MDEV-11952 Oracle-style packages: stage#5mariadb-10.3.5bb-10.3-compatibility

- CREATE PACKAGE [BODY] statements are now
  entirely written to mysql.proc with type='PACKAGE' and type='PACKAGE BODY'.
- CREATE PACKAGE BODY now supports IF NOT EXISTS
- DROP PACKAGE BODY now supports IF EXISTS
- CREATE OR REPLACE PACKAGE [BODY] is now supported
- CREATE PACKAGE [BODY] now support the DEFINER clause:

    CREATE DEFINER user@host PACKAGE pkg ... END;
    CREATE DEFINER user@host PACKAGE BODY pkg ... END;

- CREATE PACKAGE [BODY] now supports SQL SECURITY and COMMENT clauses, e.g.:

    CREATE PACKAGE p1 SQL SECURITY INVOKER COMMENT "comment" AS ... END;

- Package routines are now created from the package CREATE PACKAGE BODY
  statement and don't produce individual records in mysql.proc.

- CREATE PACKAGE BODY now supports package-wide variables.
  Package variables can be read and set inside package routines.
  Package variables are stored in a separate sp_rcontext,
  which is cached in THD on the first packate routine call.

- CREATE PACKAGE BODY now supports the initialization section.

- All public routines (i.e. declared in CREATE PACKAGE)
  must have implementations in CREATE PACKAGE BODY

- Only public package routines are available outside of the package

- {CREATE|DROP} PACKAGE [BODY] now respects CREATE ROUTINE and ALTER ROUTINE
  privileges

- "GRANT EXECUTE ON PACKAGE BODY pkg" is now supported

- SHOW CREATE PACKAGE [BODY] is now supported

- SHOW PACKAGE [BODY] STATUS is now supported

- CREATE and DROP for PACKAGE [BODY] now works for non-current databases

- mysqldump now supports packages

- "SHOW {PROCEDURE|FUNCTION) CODE pkg.routine" now works for package routines

- "SHOW PACKAGE BODY CODE pkg" now works (the package initialization section)

- A new package body level MDL was added

- Recursive calls for package procedures are now possible

- Routine forward declarations in CREATE PACKATE BODY are now supported.

- Package body variables now work as SP OUT parameters

- Package body variables now work as SELECT INTO targets

- Package body variables now support ROW, %ROWTYPE, %TYPE

1 files changed, 27 insertions, 0 deletions

diff --git a/sql/sp_rcontext.cc b/sql/sp_rcontext.cc
index 4009f8dce30..2e9ae23d7f9 100644
--- a/sql/sp_rcontext.cc
+++ b/sql/sp_rcontext.cc
@@ -30,6 +30,33 @@
 #include "sql_acl.h"                        // SELECT_ACL
 #include "sql_parse.h"                      // check_table_access
 
+
+Sp_rcontext_handler_local sp_rcontext_handler_local;
+Sp_rcontext_handler_package_body sp_rcontext_handler_package_body;
+
+sp_rcontext *Sp_rcontext_handler_local::get_rcontext(sp_rcontext *ctx) const
+{
+  return ctx;
+}
+
+sp_rcontext *Sp_rcontext_handler_package_body::get_rcontext(sp_rcontext *ctx) const
+{
+  return ctx->m_sp->m_parent->m_rcontext;
+}
+
+const LEX_CSTRING *Sp_rcontext_handler_local::get_name_prefix() const
+{
+  return &empty_clex_str;
+}
+
+const LEX_CSTRING *Sp_rcontext_handler_package_body::get_name_prefix() const
+{
+  static const LEX_CSTRING sp_package_body_variable_prefix_clex_str=
+                           {C_STRING_WITH_LEN("PACKAGE_BODY.")};
+  return &sp_package_body_variable_prefix_clex_str;
+}
+
+
 ///////////////////////////////////////////////////////////////////////////
 // sp_rcontext implementation.
 ///////////////////////////////////////////////////////////////////////////