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https://issues.apache.org/jira/browse/SPARK-60413?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Szehon Ho reassigned SPARK-60413:
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Assignee: Szehon Ho
> Warn when evolving a DSv2 table that accepts any schema
> -------------------------------------------------------
>
> Key: SPARK-60413
> URL: https://issues.apache.org/jira/browse/SPARK-60413
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 5.0.0
> Reporter: Szehon Ho
> Assignee: Szehon Ho
> Priority: Major
> Labels: pull-request-available
>
> DSv2 tables can advertise both AUTOMATIC_SCHEMA_EVOLUTION and
> ACCEPT_ANY_SCHEMA. Automatic schema evolution applies requested schema
> changes during write analysis, while ACCEPT_ANY_SCHEMA skips Spark's native
> write schema resolution and alignment. A write can consequently fail after
> the table schema has been updated; a nontransactional catalog retains those
> changes.
> Add a warning immediately before Spark applies pending schema changes to a
> table reporting both capabilities. Identify the data source and table,
> explain the risk, and suggest disabling ACCEPT_ANY_SCHEMA. Emit the warning
> once for the batch of changes. Writes without pending evolution, or tables
> reporting only one capability, should remain quiet.
> Cover INSERT and MERGE through public DataFrame write APIs, including exact
> warning counts and persistent schema changes after a failed MERGE.
> Related connector discussion: https://github.com/apache/iceberg/pull/17957
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