Merge rurik.mysql.com:/home/igor/dev/mysql-4.1-0

into  rurik.mysql.com:/home/igor/dev/mysql-5.0-0


mysql-test/t/having.test:
  Auto merged
mysql-test/r/having.result:
  Manual merge
sql/sql_lex.cc:
  Manual merge
sql/sql_lex.h:
  Manual merge
sql/sql_prepare.cc:
  Manual merge
sql/sql_select.cc:
  Manual merge

mysql-test/r/having.result

@@ -141,6 +141,40 @@ SUM(a)
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 DROP TABLE t1;
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+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (1), (2), (1), (3), (2), (1);
+SELECT a FROM t1 GROUP BY a HAVING a > 1;
+a
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+SELECT a FROM t1 GROUP BY a HAVING 1 != 1 AND a > 1;
+a
+SELECT 0 AS x, a FROM t1 GROUP BY x,a HAVING x=1 AND a > 1;
+x	a
+EXPLAIN SELECT a FROM t1 GROUP BY a HAVING 1 != 1 AND a > 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible HAVING
+EXPLAIN SELECT 0 AS x, a FROM t1 GROUP BY x,a HAVING x=1 AND a > 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible HAVING
+DROP table t1;
 create table t1 (col1 int, col2 varchar(5), col_t1 int);
 create table t2 (col1 int, col2 varchar(5), col_t2 int);
 create table t3 (col1 int, col2 varchar(5), col_t3 int);

mysql-test/t/having.test

@@ -135,6 +135,22 @@ SELECT SUM(a) FROM t1 GROUP BY a HAVING SUM(a);
 
 DROP TABLE t1;
 
+#
+# Bug #14927: HAVING clause containing constant false conjunct
+#
+
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (1), (2), (1), (3), (2), (1);
+
+SELECT a FROM t1 GROUP BY a HAVING a > 1;
+SELECT a FROM t1 GROUP BY a HAVING 1 != 1 AND a > 1;
+SELECT 0 AS x, a FROM t1 GROUP BY x,a HAVING x=1 AND a > 1;
+
+EXPLAIN SELECT a FROM t1 GROUP BY a HAVING 1 != 1 AND a > 1;
+EXPLAIN SELECT 0 AS x, a FROM t1 GROUP BY x,a HAVING x=1 AND a > 1;
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+DROP table t1;  
+
 # End of 4.1 tests
 
 #

sql/sql_lex.cc

@@ -1122,7 +1122,7 @@ void st_select_lex::init_query()
   embedding= leaf_tables= 0;
   item_list.empty();
   join= 0;
-  having= where= prep_where= 0;
+  having= prep_having= where= prep_where= 0;
   olap= UNSPECIFIED_OLAP_TYPE;
   having_fix_field= 0;
   context.select_lex= this;

sql/sql_lex.h

@@ -474,6 +474,7 @@ class st_select_lex: public st_select_lex_node
   char *db;
   Item *where, *having;                         /* WHERE & HAVING clauses */
   Item *prep_where; /* saved WHERE clause for prepared statement processing */
+  Item *prep_having;/* saved HAVING clause for prepared statement processing */
   /* point on lex in which it was created, used in view subquery detection */
   st_lex *parent_lex;
   enum olap_type olap;

sql/sql_prepare.cc

@@ -1862,6 +1862,96 @@ void mysql_stmt_prepare(THD *thd, const char *packet, uint packet_length)
   {
     /* Statement map deletes statement on erase */
     thd->stmt_map.erase(stmt);
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   }
   else
     mysql_log.write(thd, COM_STMT_PREPARE, "[%lu] %s", stmt->id, packet);
@@ -1955,11 +2045,14 @@ static const char *get_dynamic_sql_string(LEX *lex, uint *query_len)
   }
   else
   {
-    query_str= lex->prepared_stmt_code.str;
-    *query_len= lex->prepared_stmt_code.length;
-  }
-end:
-  return query_str;
+    stmt->setup_set_params();
+    SELECT_LEX *sl= stmt->lex->all_selects_list;
+    for (; sl; sl= sl->next_select_in_list())
+    {
+      /*
+        during query optimisation.
+      */
+      sl->prep_where= sl->where;
 }
 
 
@@ -2066,14 +2159,19 @@ void reinit_stmt_before_use(THD *thd, LEX *lex)
       sl->exclude_from_table_unique_test= FALSE;
 
       /*
-        Copy WHERE clause pointers to avoid damaging they by optimisation
+        Copy WHERE, HAVING clause pointers to avoid damaging them by optimisation
       */
-      if (sl->prep_where)
-      {
-        sl->where= sl->prep_where->copy_andor_structure(thd);
-        sl->where->cleanup();
-      }
-      DBUG_ASSERT(sl->join == 0);
+     if (sl->prep_where)
+     {
+       sl->where= sl->prep_where->copy_andor_structure(thd);
+       sl->where->cleanup();
+     }
+     if (sl->prep_having)
+     {
+       sl->having= sl->prep_having->copy_andor_structure(thd);
+       sl->having->cleanup();
+     }
+     DBUG_ASSERT(sl->join == 0);
       ORDER *order;
       /* Fix GROUP list */
       for (order= (ORDER *)sl->group_list.first; order; order= order->next)

sql/sql_select.cc

@@ -612,6 +612,7 @@ JOIN::optimize()
     build_bitmap_for_nested_joins(join_list, 0);
 
     sel->prep_where= conds ? conds->copy_andor_structure(thd) : 0;
+    sel->prep_having= having ? having->copy_andor_structure(thd) : 0;
 
     if (arena)
       thd->restore_active_arena(arena, &backup);
@@ -625,13 +626,26 @@ JOIN::optimize()
     DBUG_RETURN(1);
   }
 
-  if (cond_value == Item::COND_FALSE ||
-      (!unit->select_limit_cnt && !(select_options & OPTION_FOUND_ROWS)))
-  {						/* Impossible cond */
-    DBUG_PRINT("info", ("Impossible WHERE"));
-    zero_result_cause= "Impossible WHERE";
-    error= 0;
-    DBUG_RETURN(0);
+  {
+    Item::cond_result having_value;
+    having= optimize_cond(thd, having, &having_value);
+    if (thd->net.report_error)
+    {
+      error= 1;
+      DBUG_PRINT("error",("Error from optimize_cond"));
+      DBUG_RETURN(1);
+    }
+
+    if (cond_value == Item::COND_FALSE || having_value == Item::COND_FALSE || 
+        (!unit->select_limit_cnt && !(select_options & OPTION_FOUND_ROWS)))
+    {						/* Impossible cond */
+      DBUG_PRINT("info", (having_value == Item::COND_FALSE ? 
+                            "Impossible HAVING" : "Impossible WHERE"));
+      zero_result_cause=  ?
+                           "Impossible HAVING" : "Impossible WHERE";
+      error= 0;
+      DBUG_RETURN(0);
+    }
   }
 
   /* Optimize count(*), min() and max() */