A fix and a test case for Bug#29306 "Truncated data in MS Access with decimal (3,1) columns in a

VIEW".

mysql_list_fields() C API function would incorrectly set MYSQL_FIELD::decimals
member for some view columns.

The problem was in an incomplete implementation of 
Item_ident_for_show::make_field(), which is responsible for view
columns metadata.


sql/item.cc:
  A fix for Bug#29306 -- properly initialize decimals in 
  Item_ident_for_show::make_field
tests/mysql_client_test.c:
  Add a test case forBug#29306. Fix warnings.

sql/item.cc

@@ -1621,7 +1621,7 @@ void Item_ident_for_show::make_field(Send_field *tmp_field)
   tmp_field->type=field->type();
   tmp_field->flags= field->table->maybe_null ? 
     (field->flags & ~NOT_NULL_FLAG) : field->flags;
-  tmp_field->decimals= 0;
+  tmp_field->decimals= field->decimals();
 }
 
 /**********************************************/

tests/mysql_client_test.c

@@ -15570,7 +15570,7 @@ static void test_bug27876()
   int rc;
   MYSQL_RES *result;
 
-  char utf8_func[] =
+  unsigned char utf8_func[] =
   {
     0xd1, 0x84, 0xd1, 0x83, 0xd0, 0xbd, 0xd0, 0xba,
     0xd1, 0x86, 0xd0, 0xb8, 0xd0, 0xb9, 0xd0, 0xba,
@@ -15578,7 +15578,7 @@ static void test_bug27876()
     0x00
   };
 
-  char utf8_param[] =
+  unsigned char utf8_param[] =
   {
     0xd0, 0xbf, 0xd0, 0xb0, 0xd1, 0x80, 0xd0, 0xb0,
     0xd0, 0xbc, 0xd0, 0xb5, 0xd1, 0x82, 0xd1, 0x8a,
@@ -15735,6 +15735,55 @@ static void test_bug27592()
 }
 
 
+/**
+  Bug#29306 Truncated data in MS Access with decimal (3,1) columns in a VIEW
+*/
+
+static void test_bug29306()
+{
+  MYSQL_FIELD *field;
+  int rc;
+  MYSQL_RES *res;
+
+  DBUG_ENTER("test_bug29306");
+  myheader("test_bug29306");
+
+  rc= mysql_query(mysql, "DROP TABLE IF EXISTS tab17557");
+  myquery(rc);
+  rc= mysql_query(mysql, "DROP VIEW IF EXISTS view17557");
+  myquery(rc);
+  rc= mysql_query(mysql, "CREATE TABLE tab17557 (dd decimal (3,1))");
+  myquery(rc);
+  rc= mysql_query(mysql, "CREATE VIEW view17557 as SELECT dd FROM tab17557");
+  myquery(rc);
+  rc= mysql_query(mysql, "INSERT INTO tab17557 VALUES (7.6)");
+  myquery(rc);
+
+  /* Checking the view */
+  res= mysql_list_fields(mysql, "view17557", NULL);
+  while ((field= mysql_fetch_field(res)))
+  {
+    if (! opt_silent)
+    {
+      printf("field name %s\n", field->name);
+      printf("field table %s\n", field->table);
+      printf("field decimals %d\n", field->decimals);
+      if (field->decimals < 1)
+        printf("Error! No decimals! \n");
+      printf("\n\n");
+    }
+    DIE_UNLESS(field->decimals == 1);
+  }
+  mysql_free_result(res);
+
+  rc= mysql_query(mysql, "DROP TABLE tab17557");
+  myquery(rc);
+  rc= mysql_query(mysql, "DROP VIEW view17557");
+  myquery(rc);
+
+  DBUG_VOID_RETURN;
+}
+
 /*
   Read and parse arguments and MySQL options from my.cnf
 */
@@ -16019,6 +16068,7 @@ static struct my_tests_st my_tests[]= {
   { "test_bug28505", test_bug28505 },
   { "test_bug28934", test_bug28934 },
   { "test_bug27592", test_bug27592 },
+  { "test_bug29306", test_bug29306 },
   { 0, 0 }
 };