[Spark] Support type widening during schema evolution in the DSv2 write path#7074
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Description
Support changing column data types during write operations that use the DSv2 code path. With DSv2, Spark is responsible for schema evolution (see the
ResolveSchemaEvolutionrule), and the connector indicates whether a given column change is supported by implementingSupportsSchemaEvolution.Changes:
SupportsSchemaEvolutionfor the Delta DSv2 table (DeltaV2Table). Type changes are accepted when type widening is enabled on the table and no condition prevents changing the column's data type: the column must not be referenced in a generated column expression or a CHECK constraint.ALTER TABLE, which is not yet supported on the DSv2 path.ResolveSchemaEvolutioncalls intoalterTable()to apply changes.How was this patch tested?
Added DSv2 variants of the type widening suites covering schema evolution.