Bug#49907: ALTER TABLE ... TRUNCATE PARTITION does not wait for

           locks on the table

Fixing the partitioning specifics after TRUNCATE TABLE in
bug-42643 was fixed.

Reorganize of code to decrease the size of the giant switch
in mysql_execute_command, and to prepare for future parser
reengineering. Moved code into Sql_statement objects.

Updated patch according to davi's review comments.

1 files changed, 26 insertions, 0 deletions

diff --git a/sql/sql_truncate.h b/sql/sql_truncate.h
index 11c07c7187c..b8b1d3da53d 100644
--- a/sql/sql_truncate.h
+++ b/sql/sql_truncate.h
@@ -20,4 +20,30 @@ struct TABLE_LIST;
 
 bool mysql_truncate_table(THD *thd, TABLE_LIST *table_ref);
 
+/**
+  Truncate_statement represents the TRUNCATE statement.
+*/
+class Truncate_statement : public Sql_statement
+{
+public:
+  /**
+    Constructor, used to represent a ALTER TABLE statement.
+    @param lex the LEX structure for this statement.
+  */
+  Truncate_statement(LEX *lex)
+    : Sql_statement(lex)
+  {}
+
+  ~Truncate_statement()
+  {}
+
+  /**
+    Execute a TRUNCATE statement at runtime.
+    @param thd the current thread.
+    @return false on success.
+  */
+  bool execute(THD *thd);
+};
+
+
 #endif