sadikovi opened a new pull request, #47292:
URL: https://github.com/apache/spark/pull/47292
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### What changes were proposed in this pull request?
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This PR fixes a bug in a corner case of JSON parsing when
`spark.sql.json.enablePartialResults` is enabled.
When running the following query with the config set to true:
```
select from_json('{"a":"b","c":"d"}', 'array<struct<a:string, c:int>>')
```
the code would fail with
```
org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in
stage 4.0 failed 1 times, most recent failure:
Lost task 0.0 in stage 4.0 (TID 4)
(ip-10-110-51-101.us-west-2.compute.internal executor driver):
java.lang.ClassCastException: class org.apache.spark.unsafe.types.UTF8String
cannot be cast to class
org.apache.spark.sql.catalyst.util.ArrayData
(org.apache.spark.unsafe.types.UTF8String and
org.apache.spark.sql.catalyst.util.ArrayData are in unnamed module of loader
'app')
at
org.apache.spark.sql.catalyst.expressions.BaseGenericInternalRow.getArray(rows.scala:53)
at
org.apache.spark.sql.catalyst.expressions.BaseGenericInternalRow.getArray$(rows.scala:53)
at
org.apache.spark.sql.catalyst.expressions.GenericInternalRow.getArray(rows.scala:172)
at
org.apache.spark.sql.catalyst.expressions.JsonToStructs.$anonfun$converter$2(jsonExpressions.scala:831)
at
org.apache.spark.sql.catalyst.expressions.JsonToStructs.nullSafeEval(jsonExpressions.scala:893)
```
The patch fixes the issue by re-throwing PartialArrayDataResultException if
parsing fails in this special case.
### Why are the changes needed?
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Fixes the bug that would prevent users from reading objects as arrays as
introduced in SPARK-19595. This is more of a special case but it works with the
flag off so it would be good to fix it when the flag is on.
### Does this PR introduce _any_ user-facing change?
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Yes, but it is a bug fix so it would not have worked without this patch
overall.
The parsing output will be different due to the partial results improvement:
Previously, we would get `null` (the partial results are disabled). With
this patch and partial results enabled, this will return `Array([b, null])`.
This is not specific to this patch but rather to the partial results feature in
general.
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I added a unit test.
### Was this patch authored or co-authored using generative AI tooling?
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No.
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