Issues

• Hydrate Pydantic models nested in collections when reading datasets

  datachain-ai/datachain#2007 · Filter by author ilongin opened on Sep 28, 2026
  

• Preserve aliases when hydrating nested Pydantic model collections

  datachain-ai/datachain#2003 · Filter by author ilongin opened on Sep 28, 2026
  

• Top-level Pydantic model unions read back as dictionaries

  datachain-ai/datachain#2002 · Filter by author ilongin opened on Sep 28, 2026

• Introducing URL type

  enhancement
  datachain-ai/datachain#1984 · Filter by author dmpetrov opened on Sep 9, 2026

• A model and a plain value serialize by different rules

  datachain-ai/datachain#1968 · Filter by author shcheklein opened on Aug 30, 2026

• Union types: collection arms (Union[str, list[str]])

  datachain-ai/datachain#1952 · Filter by author dmpetrov opened on Aug 24, 2026

• Unify deprecation warnings behind one helper

  datachain-ai/datachain#1950 · Filter by author dmpetrov opened on Aug 23, 2026

• Drop the legacy numeric _type_tag (arm index) layout

  datachain-ai/datachain#1949 · Filter by author dmpetrov opened on Aug 23, 2026

• Validation accepts annotations that storage cannot honour

  datachain-ai/datachain#1942 · Filter by author shcheklein opened on Aug 19, 2026

• Read path: values do not come back as their declared type

  datachain-ai/datachain#1918 · Filter by author shcheklein opened on Aug 17, 2026

• dict signals with mixed str/non-str key types silently lose data on save

  datachain-ai/datachain#1914 · Filter by author shcheklein opened on Aug 16, 2026
  1

• Nested pydantic models lose their class identity in another process

  bugpriority-p1
  datachain-ai/datachain#1910 · Filter by author dmpetrov opened on Aug 16, 2026

• Implement HDF5 file type

  enhancementpriority-p2
  datachain-ai/datachain#1909 · Filter by author dmpetrov opened on Aug 15, 2026

• Implement lag / lead window functions

  enhancementpriority-p2
  datachain-ai/datachain#1908 · Filter by author dmpetrov opened on Aug 15, 2026

• select() silently drops hidden fields such as etag

  bugpriority-p3
  datachain-ai/datachain#1907 · Filter by author dmpetrov opened on Aug 15, 2026
  2

• "Invalid etag" on a stale local listing does not name the fix, and prints mtime as a hex float

  bug
  datachain-ai/datachain#1906 · Filter by author dmpetrov opened on Aug 15, 2026

• VideoFragment.save() silently overwriting across source directories

  bugpriority-p2
  datachain-ai/datachain#1905 · Filter by author dmpetrov opened on Aug 15, 2026

• Agg/Map-er constructor state is not part of the UDF hash - 2nd call returns the 1st call's rows.

  bugpriority-p1
  datachain-ai/datachain#1903 · Filter by author dmpetrov opened on Aug 15, 2026

• Unpin numkong on macOS once upstream ships 7.7.1+ wheels

  datachain-ai/datachain#1874 · Filter by author shcheklein opened on Jul 21, 2026

• Support None items in lists of models and nested lists (remaining cases of #1440)

  bugpriority-p2
  Bug

  datachain-ai/datachain#1873 · Filter by author shcheklein opened on Jul 21, 2026
  1

• Custom model name collisions: same-named generated models shadow each other across datasets

  bugpriority-p2
  datachain-ai/datachain#1872 · Filter by author shcheklein opened on Jul 21, 2026

• Catalog needs a database-identity contract for early cross-catalog validation

  datachain-ai/datachain#1864 · Filter by author shcheklein opened on Jul 17, 2026

• Support account in az:// URIs

  enhancement
  datachain-ai/datachain#1859 · Filter by author dmpetrov opened on Jul 15, 2026

• Make pip install work out of the box for major modalities

  enhancement
  datachain-ai/datachain#1852 · Filter by author dmpetrov opened on Jul 11, 2026

• Explicit output for tuple-returning UDFs

  enhancement
  datachain-ai/datachain#1851 · Filter by author dmpetrov opened on Jul 11, 2026