MDEV-16050 cte + geometry functions lead to crash.

Structures based on Gcalc_dyn_list need to be treated
properly when copied in Item::get_copy().

mysql-test/r/gis-precise.result

@@ -505,6 +505,9 @@ GEOMETRYFROMTEXT('POINT(4599 60359)'),
     ) as relate_res;
 relate_res
 0
+with cte1 as(   select (st_symdifference(point(1,1),point(1,1))) as a1 ), cte2 as(select 1 as a2)  select 1 from cte1 where cte1.a1 < '1';
+1
+1
 DROP TABLE IF EXISTS p1;
 CREATE PROCEDURE p1(dist DOUBLE, geom TEXT)
 BEGIN

mysql-test/t/gis-precise.test

@@ -381,5 +381,9 @@ SELECT ST_RELATE(
     'F*FFFF**F'
     ) as relate_res;
 
+# MDEV- 16050 cte + geometry functions lead to crash.
+
+with cte1 as(   select (st_symdifference(point(1,1),point(1,1))) as a1 ), cte2 as(select 1 as a2)  select 1 from cte1 where cte1.a1 < '1';
+
 --source include/gis_debug.inc
 

sql/gcalc_slicescan.cc

@@ -177,6 +177,17 @@ Gcalc_dyn_list::Gcalc_dyn_list(size_t blk_size, size_t sizeof_item):
 {}
 
 
+Gcalc_dyn_list::Gcalc_dyn_list(const Gcalc_dyn_list &dl)
+{
+  m_blk_size= dl.m_blk_size;
+  m_sizeof_item= dl.m_sizeof_item;
+  m_points_per_blk= dl.m_points_per_blk;
+  m_blk_hook= &m_first_blk;
+  m_free= NULL;
+  m_keep= NULL;
+}
+
+
 void Gcalc_dyn_list::format_blk(void* block)
 {
   Item *pi_end, *cur_pi, *first_pi;

sql/gcalc_slicescan.h

@@ -63,6 +63,7 @@ class Gcalc_dyn_list
   };
 
   Gcalc_dyn_list(size_t blk_size, size_t sizeof_item);
+  Gcalc_dyn_list(const Gcalc_dyn_list &dl);
   ~Gcalc_dyn_list();
   Item *new_item()
   {
@@ -229,6 +230,12 @@ class Gcalc_heap : public Gcalc_dyn_list
     Gcalc_dyn_list(blk_size, sizeof(Info)),
     m_hook(&m_first), m_n_points(0)
   {}
+
+  Gcalc_heap(const Gcalc_heap &gh) :
+    Gcalc_dyn_list(gh),
+    m_hook(&m_first), m_n_points(0)
+  {}
+
   void set_extent(double xmin, double xmax, double ymin, double ymax);
   Info *new_point_info(double x, double y, gcalc_shape_info shape);
   void free_point_info(Info *i, Gcalc_dyn_list::Item **i_hook);

sql/gcalc_tools.cc

@@ -663,6 +663,17 @@ Gcalc_operation_reducer::Gcalc_operation_reducer(size_t blk_size) :
 {}
 
 
+Gcalc_operation_reducer::Gcalc_operation_reducer(
+                           const Gcalc_operation_reducer &gor) :
+  Gcalc_dyn_list(gor),
+#ifndef GCALC_DBUG_OFF
+  n_res_points(0),
+#endif /*GCALC_DBUG_OFF*/
+  m_res_hook((Gcalc_dyn_list::Item **)&m_result),
+  m_first_active_thread(NULL)
+{}
+
+
 void Gcalc_operation_reducer::init(Gcalc_function *fn, modes mode)
 {
   m_fn= fn;

sql/gcalc_tools.h

@@ -224,6 +224,7 @@ class Gcalc_operation_reducer : public Gcalc_dyn_list
   };
 
   Gcalc_operation_reducer(size_t blk_size=8192);
+  Gcalc_operation_reducer(const Gcalc_operation_reducer &gor);
   void init(Gcalc_function *fn, modes mode= default_mode);
   Gcalc_operation_reducer(Gcalc_function *fn, modes mode= default_mode,
 		       size_t blk_size=8192);