MDEV-6473 - main.statistics fails on PPC64

mysql.column_stats wasn't stored/restored properly on big-endian
with histogram_type=DOUBLE_PREC_HB.

Store histogram values using int2store()/uint2korr().

Note that this patch invalidates previously calculated histogram
values on big-endian.

1 files changed, 3 insertions, 3 deletions

diff --git a/sql/sql_statistics.h b/sql/sql_statistics.h
index 331e3559203..c399951b828 100644
--- a/sql/sql_statistics.h
+++ b/sql/sql_statistics.h
@@ -147,7 +147,7 @@ private:
     case SINGLE_PREC_HB:
       return (uint) (((uint8 *) values)[i]);
     case DOUBLE_PREC_HB:
-      return (uint) (((uint16 *) values)[i]);
+      return (uint) uint2korr(values + i * 2);
     }
     return 0;
   }
@@ -214,7 +214,7 @@ public:
       ((uint8 *) values)[i]= (uint8) (val * prec_factor());
       return;
     case DOUBLE_PREC_HB:
-      ((uint16 *) values)[i]= (uint16) (val * prec_factor());
+      int2store(values + i * 2, val * prec_factor());
       return;
     }
   }
@@ -226,7 +226,7 @@ public:
       ((uint8 *) values)[i]= ((uint8 *) values)[i-1];
       return;
     case DOUBLE_PREC_HB:
-      ((uint16 *) values)[i]= ((uint16 *) values)[i-1];
+      int2store(values + i * 2, uint2korr(values + i * 2 - 2));
       return;
     }
   }