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serenedb

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serenedb
The First Real-Time Search Analytics Database

C++ · 761 stars

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Catalog split follow-ups: one catalog WAL as on main, parallel inverted-index recovery and commit, indexed-expression projection Open

serenedb/serenedb#1208 · 1 assignee · Opened Sep 21, 2026
Learned sparse retrieval: keep the model's weight instead of dropping it Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1198 · Opened Sep 19, 2026
Posting format: separate metadata from payload, starting with positions Open

feature perf student-task

serenedb/serenedb#1197 · 1 comment · 1 assignee · Opened Sep 19, 2026
ann: derive index configuration from the data instead of exposing knobs Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

serenedb/serenedb#1194 · Opened Sep 18, 2026
iresearch_scan: recognise nearest-neighbour joins and per-group top-k instead of falling back to a scan Open

feature perf

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1193 · Opened Sep 18, 2026
hnsw: build edges that survive a filter, instead of working around exclusions at query time Open

feature student-task

Difficulty 5/5 Over a week Newbie friendliness 30/100

serenedb/serenedb#1192 · Opened Sep 18, 2026
hnsw: put the codes a hop needs next to the links, instead of scattered Open

feature perf student-task

Difficulty 5/5 Over a week Newbie friendliness 32/100

serenedb/serenedb#1191 · Opened Sep 18, 2026
ivf: widen the probe set when the chosen clusters were not enough Open

feature perf

Difficulty 5/5 Over a week Newbie friendliness 45/100

serenedb/serenedb#1190 · Opened Sep 18, 2026
ivf: compare the routing tree against a centroid graph and a product codebook Open

feature

serenedb/serenedb#1189 · 1 comment · 1 assignee · Opened Sep 18, 2026
ivf: search a large posting with a graph instead of scanning it Open

feature perf

serenedb/serenedb#1188 · 1 comment · 1 assignee · Opened Sep 18, 2026
ivf: skip postings a filter has already emptied, at the centroid rather than per document Open

feature perf

Difficulty 4/5 3-5 days Newbie friendliness 45/100

serenedb/serenedb#1187 · Opened Sep 18, 2026
ivf: anisotropic centroids (AVQ) and orthogonal multi-assignment (SOAR) Open

feature perf

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1186 · Opened Sep 18, 2026
ivf: quantize the centroid layer, and read full precision only when an entry can still win Open

feature perf

Difficulty 5/5 Over a week Newbie friendliness 30/100

serenedb/serenedb#1185 · Opened Sep 18, 2026
ivf: reuse centroids on merge instead of retraining the tree Open

feature perf

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1184 · Opened Sep 18, 2026
Join order: DPhyp falls back to greedy on most topologies, and never tries DP past 12 relations Open

feature perf student-task

serenedb/serenedb#1182 · 2 comments · 1 assignee · Opened Sep 17, 2026
sqllogictest-rs: loop constructs and concurrent testing inside a single file Open

feature student-task

serenedb/serenedb#1181 · 1 comment · 1 assignee · Opened Sep 17, 2026
Sketches as values: storable, mergeable approximate aggregates Open

feature student-task

serenedb/serenedb#1180 · 1 comment · 1 assignee · Opened Sep 17, 2026
BM25F and MultiSimilarity: scoring across fields and combining models Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 25/100

serenedb/serenedb#1179 · Opened Sep 17, 2026
The axiomatic similarity family, and property tests for the axioms themselves Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 28/100

serenedb/serenedb#1178 · Opened Sep 17, 2026
DFR and IB: the two parameterised similarity frameworks Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1177 · Opened Sep 17, 2026
Alternatives to IVF for on-disk vector search: DiskANN, on-disk graphs, inline storage Open

feature perf student-task

Difficulty 5/5 Over a week Newbie friendliness 30/100

serenedb/serenedb#1176 · 2 comments · Opened Sep 17, 2026
Allow a lambda stage without parentheses in the middle of an analyzer chain Open

feature

serenedb/serenedb#1175 · 1 assignee · Opened Sep 17, 2026
Allow user-defined functions in `sql` tokenizer stages Open

feature good first issue

Difficulty 5/5 Over a week Newbie friendliness 38/100

serenedb/serenedb#1174 · Opened Sep 17, 2026
quant: what to store per vector — an error bound, a correction, or neither Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1172 · 2 comments · Opened Sep 17, 2026
hnsw: order node ids by graph locality so a neighbour gather stops being 32 random reads Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1171 · Opened Sep 16, 2026
sq: block layout (PDX / fastscan) and Panorama for the IVF scan Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1170 · Opened Sep 16, 2026
BM25 top-k reads threads x k rows of stored columns before the global LIMIT (60 s cold at 10B) Open

perf

Difficulty 4/5 3-5 days Newbie friendliness 56/100

serenedb/serenedb#1163 · Opened Sep 14, 2026
Carry "one term per document" into the filter optimizer Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

serenedb/serenedb#1162 · Opened Sep 14, 2026
Dedupe count(DISTINCT join key) before the join: rewrite to DISTINCT + SEMI join Open

perf

Difficulty 5/5 Over a week Newbie friendliness 45/100

serenedb/serenedb#1161 · Opened Sep 14, 2026
Search-table INSERT buffers the whole statement in memory when the pipeline is not parallel (OOM) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1160 · 1 comment · 1 assignee · Opened Sep 14, 2026
Reduce a document's occurrences by max, not sum, for phrase distance and n-gram similarity Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

serenedb/serenedb#1158 · Opened Sep 13, 2026
Move serene-ui to apps/serene-ui Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

serenedb/serenedb#1155 · Opened Sep 12, 2026
Move the sqlite sqllogictest corpus to a submodule fork of upstream Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

serenedb/serenedb#1154 · Opened Sep 12, 2026
Remove flex/bison: rewrite the Lucene parser on DuckDB's PEG parser Open

good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 25/100

serenedb/serenedb#1153 · Opened Sep 12, 2026
Search: what is still worth doing Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

serenedb/serenedb#1141 · Opened Sep 10, 2026
EXPLAIN: qualify the table with database and schema when they are not the current ones Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

serenedb/serenedb#1140 · Opened Sep 10, 2026
Make RE2 faster: literal prefilters, SIMD and no-regex fast paths Open

feature perf student-task

serenedb/serenedb#1139 · 1 comment · 1 assignee · Opened Sep 9, 2026
Index Euclidean geometry (non-geographic CRS) on multi-dimensional curve terms Open

feature student-task

serenedb/serenedb#1137 · 1 comment · 1 assignee · Opened Sep 9, 2026
ASCII fast paths for the ICU-backed word segmentation and for sentence segmentation Open

feature perf student-task

serenedb/serenedb#1136 · 1 comment · 1 assignee · Opened Sep 9, 2026
Write a Snowball-grammar compiler that emits optimised C++ instead of portable C Open

feature perf student-task

serenedb/serenedb#1135 · 1 comment · 1 assignee · Opened Sep 9, 2026
Student tasks 2026/2027 Open

feature student-task

Difficulty 5/5 Over a week Newbie friendliness 25/100

serenedb/serenedb#1134 · 20 comments · Opened Sep 9, 2026
Validate our tokenizers against other engines, and close the gaps that turn up Open

feature student-task

serenedb/serenedb#1133 · 1 comment · 1 assignee · Opened Sep 9, 2026
delta-rs: read Delta Lake tables through the transaction log Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1132 · 1 comment · Opened Sep 9, 2026
Vortex: read path and a measured verdict against Parquet Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 32/100

serenedb/serenedb#1131 · 1 comment · Opened Sep 9, 2026
Rust in the build: one mechanism for first-party crates and for Rust inside vendored extensions Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1130 · 1 comment · Opened Sep 9, 2026
read_pdf: text and tables out of PDFs Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1129 · Opened Sep 9, 2026
read_gsheet: query a Google Sheet live Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1128 · Opened Sep 9, 2026
read_xlsx: query spreadsheets without exporting to CSV Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 38/100

serenedb/serenedb#1127 · Opened Sep 9, 2026
read_html: extract tables from real-world HTML pages Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 35/100

serenedb/serenedb#1126 · Opened Sep 9, 2026
read_xml: streaming XML to rows, and the mapping problem Open

feature good first issue student-task

Difficulty 5/5 Over a week Newbie friendliness 25/100

serenedb/serenedb#1125 · Opened Sep 9, 2026

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