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

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
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
Parquet bloom filter pruning drops rows holding the other signed zero: WHERE c = 0.0 misses -0.0 rows (and vice versa)
Bug
apache/datafusion#26491 · opened on Oct 19, 2026
1
Plain SELECT of a Parquet float column returns wrong values: NaN rows are replaced by the statistics constant when min == max
Bug
apache/datafusion#26490 · opened on Oct 19, 2026
Physical optimizer drops SortExec below OFFSET when an aggregate consumes the subquery
Bug
apache/datafusion#26488 · opened on Oct 19, 2026
EPIC: Separate optimizer rules from correctness transformation rules
apache/datafusion#26481 · opened on Oct 18, 2026
Support hash-partitioned execution in AsOfJoinExec for memory-bounded joins
Feature
apache/datafusion#26478 · opened on Oct 18, 2026
1
Parquet scans still set up a reader for files whose row groups are all pruned
Bug
apache/datafusion#26475 · opened on Oct 18, 2026
Planning a query with many aggregate or window expressions slows down quadratically
Bug
apache/datafusion#26473 · opened on Oct 18, 2026