MDEV-11935: Queries in stored procedures with and EXISTS(SELECT * FROM VIEW)...

MDEV-11935: Queries in stored procedures with and EXISTS(SELECT * FROM VIEW) crashes and closes hte conneciton.

Use correct start point even for taken out from subselect items in process of exists2in conversion.

mysql-test/r/sp.result

@@ -7952,3 +7952,41 @@ set global table_open_cache= @tmp_toc;
 set global table_definition_cache= @tmp_tdc;
 drop procedure p1;
 drop table t1,t2,t3,t4,t5,t6;
+#
+# MDEV-11935: Queries in stored procedures with and
+# EXISTS(SELECT * FROM VIEW) crashes and closes hte conneciton.
+#
+CREATE TABLE ANY_TABLE (
+ENTITY_UID    BIGINT NOT NULL
+);
+CREATE TABLE SECURITY_PATH(
+origid BIGINT UNSIGNED NOT NULL,
+destid BIGINT UNSIGNED NOT NULL,
+KEY (destid)
+);
+CREATE VIEW ENTITY_ACCESS (
+ENTITY_UID,
+OWNER_UID
+) AS
+SELECT SP1.origid,
+SP2.destid
+FROM SECURITY_PATH SP1
+JOIN SECURITY_PATH SP2 ON SP1.destid = SP2.origid
+;
+CREATE PROCEDURE SP_EXAMPLE_SELECT ()
+BEGIN
+SELECT *
+FROM ANY_TABLE AT1
+WHERE EXISTS ( SELECT *
+FROM ENTITY_ACCESS EA
+WHERE AT1.ENTITY_UID = EA.ENTITY_UID
+AND   EA.OWNER_UID IS NULL );
+END
+//
+CALL SP_EXAMPLE_SELECT ();
+ENTITY_UID
+CALL SP_EXAMPLE_SELECT ();
+ENTITY_UID
+drop procedure SP_EXAMPLE_SELECT;
+drop view ENTITY_ACCESS;
+drop table ANY_TABLE, SECURITY_PATH;

mysql-test/t/sp.test

@@ -9422,3 +9422,43 @@ drop procedure p1;
 
 drop table t1,t2,t3,t4,t5,t6;
 
+--echo #
+--echo # MDEV-11935: Queries in stored procedures with and
+--echo # EXISTS(SELECT * FROM VIEW) crashes and closes hte conneciton.
+--echo #
+
+CREATE TABLE ANY_TABLE (
+  ENTITY_UID    BIGINT NOT NULL
+);
+CREATE TABLE SECURITY_PATH(
+origid BIGINT UNSIGNED NOT NULL,
+destid BIGINT UNSIGNED NOT NULL,
+KEY (destid)
+);
+CREATE VIEW ENTITY_ACCESS (
+ENTITY_UID,
+OWNER_UID
+) AS
+SELECT SP1.origid,
+       SP2.destid
+FROM SECURITY_PATH SP1
+JOIN SECURITY_PATH SP2 ON SP1.destid = SP2.origid
+;
+--delimiter //
+CREATE PROCEDURE SP_EXAMPLE_SELECT ()
+BEGIN
+   SELECT *
+   FROM ANY_TABLE AT1
+   WHERE EXISTS ( SELECT *
+                  FROM ENTITY_ACCESS EA
+                  WHERE AT1.ENTITY_UID = EA.ENTITY_UID
+                  AND   EA.OWNER_UID IS NULL );
+END
+//
+--delimiter ;
+CALL SP_EXAMPLE_SELECT ();
+CALL SP_EXAMPLE_SELECT ();
+
+drop procedure SP_EXAMPLE_SELECT;
+drop view ENTITY_ACCESS;
+drop table ANY_TABLE, SECURITY_PATH;

sql/sql_base.cc

@@ -6628,7 +6628,7 @@ find_field_in_tables(THD *thd, Item_ident *item,
       if (!table_ref->belong_to_view &&
           !table_ref->belong_to_derived)
       {
-        SELECT_LEX *current_sel= thd->lex->current_select;
+        SELECT_LEX *current_sel= item->context->select_lex;
         SELECT_LEX *last_select= table_ref->select_lex;
         bool all_merged= TRUE;
         for (SELECT_LEX *sl= current_sel; sl && sl!=last_select;