switching to unordered_map

Author: Matthew Topol

cpp/src/arrow/io/hdfs.h

@@ -19,7 +19,7 @@
 #define ARROW_IO_HDFS
 
 #include <cstdint>
-#include <map>
+#include <unordered_map>
 #include <memory>
 #include <string>
 #include <vector>
@@ -64,7 +64,7 @@ struct HdfsConnectionConfig {
   int port;
   std::string user;
   std::string kerb_ticket;
-  std::map<std::string, std::string> extra_conf;
+  std::unordered_map<std::string, std::string> extra_conf;
   HdfsDriver driver;
 };
 

python/pyarrow/includes/libarrow.pxd

@@ -18,7 +18,6 @@
 # distutils: language = c++
 
 from pyarrow.includes.common cimport *
-from libcpp.map cimport map as cppmap
 
 cdef extern from "arrow/util/key_value_metadata.h" namespace "arrow" nogil:
     cdef cppclass CKeyValueMetadata" arrow::KeyValueMetadata":
@@ -651,7 +650,7 @@ cdef extern from "arrow/io/api.h" namespace "arrow::io" nogil:
         int port
         c_string user
         c_string kerb_ticket
-        cppmap[c_string, c_string] extra_conf
+        unordered_map[c_string, c_string] extra_conf
         HdfsDriver driver
 
     cdef cppclass HdfsPathInfo: