Josh Rosen created SPARK-17093:
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Summary: Roundtrip encoding of array<struct<>> fields is wrong
when whole-stage codegen is disabled
Key: SPARK-17093
URL: https://issues.apache.org/jira/browse/SPARK-17093
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.0.0
Reporter: Josh Rosen
Priority: Critical
The following failing test demonstrates a bug where Spark mis-encodes
array-of-struct fields if whole-stage codegen is disabled:
{code}
withSQLConf(SQLConf.WHOLESTAGE_CODEGEN_ENABLED.key -> "false") {
val data = Array(Array((1, 2), (3, 4)))
val ds = spark.sparkContext.parallelize(data).toDS()
assert(ds.collect() === data)
}
{code}
When wholestage codegen is enabled (the default), this works fine. When it's
disabled, as in the test above, Spark returns {{Array(Array((3,4), (3,4)))}}.
Because the last element of the array appears to be repeated my best guess is
that the interpreted evaluation codepath forgot to {{copy()}} somewhere.
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