Problemsby GlyphTrouble with Apache Iceberg table
12 posts from 8 people6d activeFading, +0 this week
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Parquet files written with the "default" CRS are not compatible with Iceberg Java EPSG:4326 table
### Apache Iceberg version main (development) ### Query engine None ### Please describe the bug 🐞 After https://github.com/apache/iceberg/pull/17578, Parquet types are validated against the Iceberg type. This is great! In an attempt to reduce the number of readers that had to...
SQL: `PARTITION BY` in `CREATE TABLE` for Iceberg catalog tables
### Description Support a partition spec in `CREATE TABLE` on an attached Iceberg catalog. Expected: the table is created with that partition spec (Iceberg's `year`, `month`, `day`, `hour`, `bucket(N, col)` and `truncate(W, col)` transforms), and the rows of `AS SELECT` are...
Core: Expiring unused schemas and adding a column in one transaction leaves REST table metadata unloadable
...and only schema 0. The `ops.current()` call at the end of `CatalogHandlers.commit` then fails to read it back: The client sees a failed commit, but the metadata pointer has already moved, so every later `loadTable` fails with the same error. The partition spec version (add a...
Parity gap: SQL time travel on an Iceberg table (FOR VERSION AS OF / FOR SYSTEM_TIME AS OF)
...`FOR SYSTEM_TIME AS OF '2100-01-01 00:00:00'` and `VERSION AS OF ` fail to parse as well. `polars-sql` already refuses a parsed version qualifier with "table version (time-travel) qualifiers are not supported". Expected: the query reads the table as of that snapshot (or...
System table functions enumerate every schema even when the query pins one — O(schemas) RPCs on remote catalogs
...currently have none, so it is a design decision rather than a local change. ### Aside: hard to diagnose from the outside Neither `SET enable_http_logging=true` (no file produced) nor `SET enable_logging=true; SET enabled_log_types='HTTP'` followed by `SELECT * FROM duckdb_logs`...
SQL: CREATE TABLE in an Iceberg catalog
### Description I would like `CREATE TABLE` in Polars SQL to create a real table in an Iceberg catalog. Today `CREATE TABLE` only registers a frame in the `SQLContext`. Nothing is written to a catalog. Expected: the table exists in the catalog, and other engines (Spark, DuckDB)...
SQL: INSERT INTO an Iceberg table
### Description I would like Polars SQL to support `INSERT INTO`, with `VALUES` and with `SELECT`, and to commit the rows to an Iceberg table. Today `INSERT` is not supported at all: `statement type is not supported`. Expected: one append commit to the Iceberg table per...
SQL: DROP TABLE in an Iceberg catalog
### Description I would like `DROP TABLE` in Polars SQL to drop the table from an Iceberg catalog. Today `DROP TABLE` only removes the name from the `SQLContext`. The table stays in the catalog. `DROP ... PURGE` is refused. Expected: the table is gone from the catalog. With...
SQL: DELETE FROM an Iceberg table
### Description I would like `DELETE FROM ... WHERE ...` in Polars SQL to delete the rows in an Iceberg table and commit. Today `DELETE` only returns a filtered frame. Nothing is written to the table. Expected: one commit to the Iceberg table (delete files, or rewritten data...
Procedure for re-wrapping table encryption keys
### Feature Request / Improvement All encryption keys in a table, except for the master key, are wrapped (encrypted) by a parent key. Some security protocols require periodic re-wrapping with a fresh version of the parent keys. The period is typically long, one year or above. We...
Server abort on SELECT from Iceberg table with unparsable sort-order transform
### Describe what's wrong - Reading an Iceberg table aborts the server process with SIGABRT during query analysis, before any data is read - Trigger is a `sort-orders` field whose transform string ClickHouse cannot parse, for example `bucket[xyz]` in `metadata.json` - Expected a...
`rewrite_table_path` produces an unreadable copy of an encrypted table
### Apache Iceberg version None ### Query engine None ### Please describe the bug 🐞 Currently, `rewrite_table_path` produces an unreadable copy of an encrypted table. The procedure completes normally and returns a file list, but reading the registered target fails: Root cause:...
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About this problem
Evidence
12 posts from 8 people in 4 places, about 2 a week over 52 days. Mostly on pola-rs/polars, apache/iceberg, ClickHouse/ClickHouse. Tools named alongside: GitHub, DuckDB, Polars, ClickHouse.
Frustration Frustration 0 of 3· Seen on GitHub issues
How it was grouped
Posts about Apache Iceberg with no known issue, sharing the word "table". First post Sep 7, 2026, latest Oct 28, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
Other Apache Iceberg problems
Apache Iceberg users keep filing bugs
Top post: "ORC: Writer accepts an empty struct that reader cannot bind", one of 11 posts from 10 people on GitHub issues, Reddit.
Trouble with Apache Iceberg spark
Top post: "Spark: WAP snapshot isolation broken for format-version 3 tables when deletion vectors are used (spark.wap.id)", one of 7 posts from 7 people on GitHub issues.
Apache Iceberg upgrades break working setups
6 posts from 5 people on GitHub issues.
Apache Iceberg runs out of memory
4 posts from 3 people on GitHub issues.
Trouble with Apache Iceberg rest
Top post: "Core: Negative delete-file-references in REST scan response cause IndexOutOfBoundsException", one of 4 posts from 3 people on Reddit, GitHub issues.
Apache Iceberg schema changes break downstream pipelines
3 posts from 3 people on GitHub issues.
Apache Iceberg connectors and syncs are fragile
3 posts from 3 people on GitHub issues.
Trouble with Apache Iceberg delete
Top post: "Iceberg DROP PARTITION aborts or republishes parent delete counters after an overwrite snapshot", one of 3 posts from 3 people on GitHub issues.
Trouble with Apache Iceberg tables
Top post: "Iceberg tables are much slower than MergeTree in the performance tests: subcolumns, sort order, join", one of 3 posts from 3 people on GitHub issues.
Bad data slips through Apache Iceberg unnoticed
3 posts from 3 people on GitHub issues.
Apache Iceberg deprecations force unplanned migrations
2 posts from 2 people on GitHub issues. Unverified.
Trouble with Apache Iceberg pruning
Top post: "API: Predicate evaluation and file pruning treat -0.0 and 0.0 as different values", one of 2 posts from 2 people on GitHub issues. Unverified.
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