default to merge append instead of fast append

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Quiet
Tech stack
python
Domain
data-engineering

Research direction

Start with the linked devlist discussion to understand why merge append should become the default and what metadata-management behavior is expected. Then locate the append entry point and its current fast-append default in the PyIceberg codebase. Done means the default uses merge append and the relevant behavior is covered by tests.

Written by the indexing model from the issue text.

Description

devlist discussion: https://lists.apache.org/thread/sk1j4jo6s7ntr880tt7ktdt636nwzt5n

Merge append is better for metadata management

Dominant language
Python
Stars
1.1k
Forks
589
Avg merge
2d 4h
Merged PRs (30d)
72

Contributor guide

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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.

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