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fix: alter table add column id alloc mismatch #4972

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merged 8 commits into from
Nov 13, 2024

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discord9
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@discord9 discord9 commented Nov 11, 2024

I hereby agree to the terms of the GreptimeDB CLA.

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What's changed and what's your intention?

Fix a bug when altering a metric table and add a already existing columns in physical table caused column_id mismatch,
which would cause datafusion to panic in certain condition, related sqlness tests are also added

Please explain IN DETAIL what the changes are in this PR and why they are needed:

Bug Explain

The bug is:

  1. Two metrics tables have been created that share a single physical table.
  2. Table A has added a column named "at", with a column ID of 1.
  3. After some time, Table B attempts to add the "at" column:
    • It uses the column_semantic_type function to check and finds that it does not have this column, so it adds it to the columns_to_add list.
    • It sends an alter request to Mito, specifying the column definition as ("at" String null Tag 2), knowing that the maximum column ID is 1.
    • Mito receives the request and discovers that the "at" column already exists (as seen in store_api::metadata::RegionMetadataBuilder::add_columns). It ignores the request, does not add the column to the physical table, and does not return an error.
    • The metrics engine, not receiving an error, assumes the column addition was successful and adds ("at" String null Tag 2) to the logical table.
  4. At this point, the column ID for "at" is seen as 1 in both Table A and the physical table, while Table B sees it as 2.

Solution is to check physical region for actual column_id(and other metadata) to update to logical region

Checklist

  • I have written the necessary rustdoc comments.
  • I have added the necessary unit tests and integration tests.
  • This PR requires documentation updates.

@discord9 discord9 requested review from waynexia, evenyag and a team as code owners November 11, 2024 13:17
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@github-actions github-actions bot added the docs-not-required This change does not impact docs. label Nov 11, 2024
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codecov bot commented Nov 11, 2024

Codecov Report

Attention: Patch coverage is 81.39535% with 8 lines in your changes missing coverage. Please review.

Project coverage is 83.81%. Comparing base (0e0c4fa) to head (bf558d0).
Report is 10 commits behind head on main.

Additional details and impacted files
@@            Coverage Diff             @@
##             main    #4972      +/-   ##
==========================================
- Coverage   84.07%   83.81%   -0.27%     
==========================================
  Files        1143     1143              
  Lines      211918   212639     +721     
==========================================
+ Hits       178172   178213      +41     
- Misses      33746    34426     +680     

tests/cases/standalone/common/alter/alter_table.sql Outdated Show resolved Hide resolved
src/metric-engine/src/data_region.rs Outdated Show resolved Hide resolved
tests/cases/standalone/common/alter/alter_table.sql Outdated Show resolved Hide resolved
src/metric-engine/src/metadata_region.rs Outdated Show resolved Hide resolved
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@waynexia waynexia left a comment

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💯

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@fengjiachun fengjiachun left a comment

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LGTM

@fengjiachun fengjiachun added this pull request to the merge queue Nov 13, 2024
Merged via the queue into GreptimeTeam:main with commit 175fddb Nov 13, 2024
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3 participants