Jose Torres created SPARK-27253:
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Summary: SparkSession clone discards SQLConf overrides in favor of
SparkConf defaults
Key: SPARK-27253
URL: https://issues.apache.org/jira/browse/SPARK-27253
Project: Spark
Issue Type: Bug
Components: Structured Streaming
Affects Versions: 2.4.0
Reporter: Jose Torres
SparkSession.cloneSession() is normally supposed to create a child session
which inherits all the SQLConf values of its parent session. But when a SQL
conf is given a global default through the SparkConf, this does not happen; the
child session will receive the SparkConf default rather than its parent's
SQLConf override.
This is particularly impactful in structured streaming, as the microbatches run
in a cloned child session.
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