Issues

• Exact reverse parquet scan counts shared buffers once per batch in its memory reservation

  apache/datafusion#27254 · Filter by author zhuqi-lucas opened on Nov 9, 2026

• Overaggressive pruning of nested fields(?) breaks some valid queries unless parquet pushdown is disabled

  bug
  Bug

  apache/datafusion#27253 · Filter by author ianthetechie opened on Nov 9, 2026
  1

• Aggregate spill: List<Dictionary> state whose values repeat within a group still fails under a memory limit

  bug
  apache/datafusion#27240 · Filter by author andygrove opened on Nov 8, 2026

• Rewrite escaped-regex error checks in sqllogictest files as plain text

  enhancementgood first issue
  apache/datafusion#27239 · Filter by author jayzhan211 opened on Nov 8, 2026
  1

• UPDATE / DELETE fail with "No field named __common_expr_1" when SET or WHERE repeats an expression

  bug
  Bug

  apache/datafusion#27235 · Filter by author v28k opened on Nov 8, 2026

• Blog post about TopK per partition (PartitionedTopKExec / enable_window_topn)

  documentationenhancement
  apache/datafusion#27233 · Filter by author alamb opened on Nov 8, 2026

• Better join support for correlated subqueries: single join, null-aware RightMark, partitioned null-aware joins

  enhancement
  Feature

  apache/datafusion#27229 · Filter by author shehabgamin opened on Nov 8, 2026
  2

• Null-aware hash join loses NOT IN semantics when converted to SymmetricHashJoinExec

  bug
  Bug

  apache/datafusion#27225 · Filter by author shehabgamin opened on Nov 8, 2026

• array_concat of a 2D and a 1D list returns [NULL] or NULL for an all-NULL row depending on the other rows in the batch

  apache/datafusion#27223 · Filter by author raghavyadav01 opened on Nov 8, 2026
  3

• Wrong rows when a partitioned join reorders the keys of an aggregate whose group columns share a name (GROUP BY t1.a, t2.a)

  bug
  apache/datafusion#27221 · Filter by author jayzhan211 opened on Nov 8, 2026
  1

  

• count(*) FILTER (WHERE ...) over an aggregate subquery fails with an internal error from aggregate_statistics

  bug
  apache/datafusion#27220 · Filter by author jayzhan211 opened on Nov 8, 2026
  1

  

• WITH ... AS MATERIALIZED returns wrong rows under ORDER BY ... LIMIT: top-k aggregation limits the shared CTE body

  bug
  apache/datafusion#27219 · Filter by author jayzhan211 opened on Nov 8, 2026
  1

• Wrong results: NOT IN over two unbounded inputs loses its NULL handling (SymmetricHashJoinExec drops null_aware)

  bug
  apache/datafusion#27216 · Filter by author jayzhan211 opened on Nov 8, 2026
  1

  

• Wrong results: = predicate pushed into an IS NOT DISTINCT FROM join matches NULLs

  bug
  apache/datafusion#27215 · Filter by author jayzhan211 opened on Nov 8, 2026
  1

  

• extract(epoch from interval) treats a year as 360 days

  bug
  Bug

  apache/datafusion#27212 · Filter by author darshil929 opened on Nov 7, 2026
  1

• Add awareness of time travel queries to core (VERSION AS OF / TIMESTAMP AS OF)

  apache/datafusion#27209 · Filter by author pepijnve opened on Nov 7, 2026

• Window expressions lose FILTER, IGNORE NULLS and reversal state in physical plan protobuf serialization

  bug
  Bug

  apache/datafusion#27206 · Filter by author shehabgamin opened on Nov 7, 2026

• Blog post for the DataFusion 56.0.0 release

  apache/datafusion#27201 · Filter by author alamb opened on Nov 7, 2026
  

• TopK aggregation keeps the wrong groups when a computed column reuses the aggregate's name

  bug
  apache/datafusion#27195 · Filter by author jayzhan211 opened on Nov 7, 2026
  1

  

• Wrong rows when a subquery's ORDER BY ... LIMIT reads a sorted Parquet file

  bug
  apache/datafusion#27194 · Filter by author jayzhan211 opened on Nov 7, 2026
  1

  

• [Bug] / on integers returns an integer in Spark SQL, Spark always returns a DOUBLE

  bugspark
  apache/datafusion#27187 · Filter by author andygrove opened on Nov 6, 2026

• [Bug] encode accepts charsets and unmappable characters that Spark 4 rejects

  bugspark
  apache/datafusion#27186 · Filter by author andygrove opened on Nov 6, 2026

• [Bug] Spark SQL integer and decimal literals are typed as BIGINT and DOUBLE, Spark uses INT and DECIMAL

  bugspark
  apache/datafusion#27185 · Filter by author andygrove opened on Nov 6, 2026

• array_sum loses precision on integer and decimal arrays

  bug
  Bug

  apache/datafusion#27183 · Filter by author s5dsn-eqee opened on Nov 6, 2026

• Plan changes between runs when an ORDER BY expression uses more than one column not in the SELECT list

  bug
  Bug

  apache/datafusion#27177 · Filter by author shahwazreza opened on Nov 6, 2026
  1