[SPARK-11877] Prevent agg. fallback conf. from leaking across test suites #9857
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This patch fixes an issue where the
spark.sql.TungstenAggregate.testFallbackStartsAtSQLConf setting was not properly reset / cleared at the end ofTungstenAggregationQueryWithControlledFallbackSuite. This ended up causing test failures in HiveCompatibilitySuite in Maven builds by causing spilling to occur way too frequently.This configuration leak was inadvertently introduced during test cleanup in #9618.