Yin Huai created SPARK-15532:
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             Summary: Add SQLConf.ALLOW_MULTIPLE_CONTEXTS back and make the 
error message configurable 
                 Key: SPARK-15532
                 URL: https://issues.apache.org/jira/browse/SPARK-15532
             Project: Spark
          Issue Type: Bug
            Reporter: Yin Huai


https://github.com/apache/spark/commit/f2ee0ed4b7ecb2855cc4928a9613a07d45446f4e#diff-131c27c6a1f59770d738b11f2a4755ecL87
 removed SQLConf.ALLOW_MULTIPLE_CONTEXTS. The check associated with this flag 
is useful when a deployment of Spark does not allow users to manually create 
SQLContext. So, let's add this flag and its associated check back.



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