Automatic merge

client/mysql.cc

@@ -897,6 +897,7 @@ static COMMANDS commands[] = {
   { "LAST_INSERT_ID", 0, 0, 0, ""},
   { "ISSIMPLE", 0, 0, 0, ""},
   { "LAST_DAY", 0, 0, 0, ""},
+  { "LAST_VALUE", 0, 0, 0, ""},
   { "LCASE", 0, 0, 0, ""},
   { "LEAST", 0, 0, 0, ""},
   { "LENGTH", 0, 0, 0, ""},

mysql-test/r/last_value.result

+drop table if exists t1;
+drop database if exists mysqltest;
+CREATE TABLE t1 (a INT, b INT, c INT, d INT);
+INSERT INTO t1 VALUES (1,3,0,NULL),(2,2,0,NULL),(3,4,0,NULL),(4,2,0,NULL);
+SELECT * FROM t1;
+a	b	c	d
+1	3	0	NULL
+2	2	0	NULL
+3	4	0	NULL
+4	2	0	NULL
+UPDATE t1 SET c=LAST_VALUE(@last_a:=a,@last_b:=b,@last_c:=c,1), d=4211 WHERE c=0 ORDER BY b DESC LIMIT 1;
+SELECT @last_a, @last_b, @last_c;
+@last_a	@last_b	@last_c
+3	4	0
+SELECT * FROM t1;
+a	b	c	d
+1	3	0	NULL
+2	2	0	NULL
+3	4	1	4211
+4	2	0	NULL
+DROP TABLE t1;
+SELECT LAST_VALUE(@last_a:=1,@last_b:=1);
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					LAST_VALUE(@last_a:=1,@last_b:=1)	8	1	1	N	32897	0	63
+LAST_VALUE(@last_a:=1,@last_b:=1)
+1
+select @last_b;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					@last_b	8	20	1	Y	32896	0	63
+@last_b
+1
+SELECT LAST_VALUE(@last_a:=1,@last_b:=1.0);
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					LAST_VALUE(@last_a:=1,@last_b:=1.0)	246	4	3	N	32897	1	63
+LAST_VALUE(@last_a:=1,@last_b:=1.0)
+1.0
+select @last_b;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					@last_b	246	83	3	Y	32896	30	63
+@last_b
+1.0
+SELECT LAST_VALUE(@last_a:=1,@last_b:="hello");
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					LAST_VALUE(@last_a:=1,@last_b:="hello")	253	5	5	N	1	31	8
+LAST_VALUE(@last_a:=1,@last_b:="hello")
+hello
+select @last_b;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					@last_b	250	16777215	5	Y	0	31	8
+@last_b
+hello
+SELECT date(LAST_VALUE(@last_a:=1,@last_b:="2001-02-03"));
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					date(LAST_VALUE(@last_a:=1,@last_b:="2001-02-03"))	10	10	10	Y	128	0	63
+date(LAST_VALUE(@last_a:=1,@last_b:="2001-02-03"))
+2001-02-03
+select @last_b;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					@last_b	250	16777215	10	Y	0	31	8
+@last_b
+2001-02-03
+SELECT LAST_VALUE(@last_a:=1,@last_b:="2001-02-03",NULL);
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					LAST_VALUE(@last_a:=1,@last_b:="2001-02-03",NULL)	6	0	0	Y	32896	0	63
+LAST_VALUE(@last_a:=1,@last_b:="2001-02-03",NULL)
+NULL
+select @last_b;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def					@last_b	250	16777215	10	Y	0	31	8
+@last_b
+2001-02-03
+SELECT LAST_VALUE();
+ERROR 42000: 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 ')' at line 1

mysql-test/t/last_value.test

+#
+# Tests for the LAST_VALUE function
+#
+
+--disable_warnings
+drop table if exists t1;
+drop database if exists mysqltest;
+--enable_warnings
+
+# CREATE TABLE `queue` (
+#  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
+#  `priority` int(11) DEFAULT NULL,
+#  `state` int(11) DEFAULT NULL,
+#  `pid` int(10) unsigned DEFAULT NULL,
+#  `dat` varbinary(200) DEFAULT NULL,
+#  PRIMARY KEY (`id`)
+# )
+
+CREATE TABLE t1 (a INT, b INT, c INT, d INT);
+INSERT INTO t1 VALUES (1,3,0,NULL),(2,2,0,NULL),(3,4,0,NULL),(4,2,0,NULL);
+SELECT * FROM t1;
+UPDATE t1 SET c=LAST_VALUE(@last_a:=a,@last_b:=b,@last_c:=c,1), d=4211 WHERE c=0 ORDER BY b DESC LIMIT 1;
+SELECT @last_a, @last_b, @last_c;
+SELECT * FROM t1;
+DROP TABLE t1;
+
+#
+# Test with different types
+#
+--enable_metadata
+SELECT LAST_VALUE(@last_a:=1,@last_b:=1);
+select @last_b;
+SELECT LAST_VALUE(@last_a:=1,@last_b:=1.0);
+select @last_b;
+SELECT LAST_VALUE(@last_a:=1,@last_b:="hello");
+select @last_b;
+SELECT date(LAST_VALUE(@last_a:=1,@last_b:="2001-02-03"));
+select @last_b;
+SELECT LAST_VALUE(@last_a:=1,@last_b:="2001-02-03",NULL);
+select @last_b;
+--disable_metadata
+--error ER_PARSE_ERROR
+SELECT LAST_VALUE();

sql/derror.cc

@@ -177,8 +177,8 @@ bool read_texts(const char *file_name, const char *language,
                                O_RDONLY | O_SHARE | O_BINARY,
                                MYF(0))) < 0)
       goto err;
-    sql_print_error("An old style --language value with language specific part detected: %s", lc_messages_dir);
-    sql_print_error("Use --lc-messages-dir without language specific part instead.");
+    sql_print_warning("An old style --language or -lc-message-dir value with language specific part detected: %s", lc_messages_dir);
+    sql_print_warning("Use --lc-messages-dir without language specific part instead.");
   }
 
   funktpos=1;

sql/item_func.cc

@@ -6816,3 +6816,62 @@ longlong Item_func_uuid_short::val_int()
   mysql_mutex_unlock(&LOCK_short_uuid_generator);
   return (longlong) val;
 }
+
+
+/**
+  Last_value - return last argument.
+*/
+
+void Item_func_last_value::evaluate_sideeffects()
+{
+  DBUG_ASSERT(fixed == 1 && arg_count > 0);
+  for (uint i= 0; i < arg_count-1 ; i++)
+    args[i]->val_int();
+}
+
+String *Item_func_last_value::val_str(String *str)
+{
+  String *tmp;
+  evaluate_sideeffects();
+  tmp= last_value->val_str(str);
+  null_value= last_value->null_value;
+  return tmp;
+}
+
+longlong Item_func_last_value::val_int()
+{
+  longlong tmp;
+  evaluate_sideeffects();
+  tmp= last_value->val_int();
+  null_value= last_value->null_value;
+  return tmp;
+}
+
+double Item_func_last_value::val_real()
+{
+  double tmp;
+  evaluate_sideeffects();
+  tmp= last_value->val_real();
+  null_value= last_value->null_value;
+  return tmp;
+}
+
+my_decimal *Item_func_last_value::val_decimal(my_decimal *decimal_value)
+{
+  my_decimal *tmp;
+  evaluate_sideeffects();
+  tmp= last_value->val_decimal(decimal_value);
+  null_value= last_value->null_value;
+  return tmp;
+}
+
+
+void Item_func_last_value::fix_length_and_dec()
+{
+  last_value=          args[arg_count -1];
+  decimals=            last_value->decimals;
+  max_length=          last_value->max_length;
+  collation.set(last_value->collation.collation);
+  maybe_null=          last_value->maybe_null;
+  unsigned_flag=       last_value->unsigned_flag;
+}

sql/item_func.h

@@ -2003,6 +2003,27 @@ class Item_func_uuid_short :public Item_int_func
   }
 };
 
+
+class Item_func_last_value :public Item_func
+{
+protected:
+  Item *last_value;
+public:
+  Item_func_last_value(List<Item> &list) :Item_func(list) {}
+  double val_real();
+  longlong val_int();
+  String *val_str(String *);
+  my_decimal *val_decimal(my_decimal *);
+  void fix_length_and_dec();
+  enum Item_result result_type () const { return last_value->result_type(); }
+  const char *func_name() const { return "last_value"; }
+  table_map not_null_tables() const { return 0; }
+  enum_field_types field_type() const { return last_value->field_type(); }
+  bool const_item() const { return 0; }
+  void evaluate_sideeffects();
+};
+
+
 Item *get_system_var(THD *thd, enum_var_type var_type, LEX_STRING name,
                      LEX_STRING component);
 extern bool check_reserved_words(LEX_STRING *name);

sql/lex.h

@@ -302,6 +302,7 @@ static SYMBOL symbols[] = {
   { "KILL",		SYM(KILL_SYM)},
   { "LANGUAGE",         SYM(LANGUAGE_SYM)},
   { "LAST",		SYM(LAST_SYM)},
+  { "LAST_VALUE",	SYM(LAST_VALUE)},
   { "LEADING",		SYM(LEADING)},
   { "LEAVE",            SYM(LEAVE_SYM)},
   { "LEAVES",		SYM(LEAVES)},

sql/mysqld.cc

@@ -360,7 +360,7 @@ static DYNAMIC_ARRAY all_options;
 
 /* Global variables */
 
-bool opt_bin_log, opt_ignore_builtin_innodb= 0;
+bool opt_bin_log, opt_bin_log_used=0, opt_ignore_builtin_innodb= 0;
 my_bool opt_log, opt_slow_log, debug_assert_if_crashed_table= 0, opt_help= 0, opt_abort;
 ulonglong log_output_options;
 my_bool opt_userstat_running;
@@ -579,7 +579,7 @@ char mysql_real_data_home[FN_REFLEN],
      lc_messages_dir[FN_REFLEN], reg_ext[FN_EXTLEN],
      mysql_charsets_dir[FN_REFLEN],
      *opt_init_file, *opt_tc_log_file;
-char *lc_messages_dir_ptr, *log_error_file_ptr;
+char *lc_messages_dir_ptr= lc_messages_dir, *log_error_file_ptr;
 char mysql_unpacked_real_data_home[FN_REFLEN];
 int mysql_unpacked_real_data_home_len;
 uint mysql_real_data_home_len, mysql_data_home_len= 1;
@@ -4172,14 +4172,15 @@ static int init_server_components()
     unireg_abort(1);
 
   /* need to configure logging before initializing storage engines */
-  if (opt_log_slave_updates && !opt_bin_log)
+  if (!opt_bin_log_used)
   {
+    if (opt_log_slave_updates)
       sql_print_warning("You need to use --log-bin to make "
                         "--log-slave-updates work.");
-  }
-  if (!opt_bin_log && binlog_format_used)
+    if (binlog_format_used)
       sql_print_warning("You need to use --log-bin to make "
                         "--binlog-format work.");
+  }
 
   /* Check that we have not let the format to unspecified at this point */
   DBUG_ASSERT((uint)global_system_variables.binlog_format <=
@@ -6226,7 +6227,7 @@ struct my_option my_long_options[]=
   {"language", 'L',
    "Client error messages in given language. May be given as a full path. "
    "Deprecated. Use --lc-messages-dir instead.",
-   &lc_messages_dir_ptr, &lc_messages_dir_ptr, 0,
+   0, 0, 0,
    GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"lc-messages", 0,
    "Set the language used for the error messages.",
@@ -7218,7 +7219,7 @@ static int mysql_init_variables(void)
   myisam_test_invalid_symlink= test_if_data_home_dir;
 #endif
   opt_log= opt_slow_log= 0;
-  opt_bin_log= 0;
+  opt_bin_log= opt_bin_log_used= 0;
   opt_disable_networking= opt_skip_show_db=0;
   opt_skip_name_resolve= 0;
   opt_ignore_builtin_innodb= 0;
@@ -7270,7 +7271,6 @@ static int mysql_init_variables(void)
   mysql_home_ptr= mysql_home;
   pidfile_name_ptr= pidfile_name;
   log_error_file_ptr= log_error_file;
-  lc_messages_dir_ptr= lc_messages_dir;
   protocol_version= PROTOCOL_VERSION;
   what_to_log= ~ (1L << (uint) COM_TIME);
   refresh_version= 1L;	/* Increments on each reload */
@@ -7459,7 +7459,6 @@ mysqld_get_one_option(int optid,
     break;
   case 'L':
     strmake(lc_messages_dir, argument, sizeof(lc_messages_dir)-1);
-    lc_messages_dir_ptr= lc_messages_dir;
     break;
   case OPT_BINLOG_FORMAT:
     binlog_format_used= true;
@@ -7488,6 +7487,7 @@ mysqld_get_one_option(int optid,
     break;
   case (int) OPT_BIN_LOG:
     opt_bin_log= test(argument != disabled_my_option);
+    opt_bin_log_used= 1;
     break;
   case (int) OPT_LOG_BASENAME:
   {

sql/sql_yacc.yy

@@ -1064,6 +1064,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  KILL_SYM
 %token  LANGUAGE_SYM                  /* SQL-2003-R */
 %token  LAST_SYM                      /* SQL-2003-N */
+%token  LAST_VALUE
 %token  LE                            /* OPERATOR */
 %token  LEADING                       /* SQL-2003-R */
 %token  LEAVES
@@ -8890,6 +8891,12 @@ function_call_conflict:
             if ($$ == NULL)
               MYSQL_YYABORT;
           }
+        | LAST_VALUE '(' expr_list ')'
+          {
+            $$= new (YYTHD->mem_root) Item_func_last_value(* $3);
+            if ($$ == NULL)
+              MYSQL_YYABORT;
+          }
         | MICROSECOND_SYM '(' expr ')'
           {
             $$= new (YYTHD->mem_root) Item_func_microsecond($3);
@@ -13088,6 +13095,7 @@ keyword_sp:
         | ISSUER_SYM               {}
         | INSERT_METHOD            {}
         | KEY_BLOCK_SIZE           {}
+        | LAST_VALUE               {}
         | LAST_SYM                 {}
         | LEAVES                   {}
         | LESS_SYM                 {}