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Iceberg partitioned writes fan every task into every partition, so open writers and file count scale with partition cardinality

Status: Open.

#2563 In lakehq/sail;

· Robin-Everaars opened on Sep 8, 2026

[draft] CoalesceExec over Delta MERGE writer input stalls non-zero output partitions

Status: Open.

#2561 In lakehq/sail;

· zemin-piao opened on Sep 8, 2026

Filtering a projected derived column fails with No field named "?table?".resource

Status: Open.

#2560 In lakehq/sail;

· zemin-piao opened on Sep 7, 2026

MERGE INTO ... WHEN MATCHED THEN UPDATE duplicates rows instead of updating them.

Status: Open.

#2548 In lakehq/sail;

· KabirBhutti opened on Sep 4, 2026

Background SparkConnectServer is shut down when the Python handle is garbage collected, causing a silent indefinite hang

Status: Open.

#2530 In lakehq/sail;

· djouallah opened on Sep 1, 2026

Cannot cast Timestamp(Millisecond/Nanosecond/Second, tz) to Spark type when analyzing Parquet schema

Status: Open.

#2519 In lakehq/sail;

· amit-odaia opened on Aug 27, 2026

CASE/if resolve to the type of the first branch instead of the least common type of all branches

Status: Open.

#2503 In lakehq/sail;

· amit-odaia opened on Aug 25, 2026

Python UDFs run inline on the primary runtime, so a saturating UDF batch starves the Spark Connect server

Status: Open.

#2472 In lakehq/sail;

· james-willis opened on Aug 21, 2026

SIGABRT on Linux when the idle-session reaper deletes a session while a Python UDF is in flight

Status: Open.

#2471 In lakehq/sail;

· james-willis opened on Aug 21, 2026

Python UDF execution destroys the PyThreadState after every call, breaking libraries with threading.local-tied native state (use-after-free in pyproj)

Status: Open.

#2456 In lakehq/sail;

· james-willis opened on Aug 19, 2026

DATE + sub-day INTERVAL returns DATE (drops time), Spark returns TIMESTAMP

Status: Open.

#2370 In lakehq/sail;

· vwodaia opened on Aug 5, 2026

Spark SQL Functions Coverage and Parity - Vector

good first issueGood for newcomersGood for newcomers

help wantedExtra attention is neededExtra attention is needed

Status: Open.

#2358 In lakehq/sail;

· lonless9 opened on Aug 5, 2026