Problemsby GlyphRAG on Polars returns irrelevant or missing context
2 posts from 2 people2d activeSteady, +1 this weekunverified
Posts per day
The posts behind it
Streaming group by could exploit a sorted prefix of composite grouping keys
### Description Thank you for the streaming engine - it has been transformative for my work. Could streaming group-by exploit a known sorted prefix of its grouping keys? For mean/count on `(date, entity_id)`, the engine could hash within each active date partition and finalize...
Support large `Map`s in Parquet/Arrow
...the entries buffer whole and the offsets absolute, so a few-element slice of a big map fails to export even though it holds almost no entries -- and the Parquet writer hits this on its own, because it splits row groups by slicing. ### 2. A single Polars chunk holds 2^31+ entries...
Companies and products named
About this problem
Evidence
2 posts from 2 people in 1 place, about 1 a week over 58 days. Mostly on pola-rs/polars. 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 "rag-retrieval" rule about Polars. First post Sep 3, 2026, latest Oct 30, 2026. Unverified: fewer than 3 posts, or one person or place only. Method
The same problem elsewhere
RAG retrieval returns irrelevant or missing context
18 posts from 18 people on Reddit, GitHub issues, Hacker News.
RAG on GitHub returns irrelevant or missing context
10 posts from 8 people on GitHub issues, Reddit.
RAG on LangChain returns irrelevant or missing context
8 posts from 7 people on Reddit, GitHub issues, Stack Overflow.
RAG on Anthropic returns irrelevant or missing context
4 posts from 4 people on GitHub issues, Reddit.
RAG on Llama returns irrelevant or missing context
3 posts from 2 people on Stack Overflow, Reddit.
RAG on LlamaIndex returns irrelevant or missing context
3 posts from 3 people on GitHub issues.
RAG on vLLM returns irrelevant or missing context
3 posts from 3 people on GitHub issues.
RAG on Claude returns irrelevant or missing context
3 posts from 3 people on Reddit, GitHub issues.
RAG on OpenAI returns irrelevant or missing context
3 posts from 3 people on GitHub issues.
RAG on PyTorch returns irrelevant or missing context
3 posts from 3 people on GitHub issues, Mastodon.
RAG on Qdrant returns irrelevant or missing context
3 posts from 2 people on GitHub issues.
RAG on Chroma returns irrelevant or missing context
2 posts from 2 people on GitHub issues. Unverified.
Other Polars problems
Trouble with Polars column
Top post: "Lazy join returns wrong data when a suffixed column (id_right) has the same name as the right join key", one of 17 posts from 13 people on GitHub issues.
Trouble with Polars unique
Top post: "Streaming engine: multi-column `.unique()` in `group_by().agg()` much slower than in-memory", one of 7 posts from 4 people on GitHub issues.
Trouble with Polars returns
Top post: "GPU `max_horizontal` returns NaN for a finite value followed by NaN", one of 3 posts from 2 people on GitHub issues.
Polars users keep filing bugs
Top post: "Consider upgrading the brotli crate (CVE-2026-111497)", one of 22 posts from 15 people on GitHub issues.
Trouble with Polars group
Top post: "Datetime out-of-range in `group_by_dynamic` streaming engine", one of 4 posts from 3 people on GitHub issues.
Polars upgrades break working setups
23 posts from 16 people on GitHub issues.
Trouble with Polars parquet
Top post: "`is_in` with more than 100 values does not skip Parquet row groups between the values", one of 7 posts from 7 people on GitHub issues.
Trouble with Polars join
Top post: "Coalescing full join on Int32-vs-Int64 keys with `unique` incorrect", one of 6 posts from 6 people on GitHub issues.
Trouble with Polars instead
Top post: "Series.to_list() panics on out-of-range datetimes instead of raising an error", one of 6 posts from 6 people on GitHub issues.
Bad data slips through Polars unnoticed
3 posts from 3 people on GitHub issues, Reddit.
Polars runs out of memory
3 posts from 3 people on GitHub issues.
Trouble with Polars read
Top post: "`read_database` raises `ImportError` with SQLAlchemy 2.1 when `greenlet` is not installed", one of 3 posts from 3 people on GitHub issues.
History