addresses #1705

isolate blob unpacking into a function

git-svn-id: file:///svn/mysql/tokudb-engine/src@11421 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -778,6 +778,8 @@ ha_tokudb::ha_tokudb(handlerton * hton, TABLE_SHARE * table_arg):handler(hton, t
     num_added_rows_in_stmt = 0;
     num_deleted_rows_in_stmt = 0;
     num_updated_rows_in_stmt = 0;
+    blob_buff = NULL;
+    num_blob_bytes = 0;
 }
 
 //
@@ -1498,6 +1500,28 @@ cleanup:
     return r;
 }
 
+
+void ha_tokudb::unpack_blobs(
+    uchar* record,
+    const uchar* from_tokudb_blob,
+    u_int32_t num_blob_bytes
+    )
+{
+    //
+    // now read blobs
+    //
+    const uchar* ptr = from_tokudb_blob;
+    for (uint i = 0; i < share->num_blobs; i++) {
+        Field* field = table->field[share->blob_fields[i]];
+        ptr = field->unpack(
+            record + field_offset(field, table),
+            ptr
+            );
+    }
+
+}
+    
+
 //
 // take the row passed in as a DBT*, and convert it into a row in MySQL format in record
 // Parameters:
@@ -1584,14 +1608,12 @@ void ha_tokudb::unpack_row(
                 last_offset = data_end_offset;
             }
         }
-        for (uint i = 0; i < share->num_blobs; i++) {
-            Field* field = table->field[share->blob_fields[i]];
-            var_field_data_ptr = field->unpack(
-                record + field_offset(field, table),
-                var_field_data_ptr
+        unpack_blobs(
+            record,
+            var_field_data_ptr,
+            row->size - (u_int32_t)(var_field_data_ptr - (const uchar *)row->data)
             );
     }
-    }
     //
     // in this case, we unpack only what is specified 
     // in fixed_cols_for_query and var_cols_for_query
@@ -1656,6 +1678,7 @@ void ha_tokudb::unpack_row(
                 );
         }
 
+        if (read_blobs) {
             //
             // now the blobs
             //
@@ -1680,11 +1703,11 @@ void ha_tokudb::unpack_row(
                 }
                 var_field_data_ptr += data_end_offset;
             }
-        for (uint i = 0; i < share->num_blobs; i++) {
-            Field* field = table->field[share->blob_fields[i]];
-            var_field_data_ptr = field->unpack(
-                record + field_offset(field, table),
-                var_field_data_ptr
+
+            unpack_blobs(
+                record,
+                var_field_data_ptr,
+                row->size - (u_int32_t)(var_field_data_ptr - (const uchar *)row->data)
                 );
         }
     }

storage/tokudb/ha_tokudb.h

@@ -142,6 +142,15 @@ private:
     //
     uchar *primary_key_buff;
 
+    //
+    // when unpacking blobs, we need to store it in a temporary
+    // buffer that will persist because MySQL just gets a pointer to the 
+    // blob data, a pointer we need to ensure is valid until the next
+    // query
+    //
+    uchar* blob_buff;
+    u_int32_t num_blob_bytes;
+
     bool unpack_entire_row;
 
     //
@@ -394,6 +403,11 @@ public:
     void read_key_only(uchar * buf, uint keynr, DBT const *row, DBT const *found_key);
     void read_primary_key(uchar * buf, uint keynr, DBT const *row, DBT const *found_key);
     int read_row(uchar * buf, uint keynr, DBT const *row, DBT const *found_key);
+    void ha_tokudb::unpack_blobs(
+        uchar* record,
+        const uchar* from_tokudb_blob,
+        u_int32_t num_blob_bytes
+        );
     void unpack_row(
         uchar* record, 
         DBT const *row,