WL#3352, Introducing Column list partitioning, makes it possible to partition on most data types, makes it possible to prune on multi-field partitioning

1 files changed, 34 insertions, 3 deletions

diff --git a/sql/partition_element.h b/sql/partition_element.h
index 905bc38165b..d749681fe9b 100644
--- a/sql/partition_element.h
+++ b/sql/partition_element.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2006 MySQL AB
+/* Copyright (C) 2006-2009 MySQL AB
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -36,6 +36,35 @@ enum partition_state {
 };
 
 /*
+  This struct is used to keep track of column expressions as part
+  of the COLUMNS concept in conjunction with RANGE and LIST partitioning.
+  The value can be either of MINVALUE, MAXVALUE and an expression that
+  must be constant and evaluate to the same type as the column it
+  represents.
+
+  The data in this fixed in two steps. The parser will only fill in whether
+  it is a max_value or provide an expression. Filling in
+  column_value, part_info, partition_id, null_value is done by the
+  function fix_column_value_function. However the item tree needs
+  fixed also before writing it into the frm file (in add_column_list_values).
+  To distinguish between those two variants, fixed= 1 after the
+  fixing in add_column_list_values and fixed= 2 otherwise. This is
+  since the fixing in add_column_list_values isn't a complete fixing.
+*/
+
+typedef struct p_column_list_val
+{
+  void* column_value;
+  Item* item_expression;
+  partition_info *part_info;
+  uint partition_id;
+  bool max_value;
+  bool null_value;
+  char fixed;
+} part_column_list_val;
+
+
+/*
   This struct is used to contain the value of an element
   in the VALUES IN struct. It needs to keep knowledge of
   whether it is a signed/unsigned value and whether it is
@@ -47,6 +76,7 @@ typedef struct p_elem_val
   longlong value;
   bool null_value;
   bool unsigned_flag;
+  part_column_list_val *col_val_array;
 } part_elem_value;
 
 struct st_ddl_log_memory_entry;
@@ -68,8 +98,9 @@ public:
   enum partition_state part_state;
   uint16 nodegroup_id;
   bool has_null_value;
-  bool signed_flag;/* Indicate whether this partition uses signed constants */
-  bool max_value;  /* Indicate whether this partition uses MAXVALUE */
+  /* signed_flag and max_value only relevant for subpartitions */
+  bool signed_flag;
+  bool max_value;
 
   partition_element()
   : part_max_rows(0), part_min_rows(0), range_value(0),