Hyukjin Kwon created SPARK-61022:
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             Summary: Ask the server whether a DataFrame is streaming in 
isStreaming of the Python client as PySpark does
                 Key: SPARK-61022
                 URL: https://issues.apache.org/jira/browse/SPARK-61022
             Project: Spark
          Issue Type: Bug
          Components: Connect
    Affects Versions: connect-rust-4.3.0
            Reporter: Hyukjin Kwon


In PySpark Connect, {{df.isStreaming}} asks the server 
({{AnalyzePlanRequest.is_streaming}}), which is true for a DataFrame with a 
streaming source anywhere in its plan: 
{{spark.readStream.format("rate").load().select("value").isStreaming}} is True, 
as are the filters, unions and joins of a streaming DataFrame.

The Rust-backed Python client checks only whether the root of the plan is a 
streaming read, so {{isStreaming}} is False for those DataFrames. Ask the 
server as PySpark does.




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