Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22614#discussion_r223459567
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
    @@ -544,6 +544,15 @@ object SQLConf {
           .booleanConf
           .createWithDefault(true)
     
    +  val HIVE_METASTORE_PARTITION_PRUNING_FALLBACK_ENABLED =
    +    buildConf("spark.sql.hive.metastorePartitionPruning.fallback.enabled")
    +      .doc("When true, enable fallback to fetch all partitions if Hive 
metastore partition " +
    +           "push down fails. This is applicable only if partition pruning 
is enabled (see " +
    +           s" ${HIVE_METASTORE_PARTITION_PRUNING.key}). Enabling this may 
degrade performance " +
    +           "if there are a large number of partitions." )
    --- End diff --
    
    "if there is"


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