BroadcastJoin failed on partitioned parquet table

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Hi, guys:
     I'm using Spark1.6.2.
     There are two tables and the small one is a partitioned parquet table;
     The total size of the small table is 1000M but each partition only 1M;
     When I set spark.sql.autoBroadcastJoinThreshold to 50m ​and join the two 
tables with single partition, I get the SortMergeJoin physical plan.
     I have made some try and it has something to do with the partition pruning:
     1. check the physical plan, and all of the partitions of the small table 
are added in.
      It seems like https://issues.apache.org/jira/browse/SPARK-16980


     2. set spark.sql.hive.convertMetastoreParquet=false
    ​The pruning is success, but still get SortMergeJoin because the code 
HiveMetastoreCatalog.scala
      @transient override lazy val statistics: Statistics = Statistics(
  sizeInBytes = {
    val totalSize = hiveQlTable.getParameters.get(StatsSetupConst.TOTAL_SIZE)
    val rawDataSize = 
hiveQlTable.getParameters.get(StatsSetupConst.RAW_DATA_SIZE)    The total size 
of the table not the single partition.


    How can I fix this without patches? Or Is there a patch for SPARK1.6 about 
SPARK-16980.
  


best regards！
Jerry