Bug#30822: ALTER TABLE COALESCE PARTITION causes segmentation fault

Problem was for LINEAR HASH/KEY. Crashes because of wrong partition id
returned when creating the new altered partitions. (because of wrong
linear hash mask)

Solution: Update the linear hash mask before using it for the new
altered table.


mysql-test/r/partition_hash.result:
  Bug#30822: ALTER TABLE COALESCE PARTITION causes segmentation fault
  
  test result
mysql-test/t/partition_hash.test:
  Bug#30822: ALTER TABLE COALESCE PARTITION causes segmentatition fault
  
  test case
sql/ha_partition.cc:
  Bug#30822: ALTER TABLE COALESCE PARTITION causes segmentation fault
  
  Updating the linear hash mask before using it.
sql/sql_partition.cc:
  Bug#30822: ALTER TABLE COALESCE PARTITION causes segmentation fault
  
  exporting the set_linear_hash_mask function (static -> non static)
sql/sql_partition.h:
  Bug#30822: ALTER TABLE COALESCE PARTITION causes segmentation fault
  
  exporting the set_linear_hash_mask function (static -> non static)

1 files changed, 8 insertions, 0 deletions

diff --git a/sql/ha_partition.cc b/sql/ha_partition.cc
index b53a5e3da97..d1b20896d9a 100644
--- a/sql/ha_partition.cc
+++ b/sql/ha_partition.cc
@@ -1531,6 +1531,14 @@ int ha_partition::copy_partitions(ulonglong *copied, ulonglong *deleted)
   longlong func_value;
   DBUG_ENTER("ha_partition::copy_partitions");
 
+  if (m_part_info->linear_hash_ind)
+  {
+    if (m_part_info->part_type == HASH_PARTITION)
+      set_linear_hash_mask(m_part_info, m_part_info->no_parts);
+    else
+      set_linear_hash_mask(m_part_info, m_part_info->no_subparts);
+  }
+
   while (reorg_part < m_reorged_parts)
   {
     handler *file= m_reorged_file[reorg_part];