MDEV-17963: Assertion `field_pos < field_count' failed in...

MDEV-17963: Assertion `field_pos < field_count' failed in Protocol_text::store, Assertion `field_handlers == 0 || field_pos < field_count'

The problem was that sp_head::MULTI_RESULTS was not set correctly for ANALYZE statement
with SELECT ... INTO variable.
This is a follow up fix for MDEV-7023

mysql-test/r/sp.result

@@ -8319,4 +8319,18 @@ UNION
 SELECT * FROM INFORMATION_SCHEMA.TABLES JOIN INFORMATION_SCHEMA.PARAMETERS;
 DROP FUNCTION f;
 DROP VIEW v;
+#
+# MDEV-17963: Assertion `field_pos < field_count' failed in Protocol_text::store,
+# Assertion `field_handlers == 0 || field_pos < field_count'
+#
+CREATE TABLE t1 (ct time);
+INSERT INTO t1 VALUES ('16:11:28');
+CREATE FUNCTION f1 () RETURNS varchar(100)
+BEGIN
+DECLARE xxx varchar(100);
+ANALYZE SELECT sum(ct) FROM t1 INTO xxx ;
+RETURN xxx;
+END|
+ERROR 0A000: Not allowed to return a result set from a function
+drop table t1;
 #End of 10.1 tests

mysql-test/t/sp.test

@@ -9840,4 +9840,24 @@ SELECT * FROM INFORMATION_SCHEMA.TABLES JOIN INFORMATION_SCHEMA.PARAMETERS;
 DROP FUNCTION f;
 DROP VIEW v;
 
+--echo #
+--echo # MDEV-17963: Assertion `field_pos < field_count' failed in Protocol_text::store,
+--echo # Assertion `field_handlers == 0 || field_pos < field_count'
+--echo #
+
+CREATE TABLE t1 (ct time);
+INSERT INTO t1 VALUES ('16:11:28');
+
+DELIMITER |;
+--error ER_SP_NO_RETSET
+CREATE FUNCTION f1 () RETURNS varchar(100)
+BEGIN
+DECLARE xxx varchar(100);
+ANALYZE SELECT sum(ct) FROM t1 INTO xxx ;
+RETURN xxx;
+END|
+
+DELIMITER ;|
+drop table t1;
+
 --echo #End of 10.1 tests

sql/sp_head.cc

@@ -212,7 +212,7 @@ sp_get_flags_for_command(LEX *lex)
 
   switch (lex->sql_command) {
   case SQLCOM_SELECT:
-    if (lex->result)
+    if (lex->result && !lex->analyze_stmt)
     {
       flags= 0;                      /* This is a SELECT with INTO clause */
       break;