rdblue commented on code in PR #12238:
URL: https://github.com/apache/iceberg/pull/12238#discussion_r1955075130
##########
core/src/test/java/org/apache/iceberg/avro/TestAvroSchemaProjection.java:
##########
@@ -150,4 +150,58 @@ public void projectWithMapSchemaChanged() {
.as("Result of buildAvroProjection is missing some IDs")
.isFalse();
}
+
+ @Test
+ public void projectWithVariantSchemaChanged() {
+ final org.apache.avro.Schema currentAvroSchema =
+ SchemaBuilder.record("myrecord")
+ .fields()
+ .name("f11")
+ .type()
+ .nullable()
+ .intType()
+ .noDefault()
+ .endRecord();
+
+ final org.apache.avro.Schema variantSchema =
+ SchemaBuilder.record("v")
+ .fields()
+ .name("metadata")
+ .type()
+ .bytesType()
+ .noDefault()
+ .name("value")
+ .type()
+ .bytesType()
+ .noDefault()
+ .endRecord();
+ Variant.get().addToSchema(variantSchema);
+
+ final org.apache.avro.Schema updatedAvroSchema =
+ SchemaBuilder.record("myrecord")
+ .fields()
+ .name("f11")
+ .type()
+ .nullable()
+ .intType()
+ .noDefault()
+ .name("f12")
+ .type(variantSchema)
+ .noDefault()
+ .endRecord();
+
+ final Schema currentIcebergSchema =
AvroSchemaUtil.toIceberg(currentAvroSchema);
+
+ // Getting the node ID in updatedAvroSchema allocated by converting into
iceberg schema and back
+ final org.apache.avro.Schema idAllocatedUpdatedAvroSchema =
+
AvroSchemaUtil.convert(AvroSchemaUtil.toIceberg(updatedAvroSchema).asStruct());
+
+ final org.apache.avro.Schema projectedAvroSchema =
+ AvroSchemaUtil.buildAvroProjection(
+ idAllocatedUpdatedAvroSchema, currentIcebergSchema,
Collections.emptyMap());
+
+ assertThat(AvroSchemaUtil.missingIds(projectedAvroSchema))
+ .as("Result of buildAvroProjection is missing some IDs")
+ .isFalse();
Review Comment:
I don't think this is sufficient to test changes to `BuildAvroProjection`.
For that class, we need to test that the variant can be selected. This asserts
that all of the projected fields (regardless of whether a variant was
projected) have IDs. And I don't think that the variant would be projected
because the `expected` schema is a conversion from the "current" Avro schema
that doesn't have the variant field.
There should be a test case that projects the variant field. I also
recommend having fewer schemas. You only need 3: an Iceberg schema for all
fields, that Iceberg schema converted to Avro (representing a file schema), and
an Iceberg schema that projects the Variant field (produced using
`schema.select`).
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