From: Tor Didriksen
Date: September 19 2011 2:28pm
Subject: bzr push into mysql-trunk branch (tor.didriksen:3439 to 3440)
List-Archive: http://lists.mysql.com/commits/141013
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 3440 Tor Didriksen	2011-09-19
      Add a UDF using stl.

    modified:
      mysql-test/r/udf.result
      mysql-test/t/udf.test
      sql/udf_example.cc
 3439 Tor Didriksen	2011-09-19
      Convert udf_example from .c to .cc

    renamed:
      sql/udf_example.c => sql/udf_example.cc
    modified:
      sql/CMakeLists.txt
      sql/udf_example.cc
=== modified file 'mysql-test/r/udf.result'
--- a/mysql-test/r/udf.result	2011-07-19 15:11:15 +0000
+++ b/mysql-test/r/udf.result	2011-09-19 14:27:04 +0000
@@ -499,3 +499,26 @@ UNLOCK TABLES;
 # Reaping: CREATE FUNCTION metaphon ...
 DROP FUNCTION metaphon;
 DROP FUNCTION reverse_lookup;
+#
+# WL#5825 Using C++ Standard Library with MySQL code
+#
+CREATE AGGREGATE FUNCTION my_median
+RETURNS INTEGER SONAME "UDF_EXAMPLE_LIB";
+SELECT my_median(1);
+my_median(1)
+1
+CREATE TABLE t1(a INT, b INT);
+SELECT a, my_median(b) from t1 group by a;
+a	my_median(b)
+INSERT INTO t1 values
+(1, 1), (1, 2), (1, 200),
+(2, 1), (2, 200), (2, 200), (2, 1000),
+(3, 1), (3, 1), (3, 100), (3, 100), (3, 42)
+;
+SELECT a, my_median(b) from t1 GROUP BY a;
+a	my_median(b)
+1	2
+2	200
+3	42
+DROP FUNCTION my_median;
+DROP TABLE t1;

=== modified file 'mysql-test/t/udf.test'
--- a/mysql-test/t/udf.test	2011-02-09 10:19:05 +0000
+++ b/mysql-test/t/udf.test	2011-09-19 14:27:04 +0000
@@ -603,3 +603,24 @@ connection default;
 --reap
 DROP FUNCTION metaphon;
 DROP FUNCTION reverse_lookup;
+
+--echo #
+--echo # WL#5825 Using C++ Standard Library with MySQL code
+--echo #
+
+--replace_result $UDF_EXAMPLE_LIB UDF_EXAMPLE_LIB
+eval CREATE AGGREGATE FUNCTION my_median
+RETURNS INTEGER SONAME "$UDF_EXAMPLE_LIB";
+
+SELECT my_median(1);
+CREATE TABLE t1(a INT, b INT);
+SELECT a, my_median(b) from t1 group by a;
+INSERT INTO t1 values
+(1, 1), (1, 2), (1, 200),
+(2, 1), (2, 200), (2, 200), (2, 1000),
+(3, 1), (3, 1), (3, 100), (3, 100), (3, 42)
+;
+SELECT a, my_median(b) from t1 GROUP BY a;
+
+DROP FUNCTION my_median;
+DROP TABLE t1;

=== modified file 'sql/udf_example.cc'
--- a/sql/udf_example.cc	2011-09-19 11:20:45 +0000
+++ b/sql/udf_example.cc	2011-09-19 14:27:04 +0000
@@ -112,6 +112,8 @@
 */
 
 #include <new>
+#include <vector>
+#include <algorithm>
 
 #ifdef STANDARD
 /* STANDARD is defined, don't use any mysql functions */
@@ -1153,4 +1155,79 @@ char * check_const_len(UDF_INIT *initid,
 }
 
 
+C_MODE_START;
+my_bool  my_median_init  (UDF_INIT *initid, UDF_ARGS *args, char *message);
+void     my_median_deinit(UDF_INIT* initid);
+void     my_median_add   (UDF_INIT* initid, UDF_ARGS* args,
+                          char* is_null, char *error);
+void     my_median_clear (UDF_INIT* initid, UDF_ARGS* args,
+                          char* is_null, char *error);
+longlong my_median       (UDF_INIT* initid, UDF_ARGS* args,
+                          char* is_null, char *error);
+C_MODE_END;
+
+struct My_median_data
+{
+  std::vector<longlong> vec;
+};
+
+
+my_bool  my_median_init  (UDF_INIT *initid, UDF_ARGS *args, char *message)
+{
+  My_median_data *data= new (std::nothrow) My_median_data;
+  if (!data)
+  {
+    strmov(message,"Could not allocate memory");
+    return true;
+  }
+  initid->ptr= static_cast<char*>(static_cast<void*>(data));
+  return false;
+}
+
+void my_median_deinit(UDF_INIT* initid)
+{
+  My_median_data *data=
+    static_cast<My_median_data*>(static_cast<void*>(initid->ptr));
+  delete data;
+}
+
+void my_median_add(UDF_INIT* initid, UDF_ARGS* args,
+                   char* is_null __attribute__((unused)),
+                   char* message __attribute__((unused)))
+{
+  My_median_data *data=
+    static_cast<My_median_data*>(static_cast<void*>(initid->ptr));
+  if (args->args[0])
+  {
+    void *arg0= args->args[0];
+    longlong number= *(static_cast<longlong*>(arg0));
+    data->vec.push_back(number);
+  }
+}
+
+void my_median_clear(UDF_INIT* initid, UDF_ARGS* args,
+                     char* is_null __attribute__((unused)),
+                     char* message __attribute__((unused)))
+{
+  My_median_data *data=
+    static_cast<My_median_data*>(static_cast<void*>(initid->ptr));
+  data->vec.clear();
+}
+
+longlong my_median(UDF_INIT* initid, UDF_ARGS* args,
+                   char* is_null,
+                   char* message __attribute__((unused)))
+{
+  My_median_data *data=
+    static_cast<My_median_data*>(static_cast<void*>(initid->ptr));
+  if (data->vec.size() == 0)
+  {
+    *is_null= 1;
+    return 0;
+  }
+  const size_t ix= data->vec.size() / 2;
+  std::nth_element(data->vec.begin(), data->vec.begin() + ix, data->vec.end());
+  return data->vec[ix];
+}
+
 #endif /* HAVE_DLOPEN */

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