Bug#31210 - INSERT DELAYED crashes server when used on

              partitioned table
  
Post-pushbuild fix
  
Pushbuild detected a new need for lex initialization in
embedded server.

Fixed test for INSERT DELAYED in partitions_hash.test so that
it works with embedded server.


libmysqld/lib_sql.cc:
  Bug#31210 - INSERT DELAYED crashes server when used on
                  partitioned table
  Initialized lex for later use in open_table().
mysql-test/r/partition_hash.result:
  Bug#31210 - INSERT DELAYED crashes server when used on
                  partitioned table
  Fixed test result for embedded server.
mysql-test/t/partition_hash.test:
  Bug#31210 - INSERT DELAYED crashes server when used on
                  partitioned table
  Fixed test for embedded server.

libmysqld/lib_sql.cc

@@ -94,6 +94,7 @@ emb_advanced_command(MYSQL *mysql, enum enum_server_command command,
   thd->current_stmt= stmt;
 
   thd->store_globals();				// Fix if more than one connect
+  lex_start(thd);
   /* 
      We have to call free_old_query before we start to fill mysql->fields 
      for new query. In the case of embedded server we collect field data

mysql-test/r/partition_hash.result

@@ -185,5 +185,4 @@ c1	c2	c3
 drop table t1;
 CREATE TABLE t1 (c1 INT) ENGINE=MyISAM PARTITION BY HASH(c1) PARTITIONS 1;
 INSERT DELAYED INTO t1 VALUES (1);
-ERROR HY000: Table storage engine for 't1' doesn't have this option
 DROP TABLE t1;

mysql-test/t/partition_hash.test

@@ -148,7 +148,9 @@ drop table t1;
 # Bug#31210 - INSERT DELAYED crashes server when used on partitioned table
 #
 CREATE TABLE t1 (c1 INT) ENGINE=MyISAM PARTITION BY HASH(c1) PARTITIONS 1;
---error ER_ILLEGAL_HA
+# The test succeeds in an embedded server because normal insert is done.
+# The test fails in a normal server with "engine doesn't have this option".
+--error 0, ER_ILLEGAL_HA
 INSERT DELAYED INTO t1 VALUES (1);
 DROP TABLE t1;