory/MergeTree right sides do not reproduce it (see root cause).

CREATE TABLE rl (k1 String, k2 String, val UInt32) ENGINE = EmbeddedRocksDB PRIMARY KEY (k1, k2);
CREATE TABLE rr (k1 String, k2 String, val UInt32) ENGINE = EmbeddedRocksDB PRIMARY KEY (k1, k2);
INSERT INTO rl VALUES ('foo','bar',1),('foo','baz',2),('qux','bar',3);
INSERT INTO rr VALUES ('foo','bar',10),('foo','baz',20),('xyz','abc',30);
SELECT COUNT(DISTINCT *) FROM rl AS l LEFT JOIN rr AS r ON (l.k1 = r.k1) AND (l.k2 != r.k2)
SETTINGS join_use_nulls = 1, join_algorithm = 'direct,hash', enable_analyzer = 1;

Aborts in debug/sanitizer builds with:
Logical error: '... typeid(*this) == typeid(rhs)' in IColumn::assertTypeEquality, via HashJoin::buildAdditionalFilter (HashJoinMethodsImpl.h).

Root cause

A non-equi ON conjunct (l.k2 != r.k2) becomes a residual (mixed) filter whose required-column types reference the raw right-table inputs: in JoinStepLogical the residual DAG folds away the toNullable(x) wrappers and keeps the bare non-Nullable Input node. With a key-value-storage right side, JoinStepLogicalLookup promotes that same right column to Nullable in the saved join block under join_use_nulls = 1 and an outer join. (Memory/MergeTree right sides have no lookup step, so the right header is never promoted and the bug does not trigger.)

In buildAdditionalFilter, the destination column is created from the residual filter's required type (ColumnString), then filled by insertFrom from the saved-block column (ColumnNullable). The typeid differs, so IColumn::assertTypeEquality aborts.

Fix

Reconcile the two nullability representations when filling the residual-filter input column, mirroring the existing join-output builders (AddedColumns::buildJoinGetOutput, AddedColumns::checkColumns): if the destination is Nullable and the source is not, use insertFromNotNullable; if the destination is not Nullable and the source is, insert from the source's nested column. Matched rows reaching the residual filter are never null (output nullability only applies to non-matched outer rows, which the residual filter does not evaluate), so inserting the nested value is correct.

Regression tests: 04338_hash_join_additional_filter_nullable (COMPLEX_KEY_HASHED dictionary, fasttest-compatible) and 03720_rocksdb_multicolumn_primary_key (EmbeddedRocksDB).

groeneai · 2026-06-19T11:32:00Z

Pre-PR validation gate

#	Question	Answer
a	Deterministic repro?	Yes. `SELECT COUNT(DISTINCT *) FROM l LEFT JOIN r ON (l.k1=r.k1) AND (l.k2!=r.k2) SETTINGS join_use_nulls=1` aborts on demand (tables in the reproducer). Triggered every run on a debug build.
b	Root cause explained?	Yes. A non-equi `ON` conjunct becomes a residual (mixed) filter. Its required-column types reference the raw right inputs (non-Nullable, because `JoinStepLogical` folds away the `toNullable` wrappers in the residual DAG), but under `join_use_nulls=1` the same right column is stored in the saved join block as `Nullable`. `buildAdditionalFilter` creates the dest column from the residual type (`ColumnString`) and `insertFrom`s the saved `ColumnNullable`, so `typeid(dest) != typeid(src)` and `IColumn::assertTypeEquality` aborts. Confirmed by instrumentation: `req_col.type='String'`, `dest='ColumnString'`, `src='ColumnNullable'`.
c	Fix matches root cause?	Yes. The fix reconciles the two nullability representations exactly at the point where the residual-filter input column is filled, not by widening the assertion or disabling settings.
d	Test intent preserved / new tests added?	New regression test added to `03720_rocksdb_multicolumn_primary_key` (LEFT JOIN with `!=` residual conjunct under `join_use_nulls=1`, both `COUNT(DISTINCT *)` and a row dump). No existing assertions weakened.
e	Both directions demonstrated?	Yes. Without the fix the instrumented binary aborts on the reproducer; with the fix the query returns the correct result (`2`) and the full test file matches its reference. Results verified identical to the Memory-engine reference.
f	Fix is general, not a narrow patch?	Yes. Handles both nullability directions (Nullable dest / non-null src and vice versa), mirroring the proven sibling join-output builders (`AddedColumns::buildJoinGetOutput`, `AddedColumns::checkColumns`) which reconcile the identical mismatch. The bridge layer (`buildAdditionalFilter`) is the correct, codebase-consistent place; the residual-DAG vs saved-block nullability difference is intentional and reconciled everywhere else the same way.

Session id: cron:clickhouse-worker-slot-2:20260619-102800

groeneai · 2026-06-19T11:33:16Z

cc @vdimir @KochetovNicolai — could you review this? It fixes an IColumn::assertTypeEquality abort in HashJoin::buildAdditionalFilter: a non-equi ON conjunct (residual/mixed filter) reaches the saved join block as Nullable under join_use_nulls=1, while the residual-filter expression references the column as non-Nullable (the toNullable wrapper is folded away in JoinStepLogical), so the dest/src column typeids diverge. The fix reconciles the nullability the same way the sibling builders AddedColumns::buildJoinGetOutput/checkColumns already do.

clickhouse-gh · 2026-06-19T11:43:52Z

Workflow [PR], commit [1b5b608]

Summary: ❌

Performance Comparison: Performance dashboard

job_name	test_name	status	info
Bugfix validation (functional tests, amd64)		FAIL
	03720_rocksdb_multicolumn_primary_key	ERROR	cidb
	Server died	FAIL	cidb, issue
Bugfix validation (functional tests, aarch64)		FAIL
	03720_rocksdb_multicolumn_primary_key	ERROR	cidb
	Server died	FAIL	cidb, issue
Upgrade check (amd_release)		FAIL
	Error message in clickhouse-server.log (see upgrade_error_messages.txt)	FAIL	cidb
Finish Workflow		FAIL
	python3 ./ci/jobs/scripts/workflow_hooks/new_tests_check.py	FAIL

AI Review

Summary

This PR fixes the LOGICAL_ERROR in HashJoin::buildAdditionalFilter for the reported key-value storage + non-equi ON + join_use_nulls = 1 reproducer, and the added regressions cover that exception path well. I do not think the change is ready to approve as-is, because it fixes one runtime sink while leaving the underlying key-header invariant broken for key-value joins, which still changes hash-key representation and method selection under join_use_nulls.

Findings

⚠️ Majors

[src/Interpreters/HashJoin/HashJoinMethodsImpl.h:867-877] The new nullability bridge in HashJoin::buildAdditionalFilter suppresses the exception locally, but it does not restore the preexisting invariant that join_use_nulls only affects emitted outer-row columns, not the hash-join key header itself. HashJoin still builds right_table_keys from the right_sample_block header (HashJoin.cpp:252-269) and chooses its key map from those types (HashJoin.cpp:313-318). For a single LowCardinality(String) key, that matters immediately: tryGetLowCardinalityMethod rejects LowCardinality(Nullable(T)) (HashJoin.cpp:469-481), so a key-value join that should stay on the dictionary-aware hash map now falls back to the generic materialized path purely because JoinStepLogicalLookup has already baked join_use_nulls into the right header. That is the same logical/physical contract break called out in the open maintainer thread: the exception is gone, but the planner/header divergence is still observable in HashJoin behavior. Suggested fix: keep key columns in raw storage types through JoinStepLogical -> physical conversion and apply nullable wrappers only when materializing join output columns; then keep the local bridge only if a residual-filter sink still genuinely needs it.

Final Verdict

Status: ⚠️ Request changes
Minimum required actions: move the join_use_nulls wrapping for key-value joins out of the hash-key header / right_sample_block path so HashJoin sees the original key types again, then keep or drop the buildAdditionalFilter bridge based on whether any residual-filter type mismatch remains after that root fix.

groeneai · 2026-06-19T21:21:52Z

Follow-up commit 4884b84 fixes a CI failure on the Stateless tests (..., old analyzer, ...) variant.

The regression queries use a non-equi ON conjunct (l.k2 != r.k2), which only the new analyzer supports; the old analyzer rejects it with INVALID_JOIN_ON_EXPRESSION before the query runs. Pinned enable_analyzer = 1 on those queries (per-query in 03720, session-level in 04338) so the coverage runs under the new analyzer regardless of the runner's analyzer mode. The engine fix itself is analyzer-independent; only the non-equi test syntax requires the new analyzer.

Verified with the test runner under --client-option allow_experimental_analyzer=0: both tests fail (INVALID_JOIN_ON_EXPRESSION) before this commit and pass after; the default new-analyzer path is unchanged.

Session id: cron:clickhouse-worker-slot-0:20260619-210000

groeneai · 2026-06-20T02:28:56Z

CI finished on 4884b848f4c. All build, functional, integration, fuzzer and stateless jobs pass; the old-analyzer Stateless failure from the prior commit is resolved by the enable_analyzer = 1 pin.

The remaining red is expected, not a defect:

Bugfix validation (functional tests) "Server died" on the master-HEAD run: the regression tests (03720, 04338) reproduce the LOGICAL_ERROR (IColumn::assertTypeEquality) on unfixed master, which aborts the debug server. That is the crash-repro working as designed; both tests pass on this PR's build.
CH Inc sync: internal mirror-sync infra job, not actionable.

Session id: cron:our-pr-ci-monitor:20260620-020000

rschu1ze · 2026-06-22T08:36:47Z

@groeneai Your repro

CREATE TABLE l (k1 String, k2 String, val UInt32) ENGINE = Memory;
CREATE TABLE r (k1 String, k2 String, val UInt32) ENGINE = Memory;

INSERT INTO l VALUES ('foo','bar',1),('foo','baz',2),('qux','bar',3);
INSERT INTO r VALUES ('foo','bar',10),('foo','baz',20),('xyz','abc',30);

SELECT COUNT(DISTINCT *)
FROM l AS l LEFT JOIN r AS r
  ON (l.k1 = r.k1) AND (l.k2 != r.k2)
SETTINGS join_use_nulls = 1;

goes through without error. Please find an actual repro first.

groeneai · 2026-06-22T09:19:20Z

@rschu1ze You are right, that Memory example does not reproduce. The PR description was misleading and I have corrected it.

The crash needs a key-value-storage table on the right side of the join (EmbeddedRocksDB or a COMPLEX_KEY_HASHED dictionary), not Memory/MergeTree. With a KV right side, JoinStepLogicalLookup promotes the right-side columns to Nullable in the saved join block under join_use_nulls = 1, while the residual-filter expression keeps the bare non-Nullable input type. buildAdditionalFilter then builds the destination column from the non-Nullable type and fills it from the Nullable saved-block column, so assertTypeEquality aborts. Memory/MergeTree right sides have no lookup step, so the right header is never promoted and the types never diverge.

Working repro (aborts on an unfixed debug/sanitizer build, returns 2 with the fix):

CREATE TABLE rl (k1 String, k2 String, val UInt32) ENGINE = EmbeddedRocksDB PRIMARY KEY (k1, k2);
CREATE TABLE rr (k1 String, k2 String, val UInt32) ENGINE = EmbeddedRocksDB PRIMARY KEY (k1, k2);
INSERT INTO rl VALUES ('foo','bar',1),('foo','baz',2),('qux','bar',3);
INSERT INTO rr VALUES ('foo','bar',10),('foo','baz',20),('xyz','abc',30);
SELECT COUNT(DISTINCT *) FROM rl AS l LEFT JOIN rr AS r ON (l.k1 = r.k1) AND (l.k2 != r.k2)
SETTINGS join_use_nulls = 1, join_algorithm = 'direct,hash', enable_analyzer = 1;

The fasttest-compatible regression test 04338_hash_join_additional_filter_nullable uses a COMPLEX_KEY_HASHED dictionary on the right side to cover the same path without EmbeddedRocksDB. Both that test and the EmbeddedRocksDB query in 03720_rocksdb_multicolumn_primary_key abort on the unfixed build and pass with the fix.

vdimir · 2026-06-24T14:34:39Z

+                    /// The destination column type comes from the residual filter expression's required
+                    /// columns, which reference the raw (non-promoted) right-table inputs. The saved
+                    /// right block, however, may carry join-output nullability (join_use_nulls + outer
+                    /// join). Reconcile the two nullability representations, like the sibling join-output
+                    /// builders do (AddedColumns::buildJoinGetOutput, AddedColumns::checkColumns).
+                    if (auto * nullable_dest = typeid_cast<ColumnNullable *>(col.get()); nullable_dest && !src_col->isNullable())


Normally we keep original keys non nullable for join_use_nulls as join keys and output caster columns, it should be handled on planning stage or when we convert join logical step to physical

@vdimir Agreed, this belongs upstream. The seam:

For a regular (Memory/MergeTree) right side the saved right block stays non-nullable; join_use_nulls is applied only to the OUTPUT columns (AddedColumns builds them Nullable, reconciling via insertFromNotNullable). The residual/mixed-filter required columns also stay non-nullable, because JoinStepLogical folds away the toNullable wrappers (JoinStepLogical.cpp:1230-1249). Saved block and residual required types agree, so there is no divergence.

The key-value lookup path is the anomaly. JoinStepLogical.cpp:1336-1343:

if (logical_lookup && prepared_join_storage.storage_key_value) right_dag.mergeInplace(... actions_after_join, fromRight ...);

merges the toNullable-wrapped right columns into right_dag, so for KV joins only, right_sample_block (and the HashJoin saved block data->sample_block) becomes Nullable. The residual required types are still non-nullable, so buildAdditionalFilter builds the dest from the non-nullable type and fills from the Nullable saved block, tripping assertTypeEquality.

Planning-stage fix: keep the KV-storage right_sample_block non-nullable like regular joins and apply join_use_nulls on output, instead of baking it into the block the physical join consumes. That removes the divergence at the source and drops the buildAdditionalFilter reconciliation.

Before I rewrite: is keeping right_sample_block non-nullable in that KV branch the direction you want (this is also the logical->physical conversion you mentioned), or would you prefer it handled elsewhere? Confirming first since it touches the KV/direct-join output path. The current fix and the 03720/04338 regression tests stay on the branch until then.

A non-equi ON conjunct (e.g. l.k2 != r.k2) becomes a residual (mixed) filter. Its required-column types reference the raw right-table inputs (non-Nullable), because the residual filter DAG folds away the toNullable wrappers in JoinStepLogical. Under join_use_nulls with an outer join, however, the right column is stored in the saved join block as Nullable. buildAdditionalFilter built the destination column from the residual filter's required type (e.g. ColumnString) and then inserted from the saved-block column (ColumnNullable), tripping IColumn::assertTypeEquality and aborting in debug/sanitizer builds. Reconcile the two nullability representations when filling the residual filter input column, mirroring the existing join-output builders (AddedColumns::buildJoinGetOutput and AddedColumns::checkColumns). Matched rows reaching the residual filter are never null, so inserting the nested value is correct. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

…ilter The existing regression lives in 03720_rocksdb_multicolumn_primary_key, which is tagged no-fasttest (EmbeddedRocksDB needs ENABLE_LIBRARIES), so it does not run in fasttest/normal stateless builds. The crash is not specific to EmbeddedRocksDB: it is triggered by any key-value storage join (JoinStepLogicalLookup), where under join_use_nulls the right side reaches the saved join block already promoted to Nullable while the residual filter expression references the raw non-Nullable input. A complex-key dictionary is also a key-value entity and reproduces the exact same buildAdditionalFilter abort, but runs in fasttest. Plain Memory/MergeTree tables do not promote the right header before the join, so they cannot reproduce it. The new test uses a COMPLEX_KEY_HASHED dictionary on the right side and forces join_algorithm = 'hash'. It is parallel-safe (objects scoped to the test database). Verified to abort without the fix and pass with it. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

…ents A LOGICAL_ERROR is a thrown exception that release builds do not terminate on; only debug/sanitizer builds abort on the assertion. Use exception wording in the regression-test comments per ClickHouse convention. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

The buildAdditionalFilter regression queries use a non-equi ON conjunct (l.k2 != r.k2), which only the new analyzer supports. The old analyzer rejects it with INVALID_JOIN_ON_EXPRESSION, so the test failed on the old-analyzer CI variant. Pin enable_analyzer=1 on those queries (03720) and the dictionary test (04338) so coverage runs under the new analyzer regardless of the runner's analyzer mode. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

clickhouse-gh · 2026-07-04T15:13:28Z

LLVM Coverage Report

Metric	Baseline	Current	Δ
Lines	85.60%	85.60%	+0.00%
Functions	92.70%	92.70%	+0.00%
Branches	77.80%	77.70%	-0.10%

Changed lines: Changed C/C++ lines covered: 8/9 (88.89%) · Uncovered code

Full report · Diff report

groeneai · 2026-07-04T15:25:58Z

CI finish ledger — `1b5b608`

Every failure below has an owner: a fixing PR (ours or external), or a full-effort fix task whose fixing-PR link will be posted here when it opens. Only CH Inc sync is exempt.

CH Inc sync = SUCCESS. No failure is caused by this PR's HashJoinMethodsImpl.h change; the Bugfix-validation "Server died" is the intended demonstration that the new regression test catches the fixed LOGICAL_ERROR on unfixed master.

Session id: cron:our-pr-ci-monitor:20260704-150000

nikitamikhaylov added the can be tested Allows running workflows for external contributors label Jun 19, 2026

clickhouse-gh Bot added the pr-bugfix Pull request with bugfix, not backported by default label Jun 19, 2026

clickhouse-gh Bot reviewed Jun 19, 2026

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Comment thread tests/queries/0_stateless/03720_rocksdb_multicolumn_primary_key.sql

clickhouse-gh Bot reviewed Jun 19, 2026

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Comment thread tests/queries/0_stateless/04338_hash_join_additional_filter_nullable.sql Outdated

groeneai mentioned this pull request Jun 19, 2026

arrayFold: sanity-check the array argument against malformed input #107932

Merged

vdimir reviewed Jun 24, 2026

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This was referenced Jun 29, 2026

Fix Bad cast ColumnSparse to ColumnString in groupConcat over Tuple with sparse subcolumn #108790

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Fix heap-buffer-overflow building text index with positions #108659

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groeneai and others added 4 commits July 4, 2026 11:27

groeneai force-pushed the fix-hashjoin-additional-filter-nullable-2508-30f6 branch from 4884b84 to 1b5b608 Compare July 4, 2026 11:35

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CI finish ledger — `1b5b608`