the-other-tim-brown commented on code in PR #18190:
URL: https://github.com/apache/hudi/pull/18190#discussion_r2805489279
##########
hudi-common/src/main/java/org/apache/hudi/common/schema/HoodieSchema.java:
##########
@@ -80,14 +80,40 @@
* @since 1.2.0
*/
public class HoodieSchema implements Serializable {
+ private static final long serialVersionUID = 1L;
/**
* Constant representing a null JSON value, equivalent to
JsonProperties.NULL_VALUE.
* This provides compatibility with Avro's JsonProperties while maintaining
Hudi's API.
*/
public static final Object NULL_VALUE = JsonProperties.NULL_VALUE;
public static final HoodieSchema NULL_SCHEMA =
HoodieSchema.create(HoodieSchemaType.NULL);
- private static final long serialVersionUID = 1L;
+ /**
+ * Constant to use when attaching type metadata to external schema systems
like Spark's StructType.
+ */
+ public static final String TYPE_METADATA_FIELD = "hudi_type";
Review Comment:
For these custom types, we should look into whether we can create a to/from
string. So we can build the schema from some string representation. Similar to
how `Decimal(10,5)` will translate to a decimal with the provided precision and
scale values.
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