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https://issues.apache.org/jira/browse/AVRO-3257?focusedWorklogId=694470&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-694470
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ASF GitHub Bot logged work on AVRO-3257:
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Author: ASF GitHub Bot
Created on: 11/Dec/21 20:29
Start Date: 11/Dec/21 20:29
Worklog Time Spent: 10m
Work Description: opwvhk commented on a change in pull request #1411:
URL: https://github.com/apache/avro/pull/1411#discussion_r767190931
##########
File path:
lang/java/compiler/src/main/javacc/org/apache/avro/compiler/idl/idl.jj
##########
@@ -182,6 +183,32 @@ public class Idl implements Closeable {
return result;
}
+ /**
+ * For "optional schemas" (recognized by the marker property the NullableType
+ * production adds), ensure the null schema is in the right place.
+ *
+ * @param schema a schema
+ * @param defaultValue the intended default value
+ * @return the schema, or an optional schema with null in the right place
+ */
+ private static Schema fixOptionalSchema(Schema schema, JsonNode
defaultValue) {
Review comment:
The main problem is a) union instances must still have the default value
match the first schema (I don't know enough to relax that constraint), and b)
the union will not be what was written.
As a result, my preference is to restrict this feature to the `?` syntax.
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Issue Time Tracking
-------------------
Worklog Id: (was: 694470)
Time Spent: 2h 10m (was: 2h)
> IDL: add syntax to create optional fields
> -----------------------------------------
>
> Key: AVRO-3257
> URL: https://issues.apache.org/jira/browse/AVRO-3257
> Project: Apache Avro
> Issue Type: Improvement
> Components: java, spec
> Reporter: Oscar Westra van Holthe - Kind
> Assignee: Oscar Westra van Holthe - Kind
> Priority: Minor
> Labels: javacc, pull-request-available
> Fix For: 1.11.1
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> To define optional values, Avro has the "union with the null type"
> construction.
> In IDL, this is a rather verbose construct:
> {code}
> union {null, string} optionalName = null;
> {code}
> Wish: add Kotlin style optional types like this:
> {code}
> string? optionalName = null;
> {code}
> The resulting schema should be identical; it's only a syntax change.
> Note: it would be nice (but not required) if the syntax would also work if
> the default value is not null:
> {code}
> string? optionalName = "Jane Doe";
> {code}
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