spark git commit: [SPARK-18464][SQL] support old table which doesn't store schema in metastore

Repository: spark Updated Branches: refs/heads/branch-2.1 6a3cbbc03 -> 014fceee0 [SPARK-18464][SQL] support old table which doesn't store schema in metastore ## What changes were proposed in this pull request? Before Spark 2.1, users can create an external data source table without schema,

spark git commit: [SPARK-18464][SQL] support old table which doesn't store schema in metastore

Repository: spark Updated Branches: refs/heads/master 170eeb345 -> 07b3f045c [SPARK-18464][SQL] support old table which doesn't store schema in metastore ## What changes were proposed in this pull request? Before Spark 2.1, users can create an external data source table without schema, and