Wenchen Fan created SPARK-5278:
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             Summary: ambiguous reference to fields in Spark SQL is incompleted
                 Key: SPARK-5278
                 URL: https://issues.apache.org/jira/browse/SPARK-5278
             Project: Spark
          Issue Type: Bug
          Components: SQL
            Reporter: Wenchen Fan


for json string like
    {"a":[
      {
         "b": 1,
          "B": 2
       }
    }
The SQL `SELECT a.b from t` will report error for ambiguous reference to fields.
But for json string like
    {"a":[
      {
        "b": 1,
        "B": 2
      }]
    }
The SQL `SELECT a[0].b from t` will pass and pick the first `b`



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