MDEV-25397: JSON_TABLE: Unexpected ER_MIX_OF_GROUP_FUNC_AND_FIELDS

When doing name resolution, do the same what WHERE/ON clauses do:
they don't count in select_lex->non_agg_field_used().

mysql-test/suite/json/r/json_table.result

@@ -803,5 +803,16 @@ SELECT * FROM v;
 b
 DROP VIEW v;
 #
+# MDEV-25397: JSON_TABLE: Unexpected ER_MIX_OF_GROUP_FUNC_AND_FIELDS upon query with JOIN
+#
+set @save_sql_mode= @@sql_mode;
+SET sql_mode='ONLY_FULL_GROUP_BY';
+CREATE TABLE t1 (a TEXT);
+SELECT SUM(o) FROM t1 JOIN JSON_TABLE(t1.a, '$' COLUMNS(o FOR ORDINALITY)) jt;
+SUM(o)
+NULL
+set sql_mode=@save_sql_mode;
+drop table t1;
+#
 # End of 10.6 tests
 #

mysql-test/suite/json/t/json_table.test

@@ -698,6 +698,17 @@ SELECT * FROM v;
 
 DROP VIEW v;
 
+--echo #
+--echo # MDEV-25397: JSON_TABLE: Unexpected ER_MIX_OF_GROUP_FUNC_AND_FIELDS upon query with JOIN
+--echo #
+set @save_sql_mode= @@sql_mode;
+SET sql_mode='ONLY_FULL_GROUP_BY';
+CREATE TABLE t1 (a TEXT);
+SELECT SUM(o) FROM t1 JOIN JSON_TABLE(t1.a, '$' COLUMNS(o FOR ORDINALITY)) jt;
+
+set sql_mode=@save_sql_mode;
+drop table t1;
+
 --echo #
 --echo # End of 10.6 tests
 --echo #

sql/json_table.cc

@@ -1055,9 +1055,15 @@ int Table_function_json_table::setup(THD *thd, TABLE_LIST *sql_table,
     // table function reference
     m_context->ignored_tables= get_disallowed_table_deps(s_lex->join, t->map);
 
+    // Do the same what setup_without_group() does: do not count the referred
+    // fields in non_agg_field_used:
+    const bool saved_non_agg_field_used= s_lex->non_agg_field_used();
+
     res= m_json->fix_fields_if_needed(thd, &m_json);
 
     thd->lex->current_select->is_item_list_lookup= save_is_item_list_lookup;
+    s_lex->set_non_agg_field_used(saved_non_agg_field_used);
+
     if (res)
       return TRUE;
   }