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https://issues.apache.org/jira/browse/SPARK-28651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shixiong Zhu reassigned SPARK-28651:
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Assignee: Shixiong Zhu
> Streaming file source doesn't change the schema to nullable automatically
> -------------------------------------------------------------------------
>
> Key: SPARK-28651
> URL: https://issues.apache.org/jira/browse/SPARK-28651
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.4.3
> Reporter: Tomasz
> Assignee: Shixiong Zhu
> Priority: Major
> Labels: release-notes
>
> Right now, batch DataFrame always changes the schema to nullable
> automatically (See this line:
> https://github.com/apache/spark/blob/325bc8e9c6187a96b33a033fbb0145dfca619135/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala#L399).
> However, streaming DataFrame's schema is read in this line
> https://github.com/apache/spark/blob/325bc8e9c6187a96b33a033fbb0145dfca619135/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala#L259
> which doesn't change the schema to nullable automatically.
> We should make streaming DataFrame consistent with batch.
> It can cause corrupted parquet files due to the schema mismatch.
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