Tidb: PCP: Vectorize the merge join executor

Created on 25 Dec 2019 · 5Comments · Source: pingcap/tidb

Description

Currently, the merge join executor in TiDB is row-based, which compares and joins data from its children row by row.
We can vectorize it to let it do the processing group by group like what we do in the stream aggregation executor.
You can use the vecGroupChecker to find the next group.

Difficulty

Medium

Score

3000

Mentor(s)

@SunRunAway
@XuHuaiyu
@qw4990

Recommended Skills

Go programming

PCP difficultmedium statuhelp-wanted typenhancement

Source

qw4990

Most helpful comment

Hi, @catror
Do you have any ideas or plans to do this PCP, we can make a meeting to discuss it along with @XuHuaiyu and @qw4990 if you have time.

I'm busy these days. But I'm almost done with this issue, please expect a PR this weekend.

catror on 7 Jan 2020

🎉3

All 5 comments

/pick-up-challenge

catror on 31 Dec 2019

@catror pick up issue success

sre-bot on 31 Dec 2019

🎉2

Hi, @catror
Do you have any ideas or plans to do this PCP, we can make a meeting to discuss it along with @XuHuaiyu and @qw4990 if you have time.

SunRunAway on 7 Jan 2020

Hi, @catror
Do you have any ideas or plans to do this PCP, we can make a meeting to discuss it along with @XuHuaiyu and @qw4990 if you have time.

I'm busy these days. But I'm almost done with this issue, please expect a PR this weekend.

catror on 7 Jan 2020

🎉3

Hi @catror , thanks for your contribution!
Do you use Slack? I'd like to discuss this issue with you on Slack more detailly before you open a PR 😺.

qw4990 on 7 Jan 2020

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