MDEV-13436 PREPARE doesn't work as expected & throws errors but MySQL is working fine

Now we allow derived in the from clause of subqueries so set
flag which prevent optimisation of subqueries during view
creation before derived processing so subquery will be
correctly printed in the view .frm.

mysql-test/r/view.result

@@ -6624,5 +6624,28 @@ drop table procViewTable;
 use test;
 drop database bugTest;
 #
+# MDEV-13436: PREPARE doesn't work as expected & throws errors but
+# MySQL is working fine
+#
+create table t1 (a int);
+insert into t1 values (1),(2);
+SET @sql_query = "
+  CREATE VIEW v1 AS
+    SELECT * FROM (
+          SELECT CASE WHEN 1 IN (SELECT a from t1 where a < 2) THEN TRUE END AS testcase
+    ) testalias
+";
+PREPARE stmt FROM @sql_query;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+show create view v1;
+View	Create View	character_set_client	collation_connection
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `testalias`.`testcase` AS `testcase` from (select case when 1 in (select `test`.`t1`.`a` from `test`.`t1` where `test`.`t1`.`a` < 2) then 1 end AS `testcase`) `testalias`	latin1	latin1_swedish_ci
+SELECT * FROM v1;
+testcase
+1
+drop view v1;
+drop table t1;
+#
 # End of 10.2 tests
 #

mysql-test/t/view.test

@@ -6344,6 +6344,27 @@ drop table procViewTable;
 use test;
 drop database bugTest;
 
+--echo #
+--echo # MDEV-13436: PREPARE doesn't work as expected & throws errors but
+--echo # MySQL is working fine
+--echo #
+
+create table t1 (a int);
+insert into t1 values (1),(2);
+SET @sql_query = "
+  CREATE VIEW v1 AS
+    SELECT * FROM (
+          SELECT CASE WHEN 1 IN (SELECT a from t1 where a < 2) THEN TRUE END AS testcase
+    ) testalias
+";
+PREPARE stmt FROM @sql_query;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+show create view v1;
+SELECT * FROM v1;
+drop view v1;
+drop table t1;
+
 --echo #
 --echo # End of 10.2 tests
 --echo #

sql/sql_prepare.cc

@@ -2097,11 +2097,11 @@ static bool mysql_test_create_view(Prepared_statement *stmt)
   if (thd->open_temporary_tables(tables))
     goto err;
 
+  lex->context_analysis_only|= CONTEXT_ANALYSIS_ONLY_VIEW;
   if (open_normal_and_derived_tables(thd, tables, MYSQL_OPEN_FORCE_SHARED_MDL,
                                      DT_PREPARE))
     goto err;
 
-  lex->context_analysis_only|=  CONTEXT_ANALYSIS_ONLY_VIEW;
   res= select_like_stmt_test(stmt, 0, 0);
 
 err: