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https://issues.apache.org/jira/browse/SPARK-34435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17284434#comment-17284434
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Yousif Majid commented on SPARK-34435:
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Hey [~Enverest], I would like to work on this if that's ok with you!
> ArrayIndexOutOfBoundsException when select in different case
> ------------------------------------------------------------
>
> Key: SPARK-34435
> URL: https://issues.apache.org/jira/browse/SPARK-34435
> Project: Spark
> Issue Type: Bug
> Components: Optimizer, SQL
> Affects Versions: 3.0.1
> Reporter: Enver Osmanov
> Priority: Trivial
>
> h5. Actual behavior:
> Select column with different case after remapping fail with
> ArrayIndexOutOfBoundsException.
> h5. Expected behavior:
> Spark shouldn't fail with ArrayIndexOutOfBoundsException.
> Spark is case insensetive by default, so select should return selected
> column.
> h5. Test case:
> {code:java}
> case class User(aA: String, bb: String)
> // ...
> val user = User("John", "Doe")
> val ds = Seq(user).toDS().map(identity)
> ds.select("aa").show(false)
> {code}
> h5. Additional notes:
> Test case is reproducible with Spark 3.0.1. There are no errors with Spark
> 2.4.7.
> I belive problem could be solved by changing filter in
> `SchemaPruning#pruneDataSchema` from this:
> {code:java}
> val dataSchemaFieldNames = dataSchema.fieldNames.toSet
> val mergedDataSchema =
> StructType(mergedSchema.filter(f => dataSchemaFieldNames.contains(f.name)))
> {code}
> to this:
> {code:java}
> val dataSchemaFieldNames = dataSchema.fieldNames.map(_.toLowerCase).toSet
> val mergedDataSchema =
> StructType(mergedSchema.filter(f =>
> dataSchemaFieldNames.contains(f.name.toLowerCase)))
> {code}
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