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https://issues.apache.org/jira/browse/GOBBLIN-933?focusedWorklogId=337605&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-337605
]
ASF GitHub Bot logged work on GOBBLIN-933:
------------------------------------------
Author: ASF GitHub Bot
Created on: 01/Nov/19 23:07
Start Date: 01/Nov/19 23:07
Worklog Time Spent: 10m
Work Description: ahmedahamid commented on pull request #2792:
[GOBBLIN-933] add support for array of unions in json schema
URL: https://github.com/apache/incubator-gobblin/pull/2792#discussion_r341779189
##########
File path: gobblin-core/src/test/resources/converter/jsonToAvroRecord.json
##########
@@ -1,4 +1,6 @@
-{"nullableField": null,
+{
+ "arrayFieldWithUnion": ["arrU1", "arrU2", "arrU3"],
Review comment:
Just following up. I tried adding a `null` value to this array but the
`JsonRecordAvroSchemaToAvroConverterTest.testConverter` failed:
```java
Could not convert field arrayFieldWithUnion
org.apache.gobblin.converter.DataConversionException: Could not convert
field arrayFieldWithUnion
at
org.apache.gobblin.converter.avro.JsonRecordAvroSchemaToAvroConverter.convertNestedRecord(JsonRecordAvroSchemaToAvroConverter.java:127)
at
org.apache.gobblin.converter.avro.JsonRecordAvroSchemaToAvroConverter.convertRecord(JsonRecordAvroSchemaToAvroConverter.java:71)
at
org.apache.gobblin.converter.avro.JsonRecordAvroSchemaToAvroConverterTest.testConverter(JsonRecordAvroSchemaToAvroConverterTest.java:69)
...
Caused by: java.lang.RuntimeException: Field: arrayFieldWithUnion is not
nullable and contains a null value
at
org.apache.gobblin.converter.avro.JsonElementConversionFactory$JsonElementConverter.convert(JsonElementConversionFactory.java:278)
at
org.apache.gobblin.converter.avro.JsonElementConversionWithAvroSchemaFactory$ArrayConverter.convertField(JsonElementConversionWithAvroSchemaFactory.java:98)
at
org.apache.gobblin.converter.avro.JsonElementConversionFactory$JsonElementConverter.convert(JsonElementConversionFactory.java:280)
at
org.apache.gobblin.converter.avro.JsonRecordAvroSchemaToAvroConverter.convertNestedRecord(JsonRecordAvroSchemaToAvroConverter.java:125)
... 51 more
```
I think the key issue here is that `UnionConverter`'s does not determine its
nullability correctly; it uses the nullability it receives from
`JsonElementConversionWithAvroSchemaFactory.getConvertor()` to decide its own
nullability. This is incorrect because `arrayFieldWithUnion` is a non-nullable
array. However, the union itself (i.e. `UnionConverter`) would return `false`
if you invoke `isNullable()` on it because it is construing
`arrayFieldWithUnion`'s non-nullability as its own (see the values
`UnionConverter` provides to `super`).
One possible fix could be to have `UnionConverter` override `isNullable()`
so it can decide its own nullability based on its schemas, e.g.
```java
@Override
public boolean isNullable() {
return this.firstSchema.getType() == Schema.Type.NULL ||
this.secondSchema.getType() == Schema.Type.NULL;
}
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 337605)
Time Spent: 50m (was: 40m)
> JsonRecordAvroSchemaToAvroConverter does not handle arrays of unions
> --------------------------------------------------------------------
>
> Key: GOBBLIN-933
> URL: https://issues.apache.org/jira/browse/GOBBLIN-933
> Project: Apache Gobblin
> Issue Type: Bug
> Reporter: Ahmed Abdul Hamid
> Priority: Major
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Using {{JsonRecordAvroSchemaToAvroConverter}} to convert an array of a union
> type fails. For instance, using it with the following Avro schema:
> {code:java}
> {
> "name": "arrayField",
> "type": {
> "type": "array",
> "items": ["string", "null"]
> }
> } {code}
> yields the following error:
> {code:java}
> java.lang.StackOverflowError
> at org.apache.gobblin.configuration.State.getProp(State.java)
> at
> org.apache.gobblin.configuration.WorkUnitState.getProp(WorkUnitState.java:333)
> at
> org.apache.gobblin.converter.avro.JsonElementConversionFactory.getConvertor(JsonElementConversionFactory.java:106)
> at
> org.apache.gobblin.converter.avro.JsonElementConversionFactory$UnionConverter.getConverter(JsonElementConversionFactory.java:737)
> at
> org.apache.gobblin.converter.avro.JsonElementConversionFactory$UnionConverter.<init>(JsonElementConversionFactory.java:729)
> at
> org.apache.gobblin.converter.avro.JsonElementConversionFactory.getConvertor(JsonElementConversionFactory.java:160)
> at
> org.apache.gobblin.converter.avro.JsonElementConversionFactory$UnionConverter.getConverter(JsonElementConversionFactory.java:737)
> at
> org.apache.gobblin.converter.avro.JsonElementConversionFactory$UnionConverter.<init>(JsonElementConversionFactory.java:729)
> {code}
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