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https://issues.apache.org/jira/browse/SPARK-25407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16610841#comment-16610841
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Michael Allman commented on SPARK-25407:
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I have a code-complete patch for this bug, but I want to add some code comments
before submitting it.
> Spark throws a `ParquetDecodingException` when attempting to read a field
> from a complex type in certain cases of schema merging
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-25407
> URL: https://issues.apache.org/jira/browse/SPARK-25407
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Michael Allman
> Priority: Major
>
> Spark supports merging schemata across table partitions in which one
> partition is missing a subfield that's present in another. However,
> attempting to select that missing field with a query that includes a
> partition pruning predicate the filters out the partitions that include that
> field results in a `ParquetDecodingException` when attempting to get the
> query results.
> This bug is specifically exercised by the failing (but ignored) test case
> https://github.com/apache/spark/blob/f2d35427eedeacceb6edb8a51974a7e8bbb94bc2/sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetSchemaPruningSuite.scala#L125-L131.
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