v1.5.0 (2026-08-05)

Improvements

• RowBinary inserts with client V2 now stream data directly to the network output stream via the client's
  DataStreamWriter API. Increase in performance is ~ 30% for 100k dataset. (#796)

• Support Avro nullable multi-type unions (e.g. [null, string, int]) mapping to a ClickHouse Variant.
  Confluent's Avro converter turns the non-null branches into a Connect union struct
  (io.confluent.connect.avro.Union), with the null branch making the field optional; the connector
  resolves this to Variant(String, Int32). (#799)

Dependencies

• [build] Updated com.diffplug.spotless from 8.6.0 to 8.9.0.
• [build] Updated gradle-wrapper from 9.5.1 to 9.6.1
• [tests] Updated com.squareup.okhttp3:okhttp from 5.3.2 to 5.4.0.

Bug Fixes

• Fixed issue with Table Schema cache that can remember old schema instead of new one. Now if old
  schema is read proper number of columns is calculated and cache will be properly updated after some time.
  (#813)