Issues

• Evaluate making jemalloc the default allocator for the release build

  enhancementrequires-triage
  apache/datafusion-comet#7344 · Filter by author andygrove opened on Oct 30, 2026
  1

• perf: hll_sketch_agg merge builds a new union for every merged row

  area:aggregationenhancementperformancerequires-triage
  apache/datafusion-comet#7341 · Filter by author comphead opened on Oct 30, 2026

• Native parse_url accepts URLs and registry-based hosts that java.net.URI treats differently

  bugrequires-triage
  apache/datafusion-comet#7330 · Filter by author comphead opened on Oct 30, 2026

• Preserve columnar batches across observations in exchange producer stages

  requires-triage
  apache/datafusion-comet#7324 · Filter by author pingzh opened on Oct 29, 2026
  1

  

• perf: Drop the Spark-planned sort below a Comet partial sort aggregate

  performance
  apache/datafusion-comet#7323 · Filter by author parthchandra opened on Oct 29, 2026
  

• Run filter lambdas natively with DataFusion's array_filter

  enhancementrequires-triage
  apache/datafusion-comet#7321 · Filter by author andygrove opened on Oct 29, 2026

• ci: the docs deploy builds with its dependencies in a job that can write to the repository

  area:cienhancementpriority:lowrequires-triage
  apache/datafusion-comet#7320 · Filter by author andygrove opened on Oct 29, 2026
  1

• ci: a publish_snapshot.yml dry run still passes the Nexus secrets to the build

  area:cienhancementpriority:lowrequires-triage
  apache/datafusion-comet#7319 · Filter by author andygrove opened on Oct 29, 2026
  1

• Evaluate membership key reduction across small shuffle batches

  enhancementperformancerequires-triage
  apache/datafusion-comet#7318 · Filter by author sunchao opened on Oct 29, 2026

• Extend sort-merge membership key reduction to anti joins and eligible conditions

  enhancementperformancerequires-triage
  apache/datafusion-comet#7317 · Filter by author sunchao opened on Oct 29, 2026

• ci: concurrency group is keyed on the branch name, so same-named fork branches can cancel each other's CI

  area:cibugpriority:lowrequires-triage
  apache/datafusion-comet#7315 · Filter by author andygrove opened on Oct 29, 2026

• CapturedSQLConf applies a stale capture inside a SQL execution when every captured key was unset

  area:shufflebugrequires-triage
  apache/datafusion-comet#7312 · Filter by author andygrove opened on Oct 29, 2026
  1

  

• Executor JVM abort (NMT footer canary broken) when the in-memory cache is enabled on Spark 3.4

  area:scanbugrequires-triage
  apache/datafusion-comet#7305 · Filter by author andygrove opened on Oct 28, 2026
  1

  

• JVM columnar shuffle writers use Comet defaults in map stages of jobs outside a SQL execution

  bugrequires-triage
  apache/datafusion-comet#7303 · Filter by author comphead opened on Oct 28, 2026

• [EPIC] Native Spark expressions: run as many Spark built-in expressions as possible natively, by default

  area:expressionsenhancementEPICrequires-triage
  apache/datafusion-comet#7300 · Filter by author andygrove opened on Oct 28, 2026 · 2.0.0
  

• perf: report vectorTypes from the Arrow cached batch serializer

  area:scanenhancementperformancerequires-triage
  apache/datafusion-comet#7298 · Filter by author andygrove opened on Oct 28, 2026 · 1.3.0
  1

  

• perf: store dictionary-encoded columns as dictionaries in the in-memory cache

  area:scanenhancementperformancerequires-triage
  apache/datafusion-comet#7297 · Filter by author andygrove opened on Oct 28, 2026 · 1.3.0

• perf: decode cached batches in native code instead of on the JVM

  area:scanenhancementperformancerequires-triage
  apache/datafusion-comet#7296 · Filter by author andygrove opened on Oct 28, 2026 · 1.3.0

• [EPIC] Iceberg work for 1.3.0: native writes on by default and scan correctness

  area:IcebergEPICrequires-triage
  apache/datafusion-comet#7293 · Filter by author andygrove opened on Oct 28, 2026 · 1.3.0
  

• [EPIC] Comet Native Executors: run Spark queries on native executors built on DataFusion Ballista

  enhancementEPICrequires-triage
  apache/datafusion-comet#7288 · Filter by author andygrove opened on Oct 28, 2026 · 2.0.0
  

• make_date under a codegen-dispatched parent falls back to Spark since #7261

  requires-triage
  apache/datafusion-comet#7284 · Filter by author dwsmith1983 opened on Oct 28, 2026
  2

  

• Offset overflow - Filter merge buffers are not tracked by the memory pool

  bug
  apache/datafusion-comet#7279 · Filter by author parthchandra opened on Oct 27, 2026
  

• Offset overflow - MergeRows and aggregate emit build batches larger than the batch size

  bug
  apache/datafusion-comet#7278 · Filter by author parthchandra opened on Oct 27, 2026
  

• Offset overflow - In-memory table cache ignores spark.comet.batchSize

  bug
  apache/datafusion-comet#7277 · Filter by author parthchandra opened on Oct 27, 2026
  

• Offset overflow - Broadcast exchange merges every batch into one

  bug
  apache/datafusion-comet#7276 · Filter by author parthchandra opened on Oct 27, 2026