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Support subcolumns in projections.

comp-projections

feature

jsonIssues and pull-requests related to the new JSON data typeIssues and pull-requests related to the new JSON data type

Status: Open.

#86809 In ClickHouse/ClickHouse;

· KochetovNicolai opened on Sep 8, 2025

Projections return stale data after materialized column modification

comp-projections

potential bugTo be reviewed by developers and confirmed/rejected.To be reviewed by developers and confirmed/rejected.

Status: Open.

#86742 In ClickHouse/ClickHouse;

· xoelop opened on Sep 5, 2025

Logical Error: Block structure mismatch in UnionStep stream (due to a projection)

bugConfirmed user-visible misbehaviour in official releaseConfirmed user-visible misbehaviour in official release

comp-projections

fuzzProblem found by one of the fuzzersProblem found by one of the fuzzers

Status: Open.

#83614 In ClickHouse/ClickHouse;

· PedroTadim opened on Jul 11, 2025

Cannot clone block with columns, because block ... has 2 columns, but 0 columns given

bugConfirmed user-visible misbehaviour in official releaseConfirmed user-visible misbehaviour in official release

comp-projections

fuzzProblem found by one of the fuzzersProblem found by one of the fuzzers

Status: Open.

#80415 In ClickHouse/ClickHouse;

· alexey-milovidov opened on May 18, 2025

Optimise window functions to use projections, where applicable

comp-projections

feature

Status: Open.

#76845 In ClickHouse/ClickHouse;

· jwhitaker-gridcog opened on Feb 27, 2025

Projections is not used with count(if()) aggregations containing alias columns

comp-projections

performance

Status: Open.

#69008 In ClickHouse/ClickHouse;

· EugeniyPetrov opened on Aug 28, 2024

Projections not being used when SELECT...FINAL query is made

comp-projections

unexpected behaviour

Status: Open.

#62542 In ClickHouse/ClickHouse;

· gnerqrt opened on Apr 11, 2024

Clickhouse is not using projection when sorting by primary index

comp-projections

feature

performance

Status: Open.

#58912 In ClickHouse/ClickHouse;

· Blackmorse opened on Jan 17, 2024

[Umbrella] Projections Reliability Improvements

comp-projections

Status: Open.

#58099 In ClickHouse/ClickHouse;

· melvynator opened on Dec 21, 2023

alter table move partition: projection folder is moved to a table which has no DDL of it

comp-projections

unexpected behaviour

Status: Open.

#51657 In ClickHouse/ClickHouse;

· mkabilov opened on Jun 30, 2023

simple count queries are slow after lightweight deletes

comp-mutationsALTER UPDATE/DELETEALTER UPDATE/DELETE

comp-optimizersQuery optimizationsQuery optimizations

comp-projections

feature

performance

Status: Open.

#47930 In ClickHouse/ClickHouse;

· filimonov opened on Mar 23, 2023

Unexpected scan when using projections + order by on replacingmergetree

comp-projections

unexpected behaviour

Status: Open.

#47333 In ClickHouse/ClickHouse;

· luca-nardelli opened on Mar 8, 2023