Fix for BUG#31035: select from function, group by result crasher.

This actually, fix for the patch for bug-27354. The problem with
the patch was that Item_func_sp::used_tables() was updated, but
Item_func_sp::const_item() was not. So, for Item_func_sp, we had
the following inconsistency:
  - used_tables() returned RAND_TABLE, which means that the item
    can produce "random" results;
  - but const_item() returned TRUE, which means that the item is
    a constant one.

The fix is to change Item_func_sp::const_item() behaviour: it must
return TRUE (an item is a constant one) only if a stored function
is deterministic and each of its arguments (if any) is a constant
item.


mysql-test/r/sp.result:
  Update result file.
mysql-test/t/sp.test:
  Add test cases for BUG-31035, BUG-31191, BUG-31226
sql/item_func.cc:
  Make Item::const_item() be consistent with Item::used_tables().

mysql-test/r/sp.result

@@ -6367,4 +6367,180 @@ DROP TABLE t1;
 
 DROP PROCEDURE p1;
 DROP PROCEDURE p2;
+
+#
+# Bug#31035.
+#
+
+#
+# - Prepare.
+#
+
+DROP TABLE IF EXISTS t1;
+DROP FUNCTION IF EXISTS f1;
+DROP FUNCTION IF EXISTS f2;
+DROP FUNCTION IF EXISTS f3;
+DROP FUNCTION IF EXISTS f4;
+
+#
+# - Create required objects.
+#
+
+CREATE TABLE t1(c1 INT);
+
+INSERT INTO t1 VALUES (1), (2), (3);
+
+CREATE FUNCTION f1()
+RETURNS INT
+NOT DETERMINISTIC
+RETURN 1;
+
+CREATE FUNCTION f2(p INT)
+RETURNS INT
+NOT DETERMINISTIC
+RETURN 1;
+
+CREATE FUNCTION f3()
+RETURNS INT
+DETERMINISTIC
+RETURN 1;
+
+CREATE FUNCTION f4(p INT)
+RETURNS INT
+DETERMINISTIC
+RETURN 1;
+
+#
+# - Check.
+#
+
+SELECT f1() AS a FROM t1 GROUP BY a;
+a
+1
+
+SELECT f2(@a) AS a FROM t1 GROUP BY a;
+a
+1
+
+SELECT f3() AS a FROM t1 GROUP BY a;
+a
+1
+
+SELECT f4(0) AS a FROM t1 GROUP BY a;
+a
+1
+
+SELECT f4(@a) AS a FROM t1 GROUP BY a;
+a
+1
+
+#
+# - Cleanup.
+#
+
+DROP TABLE t1;
+DROP FUNCTION f1;
+DROP FUNCTION f2;
+DROP FUNCTION f3;
+DROP FUNCTION f4;
+
+#
+# Bug#31191.
+#
+
+#
+# - Prepare.
+#
+
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+DROP FUNCTION IF EXISTS f1;
+
+#
+# - Create required objects.
+#
+
+CREATE TABLE t1 (
+id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
+barcode INT(8) UNSIGNED ZEROFILL nOT NULL,
+PRIMARY KEY  (id),
+UNIQUE KEY barcode (barcode)
+);
+
+INSERT INTO t1 (id, barcode) VALUES (1, 12345678);
+INSERT INTO t1 (id, barcode) VALUES (2, 12345679);
+
+CREATE TABLE test.t2 (
+id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
+barcode BIGINT(11) UNSIGNED ZEROFILL NOT NULL,
+PRIMARY KEY  (id)
+);
+
+INSERT INTO test.t2 (id, barcode) VALUES (1, 12345106708);
+INSERT INTO test.t2 (id, barcode) VALUES (2, 12345106709);
+
+CREATE FUNCTION f1(p INT(8))
+RETURNS BIGINT(11) UNSIGNED
+READS SQL DATA
+RETURN FLOOR(p/1000)*1000000 + 100000 + FLOOR((p MOD 1000)/10)*100 + (p MOD 10);
+
+#
+# - Check.
+#
+
+SELECT DISTINCT t1.barcode, f1(t1.barcode)
+FROM t1
+INNER JOIN t2
+ON f1(t1.barcode) = t2.barcode
+WHERE t1.barcode=12345678;
+barcode	f1(t1.barcode)
+12345678	12345106708
+
+#
+# - Cleanup.
+#
+
+DROP TABLE t1;
+DROP TABLE t2;
+DROP FUNCTION f1;
+
+#
+# Bug#31226.
+#
+
+#
+# - Prepare.
+#
+
+DROP TABLE IF EXISTS t1;
+DROP FUNCTION IF EXISTS f1;
+
+#
+# - Create required objects.
+#
+
+CREATE TABLE t1(id INT);
+
+INSERT INTO t1 VALUES (1), (2), (3);
+
+CREATE FUNCTION f1()
+RETURNS DATETIME
+NOT DETERMINISTIC NO SQL
+RETURN NOW();
+
+#
+# - Check.
+#
+
+SELECT f1() FROM t1 GROUP BY 1;
+f1()
+<timestamp>
+
+#
+# - Cleanup.
+#
+
+DROP TABLE t1;
+DROP FUNCTION f1;
+
 End of 5.0 tests

mysql-test/t/sp.test

@@ -7354,4 +7354,294 @@ DROP TABLE t1;
 DROP PROCEDURE p1;
 DROP PROCEDURE p2;
 
+###########################################################################
+
+#
+# Bug#31035: select from function, group by result crasher.
+#
+
+###########################################################################
+
+--echo
+
+--echo #
+--echo # Bug#31035.
+--echo #
+
+--echo
+
+--echo #
+--echo # - Prepare.
+--echo #
+
+--echo
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+DROP FUNCTION IF EXISTS f1;
+DROP FUNCTION IF EXISTS f2;
+DROP FUNCTION IF EXISTS f3;
+DROP FUNCTION IF EXISTS f4;
+--enable_warnings
+
+--echo
+
+--echo #
+--echo # - Create required objects.
+--echo #
+
+--echo
+
+CREATE TABLE t1(c1 INT);
+
+--echo
+
+INSERT INTO t1 VALUES (1), (2), (3);
+
+--echo
+
+CREATE FUNCTION f1()
+  RETURNS INT
+  NOT DETERMINISTIC
+    RETURN 1;
+
+--echo
+
+CREATE FUNCTION f2(p INT)
+  RETURNS INT
+  NOT DETERMINISTIC
+    RETURN 1;
+
+--echo
+
+CREATE FUNCTION f3()
+  RETURNS INT
+  DETERMINISTIC
+    RETURN 1;
+
+--echo
+
+CREATE FUNCTION f4(p INT)
+  RETURNS INT
+  DETERMINISTIC
+    RETURN 1;
+
+--echo
+
+--echo #
+--echo # - Check.
+--echo #
+
+--echo
+
+# Not deterministic function, no arguments.
+
+SELECT f1() AS a FROM t1 GROUP BY a;
+
+--echo
+
+# Not deterministic function, non-constant argument.
+
+SELECT f2(@a) AS a FROM t1 GROUP BY a;
+
+--echo
+
+# Deterministic function, no arguments.
+
+SELECT f3() AS a FROM t1 GROUP BY a;
+
+--echo
+
+# Deterministic function, constant argument.
+
+SELECT f4(0) AS a FROM t1 GROUP BY a;
+
+--echo
+
+# Deterministic function, non-constant argument.
+
+SELECT f4(@a) AS a FROM t1 GROUP BY a;
+
+--echo
+
+--echo #
+--echo # - Cleanup.
+--echo #
+
+--echo
+
+DROP TABLE t1;
+DROP FUNCTION f1;
+DROP FUNCTION f2;
+DROP FUNCTION f3;
+DROP FUNCTION f4;
+
+--echo
+
+###########################################################################
+
+#
+# Bug#31191: JOIN in combination with stored function crashes the server.
+#
+
+###########################################################################
+
+--echo #
+--echo # Bug#31191.
+--echo #
+
+--echo
+
+--echo #
+--echo # - Prepare.
+--echo #
+
+--echo
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+DROP FUNCTION IF EXISTS f1;
+--enable_warnings
+
+--echo
+
+--echo #
+--echo # - Create required objects.
+--echo #
+
+--echo
+
+CREATE TABLE t1 (
+   id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
+   barcode INT(8) UNSIGNED ZEROFILL nOT NULL,
+   PRIMARY KEY  (id),
+   UNIQUE KEY barcode (barcode)
+);
+
+--echo
+
+INSERT INTO t1 (id, barcode) VALUES (1, 12345678);
+INSERT INTO t1 (id, barcode) VALUES (2, 12345679);
+
+--echo
+
+CREATE TABLE test.t2 (
+   id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
+   barcode BIGINT(11) UNSIGNED ZEROFILL NOT NULL,
+   PRIMARY KEY  (id)
+);
+
+--echo
+
+INSERT INTO test.t2 (id, barcode) VALUES (1, 12345106708);
+INSERT INTO test.t2 (id, barcode) VALUES (2, 12345106709);
+
+--echo
+
+CREATE FUNCTION f1(p INT(8))
+  RETURNS BIGINT(11) UNSIGNED
+  READS SQL DATA
+    RETURN FLOOR(p/1000)*1000000 + 100000 + FLOOR((p MOD 1000)/10)*100 + (p MOD 10);
+
+--echo
+
+--echo #
+--echo # - Check.
+--echo #
+
+--echo
+
+SELECT DISTINCT t1.barcode, f1(t1.barcode)
+FROM t1
+INNER JOIN t2
+ON f1(t1.barcode) = t2.barcode
+WHERE t1.barcode=12345678;
+
+--echo
+
+--echo #
+--echo # - Cleanup.
+--echo #
+
+--echo
+
+DROP TABLE t1;
+DROP TABLE t2;
+DROP FUNCTION f1;
+
+--echo
+
+###########################################################################
+
+#
+# Bug#31226: Group by function crashes mysql.
+#
+
+###########################################################################
+
+--echo #
+--echo # Bug#31226.
+--echo #
+
+--echo
+
+--echo #
+--echo # - Prepare.
+--echo #
+
+--echo
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+DROP FUNCTION IF EXISTS f1;
+--enable_warnings
+
+--echo
+
+--echo #
+--echo # - Create required objects.
+--echo #
+
+--echo
+
+CREATE TABLE t1(id INT);
+
+--echo
+
+INSERT INTO t1 VALUES (1), (2), (3);
+
+--echo
+
+CREATE FUNCTION f1()
+  RETURNS DATETIME
+  NOT DETERMINISTIC NO SQL
+    RETURN NOW();
+
+--echo
+
+--echo #
+--echo # - Check.
+--echo #
+
+--echo
+
+--replace_column 1 <timestamp>
+SELECT f1() FROM t1 GROUP BY 1;
+
+--echo
+
+--echo #
+--echo # - Cleanup.
+--echo #
+
+--echo
+
+DROP TABLE t1;
+DROP FUNCTION f1;
+
+--echo
+
+###########################################################################
+
 --echo End of 5.0 tests

sql/item_func.cc

@@ -5583,8 +5583,13 @@ Item_func_sp::fix_fields(THD *thd, Item **ref)
     
 #endif /* ! NO_EMBEDDED_ACCESS_CHECKS */
   }
+
   if (!m_sp->m_chistics->detistic)
-   used_tables_cache |= RAND_TABLE_BIT;
+  {
+    used_tables_cache |= RAND_TABLE_BIT;
+    const_item_cache= FALSE;
+  }
+
   DBUG_RETURN(res);
 }
 
@@ -5592,6 +5597,10 @@ Item_func_sp::fix_fields(THD *thd, Item **ref)
 void Item_func_sp::update_used_tables()
 {
   Item_func::update_used_tables();
+
   if (!m_sp->m_chistics->detistic)
-   used_tables_cache |= RAND_TABLE_BIT;
+  {
+    used_tables_cache |= RAND_TABLE_BIT;
+    const_item_cache= FALSE;
+  }
 }