Wassim Almaaoui created SPARK-35756:
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Summary: unionByName should support nested struct also
Key: SPARK-35756
URL: https://issues.apache.org/jira/browse/SPARK-35756
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.1.1
Reporter: Wassim Almaaoui
It would be cool if `unionByName` supports also nested struct. I don't kwon if
it's the expected behaviour already or not so I am not sure if its a bug or an
improvement proposal.
{code:java}
case class Struct1(c1: Int, c2: Int)
case class Struct2(c2: Int, c1: Int)
val ds1 = Seq((1, Struct1(1,2))).toDS
val ds2 = Seq((1, Struct2(1,2))).toDS
ds1.union(ds2.as[(Int,Struct1)]) {code}
gives
{code:java}
org.apache.spark.sql.AnalysisException: Union can only be performed on tables
with the compatible column types. struct<c2:int,c1:int> <>
struct<c1:int,c2:int> at the second column of the second table; 'Union false,
false :- LocalRelation [_1#38, _2#39] +- LocalRelation _1#45, _2#46
{code}
The code documentation of the function `unionByName` says `Note that
allowMissingColumns supports nested column in struct types` but doesn't say if
the function itself supports the nested column ordering or not.
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