Repository navigation

Issues

[DISCUSSION] 2026 Q3-Q4 Roadmap Discussion
#22882 · alamb opened on Jun 10, 2026
9

Wrong results: a filter on a constant column keeps the row of an aggregate without GROUP BY
apache/datafusion#26545 · opened on Oct 20, 2026
1
Simplify IN lists containing NULL literals under filter semantics in EliminateFilter
apache/datafusion#26542 · opened on Oct 20, 2026
BoundedWindowAggExec has a high fixed cost per partition when partitions are small
apache/datafusion#26541 · opened on Oct 20, 2026
FIRST_VALUE, LAST_VALUE and NTH_VALUE build a ScalarValue for every row
apache/datafusion#26540 · opened on Oct 20, 2026
LAST_VALUE and NTH_VALUE with IGNORE NULLS keep the whole partition buffered
apache/datafusion#26539 · opened on Oct 20, 2026
NTH_VALUE(expr, -n) IGNORE NULLS is quadratic in the partition size
apache/datafusion#26538 · opened on Oct 20, 2026
Memoize LAST_VALUE and NTH_VALUE with IGNORE NULLS so BoundedWindowAggExec can prune its buffer
apache/datafusion#26537 · opened on Oct 20, 2026
LAST_VALUE ... IGNORE NULLS is quadratic in the partition size
apache/datafusion#26532 · opened on Oct 20, 2026
Parquet binary_as_string expands RLE dictionaries before rebuilding them
apache/datafusion#26530 · opened on Oct 20, 2026
TRY_CAST rejects valid struct casts at planning time
Bug
apache/datafusion#26528 · opened on Oct 20, 2026
1
[EPIC] Variant on DataFusion
Feature
apache/datafusion#26517 · opened on Oct 20, 2026
1
optimize_projections fails with "No field named ..." after propagate_empty_relation removes the first branch of a UNION
apache/datafusion#26516 · opened on Oct 20, 2026
CSV ESCAPE option is used when reading but ignored when writing: INSERT/COPY files cannot be read back with the same options (rows merged, backslashes dropped)
Bug
apache/datafusion#26514 · opened on Oct 20, 2026
1
Amortize state compaction in DistinctArrayAggGroupsAccumulator on EmitTo::First
apache/datafusion#26512 · opened on Oct 20, 2026
SQLite parser dialect returns different rows for bitwise filter than SQLite
apache/datafusion#26511 · opened on Oct 20, 2026
partitioning: store start and end bounds in Partitioning::Range
Feature
apache/datafusion#26509 · opened on Oct 19, 2026
1
Wrong results: correlated scalar subquery with nested aggregates
Bug
apache/datafusion#26508 · opened on Oct 19, 2026
1
Named window in HAVING is silently ignored and the query returns results instead of an error
apache/datafusion#26506 · opened on Oct 19, 2026
1
Correlated scalar subquery ignores HAVING that is true for empty input
Bug
apache/datafusion#26505 · opened on Oct 19, 2026
Correlated subquery fails when filtering an aliased derived table on an outer column
Bug
apache/datafusion#26504 · opened on Oct 19, 2026
Correlated scalar subquery with count(*) returns 0 instead of NULL when HAVING references an outer column
Bug
apache/datafusion#26503 · opened on Oct 19, 2026
nth_value and approx_percentile_cont silently ignore DISTINCT
apache/datafusion#26497 · opened on Oct 19, 2026
2
Null-aware NOT IN hash join in Partitioned mode returns rows when the subquery contains NULL
apache/datafusion#26496 · opened on Oct 19, 2026
1
COPY … STORED AS JSON (and INSERT INTO a JSON table) drops every MAP entry whose value is NULL: {color: red, size: NULL} is written as {"color":"red"}
Bug
apache/datafusion#26493 · opened on Oct 19, 2026
1
COPY … PARTITIONED BY writes partition values containing = unescaped (p0=x=y); DuckDB and Polars cannot read the dataset or silently drop the partition column
Bug
apache/datafusion#26492 · opened on Oct 19, 2026
1