MariaRocks port: Return correct value of HA_PRIMARY_KEY_IN_READ_INDEX flag

This cset just re-uses the approach from facebook/mysql-5.6 (Perhaps we
will have something different for MariaDB in the end).

For now this is:
Port this fix
  dd7eeae69503cb8ab6ddc8fd9e2fef451cc31a32
  Issue#250: MyRocks/Innodb different output from query with order by on table with index and decimal type
  Summary:
  Make open_binary_frm() set TABLE_SHARE::primary_key before it computes

Also add the patch for
  https://github.com/facebook/mysql-5.6/issues/376

sql/ha_partition.cc

@@ -421,6 +421,22 @@ ha_partition::~ha_partition()
 }
 
 
+bool ha_partition::init_with_fields()
+{
+  /* Pass the call to each partition */
+  for (uint i= 0; i < m_tot_parts; i++)
+  {
+    if (m_file[i]->init_with_fields())
+      return true;
+  }
+  /* Re-read table flags in case init_with_fields caused it to change */
+  cached_table_flags= (m_file[0]->ha_table_flags() &
+                       ~(PARTITION_DISABLED_TABLE_FLAGS)) |
+                      PARTITION_ENABLED_TABLE_FLAGS;
+  return false;
+}
+
+
 /*
   Initialize partition handler object
 

sql/ha_partition.h

@@ -307,6 +307,8 @@ public:
                  ha_partition *clone_arg,
                  MEM_ROOT *clone_mem_root_arg);
    ~ha_partition();
+
+   bool init_with_fields();
   /*
     A partition handler has no characteristics in itself. It only inherits
     those from the underlying handlers. Here we set-up those constants to

sql/handler.h

@@ -2757,6 +2757,8 @@ public:
   {
     cached_table_flags= table_flags();
   }
+
+  virtual bool init_with_fields() { return false; }
   /* ha_ methods: pubilc wrappers for private virtual API */
   
   int ha_open(TABLE *table, const char *name, int mode, uint test_if_locked);

sql/table.cc

@@ -2061,18 +2061,6 @@ int TABLE_SHARE::init_from_binary_frm_image(THD *thd, bool write,
         if (key == primary_key)
         {
           field->flags|= PRI_KEY_FLAG;
-          /*
-            If this field is part of the primary key and all keys contains
-            the primary key, then we can use any key to find this column
-          */
-          if (ha_option & HA_PRIMARY_KEY_IN_READ_INDEX)
-          {
-            if (field->key_length() == key_part->length &&
-                !(field->flags & BLOB_FLAG))
-              field->part_of_key= share->keys_in_use;
-            if (field->part_of_sortkey.is_set(key))
-              field->part_of_sortkey= share->keys_in_use;
-          }
         }
         if (field->key_length() != key_part->length)
         {
@@ -2132,6 +2120,38 @@ int TABLE_SHARE::init_from_binary_frm_image(THD *thd, bool write,
           (ha_option & HA_ANY_INDEX_MAY_BE_UNIQUE))
         set_if_bigger(share->max_unique_length,keyinfo->key_length);
     }
+
+    /*
+      The next call is here for MyRocks/MariaRocks:  Now, we have filled in
+      field and key definitions, give the storage engine a chance to adjust
+      its properties.
+
+      MyRocks may (and typically does) adjust HA_PRIMARY_KEY_IN_READ_INDEX
+      flag in this call.
+    */
+    if (handler_file->init_with_fields())
+      goto err;
+
+    if (primary_key < MAX_KEY && (handler_file->ha_table_flags() &
+                                  HA_PRIMARY_KEY_IN_READ_INDEX))
+    {
+      keyinfo= &share->key_info[primary_key];
+      key_part= keyinfo->key_part;
+      for (i=0 ; i < keyinfo->user_defined_key_parts ; key_part++,i++)
+      {
+        Field *field= key_part->field;
+        /*
+          If this field is part of the primary key and all keys contains
+          the primary key, then we can use any key to find this column
+        */
+        if (field->key_length() == key_part->length &&
+            !(field->flags & BLOB_FLAG))
+          field->part_of_key= share->keys_in_use;
+        if (field->part_of_sortkey.is_set(primary_key))
+          field->part_of_sortkey= share->keys_in_use;
+      }
+    }
+
     if (primary_key < MAX_KEY &&
 	(share->keys_in_use.is_set(primary_key)))
     {

storage/rocksdb/ha_rocksdb.cc

@@ -4075,7 +4075,7 @@ bool ha_rocksdb::same_table(const ha_rocksdb& other) const
   return m_tbl_def->base_tablename() == other.m_tbl_def->base_tablename();
 }
 
-#ifdef MARIAROCKS_NOT_YET
+
 bool ha_rocksdb::init_with_fields()
 {
   uint pk= table_share->primary_key;
@@ -4090,7 +4090,7 @@ bool ha_rocksdb::init_with_fields()
   cached_table_flags= table_flags();
   return false; /* Ok */
 }
-#endif
+
 
 /**
   Convert record from table->record[0] form into a form that can be written
@@ -4884,6 +4884,7 @@ int ha_rocksdb::open(const char *name, int mode, uint test_if_locked)
     DBUG_RETURN(err);
   }
 
+  init_with_fields();
   setup_field_converters();
 
   info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);

storage/rocksdb/ha_rocksdb.h

@@ -592,9 +592,9 @@ public:
            HA_PARTIAL_COLUMN_READ |
            HA_TABLE_SCAN_ON_INDEX;
   }
-#ifdef MARIAROCKS_NOT_YET
+//#ifdef MARIAROCKS_NOT_YET
   bool init_with_fields() override;
-#endif
+//#endif
   /** @brief
     This is a bitmap of flags that indicates how the storage engine
     implements indexes. The current index flags are documented in