Backport of revno 2630.28.10, 2630.28.31, 2630.28.26, 2630.33.1,

2630.39.1, 2630.28.29, 2630.34.3, 2630.34.2, 2630.34.1, 2630.29.29,
2630.29.28, 2630.31.1, 2630.28.13, 2630.28.10, 2617.23.14 and
some other minor revisions.

This patch implements: 

WL#4264 "Backup: Stabilize Service Interface" -- all the
server prerequisites except si_objects.{h,cc} themselves (they can
be just copied over, when needed).

WL#4435: Support OUT-parameters in prepared statements.

(and all issues in the initial patches for these two
tasks, that were discovered in pushbuild and during testing).

Bug#39519: mysql_stmt_close() should flush all data
associated with the statement.

After execution of a prepared statement, send OUT parameters of the invoked
stored procedure, if any, to the client.

When using the binary protocol, send the parameters in an additional result
set over the wire.  When using the text protocol, assign out parameters to
the user variables from the CALL(@var1, @var2, ...) specification.

The following refactoring has been made:
  - Protocol::send_fields() was renamed to Protocol::send_result_set_metadata();
  - A new Protocol::send_result_set_row() was introduced to incapsulate
    common functionality for sending row data.
  - Signature of Protocol::prepare_for_send() was changed: this operation
    does not need a list of items, the number of items is fully sufficient.

The following backward incompatible changes have been made:
  - CLIENT_MULTI_RESULTS is now enabled by default in the client;
  - CLIENT_PS_MULTI_RESUTLS is now enabled by default in the client.

1 files changed, 7 insertions, 0 deletions

diff --git a/include/mysql_com.h b/include/mysql_com.h
index 2641aeda205..82e230fc3fd 100644
--- a/include/mysql_com.h
+++ b/include/mysql_com.h
@@ -144,6 +144,7 @@ enum enum_server_command
 #define CLIENT_SECURE_CONNECTION 32768  /* New 4.1 authentication */
 #define CLIENT_MULTI_STATEMENTS (1UL << 16) /* Enable/disable multi-stmt support */
 #define CLIENT_MULTI_RESULTS    (1UL << 17) /* Enable/disable multi-results */
+#define CLIENT_PS_MULTI_RESULTS (1UL << 18) /* Multi-results in PS-protocol */
 
 #define CLIENT_SSL_VERIFY_SERVER_CERT (1UL << 30)
 #define CLIENT_REMEMBER_OPTIONS (1UL << 31)
@@ -167,6 +168,7 @@ enum enum_server_command
                            CLIENT_SECURE_CONNECTION | \
                            CLIENT_MULTI_STATEMENTS | \
                            CLIENT_MULTI_RESULTS | \
+                           CLIENT_PS_MULTI_RESULTS | \
                            CLIENT_SSL_VERIFY_SERVER_CERT | \
                            CLIENT_REMEMBER_OPTIONS)
 
@@ -205,6 +207,11 @@ enum enum_server_command
 #define SERVER_STATUS_METADATA_CHANGED 1024
 
 /**
+  To mark ResultSet containing output parameter values.
+*/
+#define SERVER_PS_OUT_PARAMS            4096
+
+/**
   Server status flags that must be cleared when starting
   execution of a new SQL statement.
   Flags from this set are only added to the