Shixiong Zhu created SPARK-28651:
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Summary: 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: Shixiong Zhu
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.
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