Fix for bug#15447 Partitions: NULL is treated as zero

  NULL value handling


mysql-test/r/ndb_partition_error.result:
  Fix for bug#15447 Partitions: NULL is treated as zero
    test case
mysql-test/r/partition.result:
  Fix for bug#15447 Partitions: NULL is treated as zero
    test case
mysql-test/t/ndb_partition_error.test:
  Fix for bug#15447 Partitions: NULL is treated as zero
    test case
mysql-test/t/partition.test:
  Fix for bug#15447 Partitions: NULL is treated as zero
    test case
sql/partition_element.h:
  Fix for bug#15447 Partitions: NULL is treated as zero
    added null value flag to partition_element object
sql/partition_info.h:
  Fix for bug#15447 Partitions: NULL is treated as zero
    added null value flag to partition_info object
    added has_null partition id variable

7 files changed, 93 insertions, 12 deletions

diff --git a/sql/ha_ndbcluster.cc b/sql/ha_ndbcluster.cc
index ff8a1221052..7f1eb343139 100644
--- a/sql/ha_ndbcluster.cc
+++ b/sql/ha_ndbcluster.cc
@@ -6012,6 +6012,7 @@ void ha_ndbcluster::print_error(int error, myf errflag)
   {
     char buf[100];
     my_error(ER_NO_PARTITION_FOR_GIVEN_VALUE, MYF(0),
+             m_part_info->part_expr->null_value ? "NULL" :
              llstr(m_part_info->part_expr->val_int(), buf));
   }
   else
diff --git a/sql/ha_partition.cc b/sql/ha_partition.cc
index e7a324481db..927b5a4a065 100644
--- a/sql/ha_partition.cc
+++ b/sql/ha_partition.cc
@@ -5092,6 +5092,7 @@ void ha_partition::print_error(int error, myf errflag)
   {
     char buf[100];
     my_error(ER_NO_PARTITION_FOR_GIVEN_VALUE, MYF(0),
+             m_part_info->part_expr->null_value ? "NULL" :
              llstr(m_part_info->part_expr->val_int(), buf));
   }
   else
diff --git a/sql/partition_element.h b/sql/partition_element.h
index 8a11c332897..d20715d2408 100644
--- a/sql/partition_element.h
+++ b/sql/partition_element.h
@@ -51,13 +51,14 @@ public:
   handlerton *engine_type;
   enum partition_state part_state;
   uint16 nodegroup_id;
+  bool has_null_value;
 
   partition_element()
   : part_max_rows(0), part_min_rows(0), partition_name(NULL),
     tablespace_name(NULL), range_value(0), part_comment(NULL),
     data_file_name(NULL), index_file_name(NULL),
     engine_type(NULL),part_state(PART_NORMAL),
-    nodegroup_id(UNDEF_NODEGROUP)
+    nodegroup_id(UNDEF_NODEGROUP), has_null_value(FALSE)
   {
     subpartitions.empty();
     list_val_list.empty();
diff --git a/sql/partition_info.h b/sql/partition_info.h
index c8cb4ae407a..4a00f5c889f 100644
--- a/sql/partition_info.h
+++ b/sql/partition_info.h
@@ -181,6 +181,9 @@ public:
   bool linear_hash_ind;
   bool fixed;
   bool from_openfrm;
+  bool has_null_value;
+  uint has_null_part_id;
+
 
   partition_info()
   : get_partition_id(NULL), get_part_partition_id(NULL),
@@ -211,7 +214,9 @@ public:
     list_of_part_fields(FALSE), list_of_subpart_fields(FALSE),
     linear_hash_ind(FALSE),
     fixed(FALSE),
-    from_openfrm(FALSE)
+    from_openfrm(FALSE),
+    has_null_value(FALSE),
+    has_null_part_id(0)
   {
     all_fields_in_PF.clear_all();
     all_fields_in_PPF.clear_all();
diff --git a/sql/sql_partition.cc b/sql/sql_partition.cc
index c98f8f915b9..257c1988cbd 100644
--- a/sql/sql_partition.cc
+++ b/sql/sql_partition.cc
@@ -531,6 +531,7 @@ static bool check_list_constants(partition_info *part_info)
   bool result= TRUE;
   longlong curr_value, prev_value;
   partition_element* part_def;
+  bool found_null= FALSE;
   List_iterator<partition_element> list_func_it(part_info->partitions);
   DBUG_ENTER("check_list_constants");
 
@@ -556,6 +557,17 @@ static bool check_list_constants(partition_info *part_info)
   do
   {
     part_def= list_func_it++;
+    if (part_def->has_null_value)
+    {
+      if (found_null)
+      {
+        my_error(ER_MULTIPLE_DEF_CONST_IN_LIST_PART_ERROR, MYF(0));
+        goto end;
+      }
+      part_info->has_null_value= TRUE;
+      part_info->has_null_part_id= i;
+      found_null= TRUE;
+    }
     List_iterator<longlong> list_val_it1(part_def->list_val_list);
     while (list_val_it1++)
       no_list_values++;
@@ -2041,6 +2053,16 @@ static int add_partition_values(File fptr, partition_info *part_info,
     err+= add_string(fptr, "VALUES IN ");
     uint no_items= p_elem->list_val_list.elements;
     err+= add_begin_parenthesis(fptr);
+    if (p_elem->has_null_value)
+    {
+      err+= add_string(fptr, "NULL");
+      if (no_items == 0)
+      {
+        err+= add_end_parenthesis(fptr);
+        goto end;
+      }
+      err+= add_comma(fptr);
+    }
     i= 0;
     do
     {
@@ -2051,6 +2073,7 @@ static int add_partition_values(File fptr, partition_info *part_info,
     } while (++i < no_items);
     err+= add_end_parenthesis(fptr);
   }
+end:
   return err + add_space(fptr);
 }
 
@@ -2631,6 +2654,15 @@ int get_partition_id_list(partition_info *part_info,
   longlong part_func_value= part_val_int(part_info->part_expr);
   DBUG_ENTER("get_partition_id_list");
 
+  if (part_info->part_expr->null_value)
+  {
+    if (part_info->has_null_value)
+    {
+      *part_id= part_info->has_null_part_id;
+      DBUG_RETURN(0);
+    }
+    goto notfound;
+  }
   *func_value= part_func_value;
   while (max_list_index >= min_list_index)
   {
@@ -2741,6 +2773,11 @@ int get_partition_id_range(partition_info *part_info,
   longlong part_func_value= part_val_int(part_info->part_expr);
   DBUG_ENTER("get_partition_id_int_range");
 
+  if (part_info->part_expr->null_value)
+  {
+    *part_id= 0;
+    DBUG_RETURN(0);
+  }
   while (max_part_id > min_part_id)
   {
     loc_part_id= (max_part_id + min_part_id + 1) >> 1;
@@ -2814,6 +2851,10 @@ uint32 get_partition_id_range_for_endpoint(partition_info *part_info,
   uint min_part_id= 0, max_part_id= max_partition, loc_part_id;
   /* Get the partitioning function value for the endpoint */
   longlong part_func_value= part_val_int(part_info->part_expr);
+
+  if (part_info->part_expr->null_value)
+    DBUG_RETURN(0);
+
   while (max_part_id > min_part_id)
   {
     loc_part_id= (max_part_id + min_part_id + 1) >> 1;
diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index 13f880ef228..51c92977a27 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -3832,6 +3832,12 @@ static int get_schema_partitions_record(THD *thd, struct st_table_list *tables,
         uint no_items= part_elem->list_val_list.elements;
         tmp_str.length(0);
         tmp_res.length(0);
+        if (part_elem->has_null_value)
+        {
+          tmp_str.append("NULL");
+          if (no_items > 0)
+            tmp_str.append(",");
+        }
         while ((list_value= list_val_it++))
         {
           tmp_res.set(*list_value, cs);
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index 6c8b52d243c..235e78c6657 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -42,6 +42,12 @@
 #include <myisam.h>
 #include <myisammrg.h>
 
+typedef struct p_elem_val
+{ 
+  longlong value;
+  bool null_value;
+} part_elem_value;
+
 int yylex(void *yylval, void *yythd);
 
 const LEX_STRING null_lex_str={0,0};
@@ -105,6 +111,7 @@ inline Item *is_truth_value(Item *A, bool v1, bool v2)
   sp_name *spname;
   struct st_lex *lex;
   sp_head *sphead;
+  struct p_elem_val *p_elem_value;
 }
 
 %{
@@ -752,7 +759,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %type <ulonglong_number>
 	ulonglong_num size_number
 
-%type <longlong_number>
+%type <p_elem_value>
         part_bit_expr
 
 %type <lock_type>
@@ -3781,7 +3788,7 @@ part_func_max:
 part_range_func:
         '(' part_bit_expr ')' 
         {
-          Lex->part_info->curr_part_elem->range_value= $2;
+          Lex->part_info->curr_part_elem->range_value= $2->value;
         }
         ;
 
@@ -3793,12 +3800,12 @@ part_list_func:
 part_list_item:
         part_bit_expr
         {
-          longlong *value_ptr;
-          if (!(value_ptr= (longlong*)sql_alloc(sizeof(longlong))) ||
-              ((*value_ptr= $1, FALSE) ||
-     Lex->part_info->curr_part_elem->list_val_list.push_back(value_ptr)))
+          part_elem_value *value_ptr= $1;
+          if (!value_ptr->null_value &&
+             Lex->part_info->curr_part_elem->
+              list_val_list.push_back((longlong*) &value_ptr->value))
           {
-            mem_alloc_error(sizeof(longlong));
+            mem_alloc_error(sizeof(part_elem_value));
             YYABORT;
           }
         }
@@ -3818,6 +3825,15 @@ part_bit_expr:
 
           context->table_list= 0;
           thd->where= "partition function";
+
+          part_elem_value *value_ptr= 
+            (part_elem_value*)sql_alloc(sizeof(part_elem_value));
+          if (!value_ptr)
+          {
+            mem_alloc_error(sizeof(part_elem_value));
+            YYABORT;
+          }
+
           if (part_expr->fix_fields(YYTHD, (Item**)0) ||
               ((context->table_list= save_list), FALSE) ||
               (!part_expr->const_item()) ||
@@ -3827,13 +3843,23 @@ part_bit_expr:
             YYABORT;
           }
           thd->where= save_where;
-          if (part_expr->result_type() != INT_RESULT)
+          value_ptr->value= part_expr->val_int();
+          if ((value_ptr->null_value= part_expr->null_value))
+          {
+            if (Lex->part_info->curr_part_elem->has_null_value)
+            {
+              my_error(ER_MULTIPLE_DEF_CONST_IN_LIST_PART_ERROR, MYF(0));
+              YYABORT;
+            }
+            Lex->part_info->curr_part_elem->has_null_value= TRUE;
+          }
+          else if (part_expr->result_type() != INT_RESULT &&
+                   !part_expr->null_value)
           {
             yyerror(ER(ER_INCONSISTENT_TYPE_OF_FUNCTIONS_ERROR));
             YYABORT;
           }
-          item_value= part_expr->val_int();
-          $$= item_value; 
+          $$= value_ptr; 
         }
         ;