Problemsby GlyphClickHouse schema changes break downstream pipelines
2 posts from 1 person2d activeFading, +0 this weekunverified
Posts per day
The posts behind it
Iceberg filter on a reused column name prunes old files by wrong column
### Describe what's wrong - Filtering on a column whose name was reused by schema evolution silently drops rows from old data files. - Trigger: drop a column, rename another column onto the dropped name, then query that name with `WHERE`. - `SELECT *` returns rows correctly, but...
Column `ALTER` during unregistered `ALTER UPDATE` leaves mutation queue stuck
...then `RENAME COLUMN v TO w`. - The `UPDATE` should apply or be refused; instead it keeps failing with `NO_SUCH_COLUMN_IN_TABLE` and the `RENAME` mutation never finishes. - With default `alter_sync` the `RENAME` hangs holding the alter lock, so later `ALTER`s fail with...
Companies and products named
About this problem
Evidence
2 posts from 1 person in 1 place, about 1 a week over 22 days. Mostly on ClickHouse/ClickHouse. Tools named alongside: GitHub.
Frustration Frustration 0 of 3· Seen on GitHub issues
How it was grouped
Posts that state a pain and match the "schema-drift" rule about ClickHouse. First post Oct 12, 2026, latest Nov 2, 2026. Unverified: fewer than 3 posts, or one person or place only. Method
The same problem elsewhere
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History