1 files changed, 103 insertions, 0 deletions
diff --git a/sql/records.h b/sql/records.h
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+++ b/sql/records.h
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+#ifndef SQL_RECORDS_H
+#define SQL_RECORDS_H 
+/* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
+
+   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
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+#ifdef USE_PRAGMA_INTERFACE
+#pragma interface                      /* gcc class implementation */
+#endif
+
+#include "table.h"
+
+struct st_join_table;
+class handler;
+class THD;
+class SQL_SELECT;
+class Copy_field;
+class SORT_INFO;
+
+struct READ_RECORD;
+
+void end_read_record(READ_RECORD *info);
+void free_cache(READ_RECORD *info);
+
+/**
+  A context for reading through a single table using a chosen access method:
+  index read, scan, etc, use of cache, etc.
+
+  Use by:
+  READ_RECORD read_record;
+  init_read_record(&read_record, ...);
+  while (read_record.read_record())
+  {
+    ...
+  }
+  end_read_record();
+*/
+
+struct READ_RECORD
+{
+  typedef int (*Read_func)(READ_RECORD*);
+  typedef void (*Unlock_row_func)(st_join_table *);
+  typedef int (*Setup_func)(struct st_join_table*);
+
+  TABLE *table;                                 /* Head-form */
+  Unlock_row_func unlock_row;
+  Read_func read_record_func;
+  THD *thd;
+  SQL_SELECT *select;
+  uint ref_length, reclength, rec_cache_size, error_offset;
+
+  /**
+    Counting records when reading result from filesort().
+    Used when filesort leaves the result in the filesort buffer.
+   */
+  ha_rows unpack_counter;
+
+  uchar *ref_pos;				/* pointer to form->refpos */
+  uchar *rec_buf;                /* to read field values  after filesort */
+  uchar	*cache,*cache_pos,*cache_end,*read_positions;
+
+  /*
+    Structure storing information about sorting
+  */
+  SORT_INFO *sort_info;
+  struct st_io_cache *io_cache;
+  bool print_error;
+
+  int read_record() { return read_record_func(this); }
+  uchar *record() const { return table->record[0]; }
+
+  /* 
+    SJ-Materialization runtime may need to read fields from the materialized
+    table and unpack them into original table fields:
+  */
+  Copy_field *copy_field;
+  Copy_field *copy_field_end;
+public:
+  READ_RECORD() : table(NULL), cache(NULL) {}
+  ~READ_RECORD() { end_read_record(this); }
+};
+
+bool init_read_record(READ_RECORD *info, THD *thd, TABLE *reg_form,
+		      SQL_SELECT *select, SORT_INFO *sort,
+                      int use_record_cache,
+                      bool print_errors, bool disable_rr_cache);
+bool init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table,
+                          bool print_error, uint idx, bool reverse);
+
+void rr_unlock_row(st_join_table *tab);
+
+#endif /* SQL_RECORDS_H */