ClickHouse / ClickHouse/clickhouse-java

Support all Aggregate Functions as parameter for columns of type AggregateFunction

Open
#1,232 7 comments 1 reaction 0 assignees View on GitHub
area:data-type enhancement jdbc-v2
Dominant language
Java
Stars
1.6k
Forks
636
Avg merge
2d 23h
Merged PRs (30d)
29

Description

Currently, only [groupBitmap](https://clickhouse.com/docs/en/sql-reference/aggregate-functions/reference/groupbitmap) is [supported](https://github.com/ClickHouse/clickhouse-java/blob/d175cd7d0e8f0427a8e2bc1b20c597990cd507b4/clickhouse-data/src/main/java/com/clickhouse/data/format/ClickHouseRowBinaryProcessor.java#L510-L515) as parameter for a table column of type [AggregateFunction](https://clickhouse.com/docs/en/sql-reference/data-types/aggregatefunction/).

It would be good if [all](https://clickhouse.com/docs/en/sql-reference/aggregate-functions/reference/) aggregate functions are supported.

Contributor guide

Open the contributing guide

Research direction

Inspect ClickHouseRowBinaryProcessor.java around lines 510-515 and review the AggregateFunction and aggregate-function reference documentation. Check merged pull request #1345 and the current implementation first; done means supported AggregateFunction column parameters cover the requested aggregate functions without breaking existing handling.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
databases
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
25/100

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