Issues

• Clarification Request: Vacuum's Default Retention Period

  delta-io/delta#7980 · Filter by author bgribaudo opened on Oct 29, 2026

• [BUG][Kernel] A dropped field is rejected as "Cannot drop clustering column" when a clustering column under another parent has the same physical name

  delta-io/delta#7976 · Filter by author shba24 opened on Oct 29, 2026

• [BUG][Storage] Commits from external engines fail against Unity Catalog tables that own clustering (4.3.0 regression)

  bug
  delta-io/delta#7949 · Filter by author shenavaa opened on Oct 25, 2026

• [Feature Request][AWS] Adding support to creation of the metadata in tables in AWS Catalog

  delta-metadatadelta-sparkenhancement
  delta-io/delta#7948 · Filter by author gualtfor opened on Oct 25, 2026

• [Feature Request][Spark] Add a first-class Parquet compression level table property

  delta-metadatadelta-sparkenhancement
  delta-io/delta#7946 · Filter by author berserk-fan opened on Oct 25, 2026
  2

• [BUG][Spark] Excessive write amplification from auto compaction on liquid-clustered tables

  bug
  delta-io/delta#7945 · Filter by author Jiashu2000 opened on Oct 24, 2026
  1

• [Feature Request][Spark] Support lexicographic sort order in OPTIMIZE

  delta-io/delta#7940 · Filter by author berserk-fan opened on Oct 23, 2026

• [BUG][Spark] With ANSI on, partition filters fail on partition values that reads return as null

  bug
  delta-io/delta#7930 · Filter by author gengliangwang opened on Oct 22, 2026

• [Docs] Document spark.databricks.delta.optimize.maxThreads in Compaction (bin-packing) section

  delta-docsdelta-table-maintenancedocumentation
  delta-io/delta#7927 · Filter by author kckoh opened on Oct 22, 2026

• [Feature Request][Spark] Test UC storage credentials with a fake STS client

  enhancement
  delta-io/delta#7896 · Filter by author timothyw553 opened on Oct 16, 2026

• [BUG][Storage] Regression in 4.3.0: UCDeltaTokenBasedRestClient maps HTTP 429 on commit to IOException, so the commit limit never triggers a backfill

  delta-io/delta#7861 · Filter by author shba24 opened on Oct 14, 2026

• [BUG][Spark] Delta Spark 3.3.3 deletion-vector bytecode is incompatible with Java 8

  bugdelta-sparkinfra
  delta-io/delta#7844 · Filter by author gerashegalov opened on Oct 10, 2026
  2

• [BUG][Spark] Generated column using BETWEEN fails with DELTA_UNSUPPORTED_EXPRESSION_GENERATED_COLUMN

  delta-io/delta#7842 · Filter by author maharanay22 opened on Oct 10, 2026

• [BUG][Spark] Python DeltaTable.clone, cloneAtVersion and cloneAtTimestamp return a py4j JavaObject instead of a DeltaTable

  bugdelta-sparkdelta-table-maintenance
  delta-io/delta#7839 · Filter by author maharanay22 opened on Oct 10, 2026

• [BUG] Delta's Unity Catalog client ignores the UC connector's warehouse option and uses the Spark catalog name

  delta-io/delta#7788 · Filter by author sshpuntoff opened on Oct 1, 2026
  

• [BUG][SPARK]VACUUM ... USING INVENTORY rejects tables with non-nullable columns and comments

  bugdelta-sparkdelta-table-maintenance
  delta-io/delta#7735 · Filter by author mik-laj opened on Sep 24, 2026
  4

• [PROTOCOL RFC] Invisible Columns

  delta-metadatadiscussionenhancement
  delta-io/delta#7731 · Filter by author shlokj opened on Sep 24, 2026

• [PROTOCOL RFC] Add DECFLOAT data types

  delta-io/delta#7721 · Filter by author costas-db opened on Sep 22, 2026

• [BUG] [Delta Sharing] Stale DeltaLog cache hit after drop-and-recreate of a shared table

  bug
  delta-io/delta#7646 · Filter by author yabola opened on Sep 11, 2026
  1

• [BUG][Spark]: DeltaSqlParser does not override parsePlanWithParameters, so SQL parameter markers are dropped.

  bugdelta-spark
  delta-io/delta#7640 · Filter by author q-nathangrand opened on Sep 10, 2026
  5

• [BUG][Spark] NULLIF in a generated column fails CREATE and OPTIMIZE on Spark 4.x

  bug
  delta-io/delta#7626 · Filter by author ganeshashree opened on Sep 8, 2026

• [BUG][Spark] replaceUsing on partitioned tables fails with DELTA_FILE_TO_OVERWRITE_NOT_FOUND on local file:// paths

  bugdelta-dml
  delta-io/delta#7577 · Filter by author kosinux opened on Sep 1, 2026
  4

  

• S3 log stores may leave output streams open when action writing fails

  bugdelta-metadatadelta-spark
  delta-io/delta#7573 · Filter by author SauronShepherd opened on Sep 1, 2026
  

• [PROTOCOL RFC] Concurrent Identity Columns (CIC)

  delta-io/delta#7572 · Filter by author mkroll-db opened on Sep 1, 2026
  1

  

• [PROTOCOL RFC] User-Defined Types (UDT)

  delta-io/delta#7559 · Filter by author sanujbasu opened on Aug 31, 2026