From d1f9376229f0a615829a436cf6004840237d1e75 Mon Sep 17 00:00:00 2001
From: "kostja@dipika.(none)" <>
Date: Tue, 8 Apr 2008 20:01:20 +0400
Subject: Tentative implementation of WL#4165 Prepared statements: validation
 WL#4166 Prepared statements: automatic re-prepare Fixes Bug#27430 Crash in
 subquery code when in PS and table DDL changed after PREPARE Bug#27690
 Re-execution of prepared statement after table was replaced with a view
 crashes Bug#27420 A combination of PS and view operations cause error +
 assertion on shutdown

The basic idea of the patch is to keep track of table metadata between
prepared statement prepare and execute. If some table used in the statement
has changed, the prepared statement is re-prepared before execution.

See WL#4165 and WL#4166 contents and comments in the code for details
of the implementation.
---
 sql/my_decimal.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'sql/my_decimal.h')

diff --git a/sql/my_decimal.h b/sql/my_decimal.h
index 1885036f42b..b096abaf8ae 100644
--- a/sql/my_decimal.h
+++ b/sql/my_decimal.h
@@ -114,6 +114,14 @@ public:
   bool sign() const { return decimal_t::sign; }
   void sign(bool s) { decimal_t::sign= s; }
   uint precision() const { return intg + frac; }
+
+  /** Swap two my_decimal values */
+  void swap(my_decimal &rhs)
+  {
+    swap_variables(my_decimal, *this, rhs);
+    /* Swap the buffer pointers back */
+    swap_variables(decimal_digit_t *, buf, rhs.buf);
+  }
 };
 
 
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