MDEV-6396: ANALYZE INSERT/REPLACE is accepted, but does not produce a plan

Add ANALYZE STMT handling into INSERT command.

mysql-test/r/analyze_stmt.result

@@ -259,3 +259,20 @@ analyze delete from t1 returning *;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	0	0	100.00	100.00	
 drop table t1;
+#
+# MDEV-6396: ANALYZE INSERT/REPLACE is accepted, but does not produce a plan
+#
+create table t1 (a int primary key, b int);
+analyze insert into t1 values (1,1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
+1	INSERT	t1	ALL	NULL	NULL	NULL	NULL	NULL	NULL	100.00	100.00	NULL
+select * from t1;
+a	b
+1	1
+analyze replace t1 values (1,2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
+1	INSERT	t1	ALL	NULL	NULL	NULL	NULL	NULL	NULL	100.00	100.00	NULL
+select * from t1;
+a	b
+1	2
+drop table t1;

mysql-test/t/analyze_stmt.test

@@ -206,3 +206,14 @@ create table t1 (i int);
 analyze delete from t1 returning *;
 drop table t1;
 
+--echo #
+--echo # MDEV-6396: ANALYZE INSERT/REPLACE is accepted, but does not produce a plan
+--echo #
+create table t1 (a int primary key, b int);
+analyze insert into t1 values (1,1);
+select * from t1;
+
+analyze replace t1 values (1,2);
+select * from t1;
+drop table t1;
+

sql/sql_insert.cc

@@ -1100,6 +1100,11 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
 
   if (error)
     goto abort;
+  if (thd->lex->analyze_stmt)
+  {
+    retval= thd->lex->explain->send_explain(thd);
+    goto abort;
+  }
   if (values_list.elements == 1 && (!(thd->variables.option_bits & OPTION_WARNINGS) ||
 				    !thd->cuted_fields))
   {