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On Linux ./mtr --ps-protocol thread_id_overflow gives:
main.thread_id_overflow [ fail ]
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Test ended at 2018-03-29 19:47:18
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CURRENT_TEST: main.thread_id_overflow
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--- /home/svoj/devel/maria/mariadb/mysql-test/r/thread_id_overflow.result 2018-03-29 19:44:00.133283709 +0400
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+++ /home/svoj/devel/maria/mariadb/mysql-test/r/thread_id_overflow.reject 2018-03-29 19:47:18.017905411 +0400
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@@ -9,7 +9,7 @@
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connection con3;
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SELECT CONNECTION_ID();
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CONNECTION_ID()
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-4294967294
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+-2
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connection default;
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SET GLOBAL DEBUG_DBUG=@orig_debug;
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connect con4, localhost,root;
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There seem to be no problems until the value gets to CONNECTION_ID(). This patch helps, but I fail to understand why original code works in normal mode:
diff --git a/sql/item_func.h b/sql/item_func.h
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index f33b936..6be2a32 100644
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--- a/sql/item_func.h
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+++ b/sql/item_func.h
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@@ -849,7 +849,7 @@ class Item_func_connection_id :public Item_long_func
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longlong value;
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public:
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- Item_func_connection_id(THD *thd): Item_long_func(thd) {}
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+ Item_func_connection_id(THD *thd): Item_long_func(thd) { unsigned_flag= 1; }
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const char *func_name() const { return "connection_id"; }
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void fix_length_and_dec();
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bool fix_fields(THD *thd, Item **ref);
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