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https://issues.apache.org/jira/browse/SPARK-59188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-59188:
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Labels: pull-request-available (was: )
> `CatalogV2Util.replace` does not recurse through nested collections
> -------------------------------------------------------------------
>
> Key: SPARK-59188
> URL: https://issues.apache.org/jira/browse/SPARK-59188
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.2.0
> Reporter: Anish Mahto
> Priority: Minor
> Labels: pull-request-available
>
> `CatalogV2Util.replace` handles paths like `["col", "element", "x"]` by
> matching `Seq("element", names @ _*)` against `ArrayType(StructType, _)`, and
> similarly for "key" and "value" with `MapType`.
> However, these multi-segment cases only match when the child type is a
> `StructType`. When the child is another collection -- e.g.
> `ArrayType(ArrayType(...))` or `MapType(_, MapType(...), _)` -- the path
> falls through to the catch-all and throws _LEGACY_ERROR_TEMP_3223.
> Meanwhile, `ResolveSchemaEvolution.computeSchemaChanges` recurses
> unconditionally through collections and emits these paths. The two halves
> disagree: the change emitter produces paths the change applier cannot handle.
> *Example:*
> Schema: `col ARRAY<ARRAY<STRUCT<x: INT>>>`
> `TableChange` produced by `ResolveSchemaEvolution.computeSchemaChanges`:
> `AddColumn(["col", "element", "element", "y"], DoubleType)`
> Expected behavior:
> The path is applied, producing the new schema `col ARRAY<ARRAY<STRUCT<x: INT,
> y: DOUBLE>>>`.
> Actual behavior:
> `IllegalArgumentException: Cannot find field: element in
> array<struct<x:int>>` is thrown
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