pingcap / pingcap/tiflash

split cross join probe return block if need

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type/enhancement
Dominant language
C++
Stars
1k
Forks
423
Avg merge
1d 15h
Merged PRs (30d)
24

Description

Enhancement

Currently, one block in probe side will return one output block after cross joined even thought the block rows may has expanded hundreds times. So once the rows of output block is greater than max_block_size, the block should be returned.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

The issue names no files, tests, or entry points. Start by locating the probe-side cross join implementation and its handling of max_block_size. Done means the probe side returns an output block once expanded rows exceed max_block_size instead of producing one oversized block.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
databases
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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