1 files changed, 84 insertions, 0 deletions
diff --git a/sql/derived_handler.cc b/sql/derived_handler.cc
new file mode 100644
index 00000000000..561c18a5657
--- /dev/null
+++ b/sql/derived_handler.cc
@@ -0,0 +1,84 @@
+#include "mariadb.h"
+#include "sql_priv.h"
+#include "sql_select.h"
+#include "derived_handler.h"
+
+void derived_handler::set_derived(TABLE_LIST *tbl)
+{
+  derived= tbl;
+  table= tbl->table;
+  unit= tbl->derived;
+  select= unit->first_select();
+  tmp_table_param= select->next_select() ?
+                   ((select_unit *)(unit->result))->get_tmp_table_param() :
+                   &select->join->tmp_table_param;
+}
+
+Pushdown_derived::Pushdown_derived(TABLE_LIST *tbl, derived_handler *h)
+ : derived(tbl), handler(h)
+{ 
+  is_analyze= handler->thd->lex->analyze_stmt;
+}
+
+Pushdown_derived::~Pushdown_derived()
+{
+  delete handler;
+}
+
+int Pushdown_derived::execute()
+{
+  int err;
+  THD *thd= handler->thd;
+  TABLE *table= handler->table;
+  TMP_TABLE_PARAM *tmp_table_param= handler->tmp_table_param;
+
+  DBUG_ENTER("Pushdown_query::execute");
+
+  if ((err= handler->init_scan()))
+    goto error;
+
+  if (is_analyze)
+  {
+    handler->end_scan();
+    DBUG_RETURN(0);
+  }
+  
+  while (!(err= handler->next_row()))
+  {
+    if (unlikely(thd->check_killed()))
+    {
+      handler->end_scan();
+      DBUG_RETURN(-1);
+    }
+  
+    if ((err= table->file->ha_write_tmp_row(table->record[0])))
+    {
+      bool is_duplicate;
+      if (likely(!table->file->is_fatal_error(err, HA_CHECK_DUP)))
+        continue;                           // Distinct elimination
+
+      if (create_internal_tmp_table_from_heap(thd, table,
+                                              tmp_table_param->start_recinfo,
+                                              &tmp_table_param->recinfo,
+                                              err, 1, &is_duplicate))
+        DBUG_RETURN(1);
+      if (is_duplicate)
+        continue;
+    }
+  }
+
+  if (err != 0 && err != HA_ERR_END_OF_FILE)
+    goto error;
+
+  if ((err= handler->end_scan()))
+    goto error_2;
+
+  DBUG_RETURN(0);
+
+error:
+  handler->end_scan();
+error_2:
+  handler->print_error(err, MYF(0));
+  DBUG_RETURN(-1);                              // Error not sent to client
+}
+