Issues

• Native timestamp casts fail or panic for years beyond chrono's range

  requires-triage
  apache/datafusion-comet#7471 · Filter by author tlfua opened on Nov 4, 2026

• Native sort evaluates later sort keys on rows Spark's ordering skips, raising false ANSI errors

  requires-triage
  apache/datafusion-comet#7470 · Filter by author tlfua opened on Nov 3, 2026

• Native Parquet scan reads invalid UTF-8 in nested BINARY values as unvalidated strings on DataFusion 56

  area:scanbugpriority:highrequires-triage
  apache/datafusion-comet#7469 · Filter by author andygrove opened on Nov 3, 2026 · 1.3.0
  

• ANSI: comparisons evaluate the right operand on rows where the left one is NULL

  requires-triage
  apache/datafusion-comet#7468 · Filter by author tlfua opened on Nov 3, 2026

• perf: file open and footer reads dominate native Parquet scan time on TPC-DS q54

  requires-triage
  apache/datafusion-comet#7467 · Filter by author andygrove opened on Nov 3, 2026

• Reduce per-partition overhead for ROW_NUMBER windows

  enhancementrequires-triage
  apache/datafusion-comet#7466 · Filter by author nat-openai opened on Nov 3, 2026

• Comet Native Executors: report each stage's Comet block metrics to Ballista

  enhancementrequires-triage
  apache/datafusion-comet#7465 · Filter by author andygrove opened on Nov 3, 2026

• Native Parquet write falls back on int96RebaseModeInWrite=LEGACY even when timestamps are not written as INT96

  area:writerenhancementrequires-triage
  apache/datafusion-comet#7463 · Filter by author andygrove opened on Nov 3, 2026

• perf: native Parquet scans make two S3 requests for a small file and fetch large merged ranges with one GET

  area:scanenhancementperformancerequires-triage
  apache/datafusion-comet#7459 · Filter by author andygrove opened on Nov 3, 2026
  

• test: no test on main reaches the folded UnsafeArrayData literal fix from #6666

  requires-triage
  apache/datafusion-comet#7458 · Filter by author dwsmith1983 opened on Nov 3, 2026

• Pair the spark-4.2 profile with Delta 4.4 and run the Delta contrib tests on it

  requires-triage
  apache/datafusion-comet#7455 · Filter by author dwsmith1983 opened on Nov 3, 2026
  1

  

• read_side_padding ignores the pad string for dictionary inputs in lpad and rpad

  requires-triage
  apache/datafusion-comet#7453 · Filter by author tlfua opened on Nov 3, 2026

• Native lpad and rpad fail when the length argument is a NULL scalar, such as a scalar subquery that returns no rows

  requires-triage
  apache/datafusion-comet#7452 · Filter by author tlfua opened on Nov 3, 2026

• Comet's TPC-DS speedup is smaller on Spark 4.2.0 than on Spark 4.1.3; investigate and improve Spark 4.2 acceleration

  requires-triage
  apache/datafusion-comet#7451 · Filter by author andygrove opened on Nov 3, 2026
  5

• Iceberg truncate on integers with widths above 2^30: native kernel and native writer compute different partition values

  requires-triage
  apache/datafusion-comet#7442 · Filter by author mbutrovich opened on Nov 2, 2026

• Native Iceberg scan with AQE DPP fails when the DPP build side is a storage-partitioned join

  bugrequires-triage
  apache/datafusion-comet#7441 · Filter by author mbutrovich opened on Nov 2, 2026

• max_by / min_by with variable-length value or ordering types

  enhancementrequires-triage
  apache/datafusion-comet#7440 · Filter by author parthchandra opened on Nov 2, 2026
  

• approx_percentile / percentile_approx on non-numeric input

  enhancementrequires-triage
  apache/datafusion-comet#7439 · Filter by author parthchandra opened on Nov 2, 2026
  

• Native CSV file writes

  enhancementrequires-triage
  apache/datafusion-comet#7438 · Filter by author parthchandra opened on Nov 2, 2026
  

• Native JSON file writes

  enhancementrequires-triage
  apache/datafusion-comet#7437 · Filter by author parthchandra opened on Nov 2, 2026
  

• Native text file writes

  enhancementrequires-triage
  apache/datafusion-comet#7436 · Filter by author parthchandra opened on Nov 2, 2026
  

• percentile with an array of percentages or a frequency argument

  enhancementrequires-triage
  apache/datafusion-comet#7435 · Filter by author parthchandra opened on Nov 2, 2026
  

• Window min / max over string and binary input

  enhancementrequires-triage
  apache/datafusion-comet#7434 · Filter by author parthchandra opened on Nov 2, 2026
  

• Support input_file_name() and input_file_block_* with native scans

  enhancementrequires-triage
  apache/datafusion-comet#7433 · Filter by author parthchandra opened on Nov 2, 2026
  

• Support from_protobuf (ProtobufDataToCatalyst)

  enhancementrequires-triage
  apache/datafusion-comet#7432 · Filter by author parthchandra opened on Nov 2, 2026