MDEV-16978 Application-time periods: WITHOUT OVERLAPS

* The overlaps check is implemented on a handler level per row command.
  It creates a separate cursor (actually, another handler instance) and
  caches it inside the original handler, when ha_update_row or
  ha_insert_row is issued. Cursor closes on unlocking the handler.

* Containing the same key in index means unique constraint violation
  even in usual terms. So we fetch left and right neighbours and check
  that they have same key prefix, excluding from the key only the period part.
  If it doesnt match, then there's no such neighbour, and the check passes.
  Otherwise, we check if this neighbour intersects with the considered key.

* The check does not introduce new error and fails with ER_DUPP_KEY error.
  This might break REPLACE workflow and should be fixed separately

mysql-test/main/parser.result

@@ -1388,6 +1388,7 @@ CALL p1(name, 'SELECT name TRANSACTION FROM t1');
 CALL p1(name, 'SELECT name VALUE FROM t1');
 CALL p1(name, 'SELECT name VERSIONING FROM t1');
 CALL p1(name, 'SELECT name WITHOUT FROM t1');
+CALL p1(name, 'SELECT name OVERLAPS FROM t1');
 DROP TABLE t1;
 END;
 $$
@@ -1414,6 +1415,7 @@ SELECT date TRANSACTION FROM t1
 SELECT date VALUE FROM t1
 SELECT date VERSIONING FROM t1
 SELECT date WITHOUT FROM t1
+SELECT date OVERLAPS FROM t1
 CALL p2('history');
 BEGIN NOT ATOMIC DECLARE history INT; SET history=10; SELECT history; END
 10
@@ -1436,6 +1438,7 @@ SELECT history TRANSACTION FROM t1
 SELECT history VALUE FROM t1
 SELECT history VERSIONING FROM t1
 SELECT history WITHOUT FROM t1
+SELECT history OVERLAPS FROM t1
 CALL p2('next');
 BEGIN NOT ATOMIC DECLARE next INT; SET next=10; SELECT next; END
 10
@@ -1459,6 +1462,7 @@ SELECT next VALUE FROM t1
 Error	1064	You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'FROM t1' at line 1
 SELECT next VERSIONING FROM t1
 SELECT next WITHOUT FROM t1
+SELECT next OVERLAPS FROM t1
 CALL p2('period');
 BEGIN NOT ATOMIC DECLARE period INT; SET period=10; SELECT period; END
 10
@@ -1481,6 +1485,7 @@ SELECT period TRANSACTION FROM t1
 SELECT period VALUE FROM t1
 SELECT period VERSIONING FROM t1
 SELECT period WITHOUT FROM t1
+SELECT period OVERLAPS FROM t1
 CALL p2('previous');
 BEGIN NOT ATOMIC DECLARE previous INT; SET previous=10; SELECT previous; END
 10
@@ -1504,6 +1509,7 @@ SELECT previous VALUE FROM t1
 Error	1064	You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'FROM t1' at line 1
 SELECT previous VERSIONING FROM t1
 SELECT previous WITHOUT FROM t1
+SELECT previous OVERLAPS FROM t1
 CALL p2('system');
 BEGIN NOT ATOMIC DECLARE system INT; SET system=10; SELECT system; END
 10
@@ -1526,6 +1532,7 @@ SELECT system TRANSACTION FROM t1
 SELECT system VALUE FROM t1
 SELECT system VERSIONING FROM t1
 SELECT system WITHOUT FROM t1
+SELECT system OVERLAPS FROM t1
 CALL p2('system_time');
 BEGIN NOT ATOMIC DECLARE system_time INT; SET system_time=10; SELECT system_time; END
 10
@@ -1548,6 +1555,7 @@ SELECT system_time TRANSACTION FROM t1
 SELECT system_time VALUE FROM t1
 SELECT system_time VERSIONING FROM t1
 SELECT system_time WITHOUT FROM t1
+SELECT system_time OVERLAPS FROM t1
 CALL p2('time');
 BEGIN NOT ATOMIC DECLARE time INT; SET time=10; SELECT time; END
 10
@@ -1571,6 +1579,7 @@ SELECT time TRANSACTION FROM t1
 SELECT time VALUE FROM t1
 SELECT time VERSIONING FROM t1
 SELECT time WITHOUT FROM t1
+SELECT time OVERLAPS FROM t1
 CALL p2('timestamp');
 BEGIN NOT ATOMIC DECLARE timestamp INT; SET timestamp=10; SELECT timestamp; END
 10
@@ -1594,6 +1603,7 @@ SELECT timestamp TRANSACTION FROM t1
 SELECT timestamp VALUE FROM t1
 SELECT timestamp VERSIONING FROM t1
 SELECT timestamp WITHOUT FROM t1
+SELECT timestamp OVERLAPS FROM t1
 CALL p2('transaction');
 BEGIN NOT ATOMIC DECLARE transaction INT; SET transaction=10; SELECT transaction; END
 10
@@ -1616,6 +1626,7 @@ SELECT transaction TRANSACTION FROM t1
 SELECT transaction VALUE FROM t1
 SELECT transaction VERSIONING FROM t1
 SELECT transaction WITHOUT FROM t1
+SELECT transaction OVERLAPS FROM t1
 CALL p2('value');
 BEGIN NOT ATOMIC DECLARE value INT; SET value=10; SELECT value; END
 10
@@ -1638,6 +1649,7 @@ SELECT value TRANSACTION FROM t1
 SELECT value VALUE FROM t1
 SELECT value VERSIONING FROM t1
 SELECT value WITHOUT FROM t1
+SELECT value OVERLAPS FROM t1
 CALL p2('versioning');
 BEGIN NOT ATOMIC DECLARE versioning INT; SET versioning=10; SELECT versioning; END
 10
@@ -1660,6 +1672,7 @@ SELECT versioning TRANSACTION FROM t1
 SELECT versioning VALUE FROM t1
 SELECT versioning VERSIONING FROM t1
 SELECT versioning WITHOUT FROM t1
+SELECT versioning OVERLAPS FROM t1
 CALL p2('without');
 BEGIN NOT ATOMIC DECLARE without INT; SET without=10; SELECT without; END
 10
@@ -1682,6 +1695,30 @@ SELECT without TRANSACTION FROM t1
 SELECT without VALUE FROM t1
 SELECT without VERSIONING FROM t1
 SELECT without WITHOUT FROM t1
+SELECT without OVERLAPS FROM t1
+CALL p2('overlaps');
+BEGIN NOT ATOMIC DECLARE overlaps INT; SET overlaps=10; SELECT overlaps; END
+10
+SELECT overlaps FROM t1
+SELECT overlaps 'alias' FROM t1
+SELECT overlaps()
+Error	1582	Incorrect parameter count in the call to native function 'overlaps()'
+SELECT overlaps.overlaps()
+Error	1630	FUNCTION overlaps.overlaps does not exist. Check the 'Function Name Parsing and Resolution' section in the Reference Manual
+SELECT overlaps DATE FROM t1
+SELECT overlaps HISTORY FROM t1
+SELECT overlaps NEXT FROM t1
+SELECT overlaps PERIOD FROM t1
+SELECT overlaps PREVIOUS FROM t1
+SELECT overlaps SYSTEM FROM t1
+SELECT overlaps SYSTEM_TIME FROM t1
+SELECT overlaps TIME FROM t1
+SELECT overlaps TIMESTAMP FROM t1
+SELECT overlaps TRANSACTION FROM t1
+SELECT overlaps VALUE FROM t1
+SELECT overlaps VERSIONING FROM t1
+SELECT overlaps WITHOUT FROM t1
+SELECT overlaps OVERLAPS FROM t1
 DROP PROCEDURE p2;
 DROP PROCEDURE p1;
 #