A Hive Part that can read values from the metastore, rather than reading values from files.
optional constraits on the partition data to narrow which partitions are read
sets which fields are required by the caller.
optional predicate which will filter rows at the read level
Locates files for a given table.
Locates files for a given table. Connects to the hive metastore to get the partitions list (or if no partitions then just root) and scans those directories. Delegates the directory scan itself to a HiveFileScanner
A Hive Part that can read values from the metastore, rather than reading values from files. This can be used only when the requested fields are all partition partitionKeys.