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[substrait] Add Placeholder ↔ DynamicParameter support in producer and consumer

Status: Open.

#20971 In apache/datafusion;

· bvolpato opened on Mar 16, 2026

Improve InListExpr types and expectations

enhancementNew feature or requestNew feature or request

Status: Open.

Feature

#20969 In apache/datafusion;

· alamb opened on Mar 16, 2026

feat: Add approx_top_k aggregate function for approximate heavy hitter / top-k frequency estimation

Status: Open.

#20967 In apache/datafusion;

· sesteves opened on Mar 16, 2026

Improve NDV merge to be associative across multiple inputs

enhancementNew feature or requestNew feature or request

Status: Open.

Feature

#20966 In apache/datafusion;

· asolimando opened on Mar 16, 2026

Add MultiDistinctToCrossJoin optimizer rule for parallel distinct aggregates

enhancementNew feature or requestNew feature or request

performanceMake DataFusion fasterMake DataFusion faster

Status: Open.

Feature

#20942 In apache/datafusion;

· Dandandan opened on Mar 14, 2026

Dynamic filter pushdown fails with "Can't compare arrays of different types" when joining VALUES against Dictionary-encoded Parquet columns

bugSomething isn't workingSomething isn't working

regressionSomething that used to work no longer doesSomething that used to work no longer does

Status: Open.

#20937 In apache/datafusion;

· erratic-pattern opened on Mar 13, 2026

String scalar functions should preserve Dictionary encoding for Dictionary-typed inputs

Status: Open.

#20935 In apache/datafusion;

· erratic-pattern opened on Mar 13, 2026

Improve performance of ScalarValue::add

Status: Open.

#20933 In apache/datafusion;

· alamb opened on Mar 13, 2026

Improve DataFusion stability for different batch_size values

bugSomething isn't workingSomething isn't working

Status: Open.

Bug

#20919 In apache/datafusion;

· comphead opened on Mar 12, 2026

[EPIC] Sort-merge join (SMJ) execution improvements

EPICA larger project, actively underway, with sub tasksA larger project, actively underway, with sub tasks

performanceMake DataFusion fasterMake DataFusion faster

physical-planChanges to the physical-plan crateChanges to the physical-plan crate

Status: Open.

#20910 In apache/datafusion;

· mbutrovich opened on Mar 12, 2026

Incorrectly parsed SQL query containing GROUP BY ALL and an alias in the projection

bugSomething isn't workingSomething isn't working

Status: Open.

Bug

#20909 In apache/datafusion;

· drin opened on Mar 12, 2026

DefaultPhysicalExprAdapterRewriter doesn't handle structs inside complex types

bugSomething isn't workingSomething isn't working

Status: Open.

Bug

#20906 In apache/datafusion;

· asubiotto opened on Mar 12, 2026