claudevdm opened a new pull request, #40003:
URL: https://github.com/apache/beam/pull/40003
The user-facing shape of schema evolution for AddFiles, added ahead of the
code that acts on it so the API can be reviewed on its own.
SchemaEvolutionOption is three independent switches: ALLOW_FIELD_ADDITION
(new columns, added optional), ALLOW_FIELD_RELAXATION (a required column
becomes optional when a file may hold nulls in it or lacks it), and
ALLOW_TYPE_PROMOTION (widening along Iceberg's rules). They constrain columns
the table already has; a column new in a window takes the union of that
window's file schemas.
SchemaEvolutionConfig is a Serializable AutoValue. With no options it is
disabled and files register as before this series. Pins (getRequiredColumns)
are dotted column paths that are never relaxed and are created required; a
Parquet file that cannot prove they hold no nulls goes to the error output.
IncompatibleSchemaHandling picks FAIL_PIPELINE (batch only, the batch default)
or ROUTE_TO_ERRORS (the streaming default) for a file schema the options cannot
cover.
build() trims pins, rejects blank ones, and rejects pins or a handling set
without an option, so neither can be silently ignored.
**Please** add a meaningful description for your change here
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