MDEV-19682 sql_mode="oracle" does not support sysdate

mysql-test/main/parser.result

@@ -109,7 +109,7 @@ ERROR 42000: You have an error in your SQL syntax; check the manual that corresp
 create table SUM (a int);
 drop table SUM;
 create table SYSDATE(a int);
-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 'SYSDATE(a int)' at line 1
+DROP TABLE SYSDATE;
 create table SYSDATE (a int);
 drop table SYSDATE;
 create table SYSTEM_USER(a int);
@@ -246,9 +246,9 @@ ERROR 42000: You have an error in your SQL syntax; check the manual that corresp
 create table SUM (a int);
 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 'SUM (a int)' at line 1
 create table SYSDATE(a int);
-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 'SYSDATE(a int)' at line 1
+DROP TABLE SYSDATE;
 create table SYSDATE (a int);
-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 'SYSDATE (a int)' at line 1
+DROP TABLE SYSDATE;
 create table SYSTEM_USER(a int);
 drop table SYSTEM_USER;
 create table SYSTEM_USER (a int);
@@ -2128,5 +2128,44 @@ Warnings:
 Note	1003	(select `test`.`t1`.`x` AS `x` from `test`.`t1` limit 1)
 drop table t1;
 #
+# MDEV-19682 sql_mode="oracle" does not support sysdate
+#
+SELECT sysdate LIKE '____-__-__ __:__:__';
+ERROR 42S22: Unknown column 'sysdate' in 'field list'
+SELECT sysdate = sysdate();
+ERROR 42S22: Unknown column 'sysdate' in 'field list'
+SELECT sysdate = sysdate(0);
+ERROR 42S22: Unknown column 'sysdate' in 'field list'
+CREATE DATABASE sysdate;
+DROP DATABASE sysdate;
+CREATE TABLE sysdate (a INT);
+DROP TABLE sysdate;
+CREATE TABLE t1 (sysdate INT);
+DROP TABLE t1;
+CREATE FUNCTION sysdate() RETURNS INT
+BEGIN
+RETURN 1;
+END;
+$$
+Warnings:
+Note	1585	This function 'sysdate' has the same name as a native function
+DROP FUNCTION sysdate;
+BEGIN NOT ATOMIC
+DECLARE sysdate INT DEFAULT 10;
+SELECT sysdate;
+END;
+$$
+sysdate
+10
+BEGIN NOT ATOMIC
+DECLARE a INT DEFAULT 0;
+sysdate:
+WHILE a DO
+SELECT 1;
+LEAVE sysdate;
+END WHILE ;
+END;
+$$
+#
 # End of 10.6 tests
 #

mysql-test/main/parser.test

@@ -158,8 +158,8 @@ create table SUM(a int);
 create table SUM (a int);
 drop table SUM;
 
---error ER_PARSE_ERROR
 create table SYSDATE(a int);
+DROP TABLE SYSDATE;
 create table SYSDATE (a int);
 drop table SYSDATE;
 
@@ -332,10 +332,10 @@ create table SUM(a int);
 --error ER_PARSE_ERROR
 create table SUM (a int);
 
---error ER_PARSE_ERROR
 create table SYSDATE(a int);
---error ER_PARSE_ERROR
+DROP TABLE SYSDATE;
 create table SYSDATE (a int);
+DROP TABLE SYSDATE;
 
 create table SYSTEM_USER(a int);
 drop table SYSTEM_USER;
@@ -1900,6 +1900,54 @@ insert into t1 values (1),(2);
 explain extended (SELECT x FROM t1 WINDOW w1 as () FOR UPDATE) LIMIT 1;
 explain extended (SELECT x FROM t1 FOR UPDATE) LIMIT 1;
 drop table t1;
+--echo #
+--echo # MDEV-19682 sql_mode="oracle" does not support sysdate
+--echo #
+
+--error ER_BAD_FIELD_ERROR
+SELECT sysdate LIKE '____-__-__ __:__:__';
+--error ER_BAD_FIELD_ERROR
+SELECT sysdate = sysdate();
+--error ER_BAD_FIELD_ERROR
+SELECT sysdate = sysdate(0);
+
+CREATE DATABASE sysdate;
+DROP DATABASE sysdate;
+
+CREATE TABLE sysdate (a INT);
+DROP TABLE sysdate;
+
+CREATE TABLE t1 (sysdate INT);
+DROP TABLE t1;
+
+DELIMITER $$;
+CREATE FUNCTION sysdate() RETURNS INT
+BEGIN
+  RETURN 1;
+END;
+$$
+DELIMITER ;$$
+DROP FUNCTION sysdate;
+
+DELIMITER $$;
+BEGIN NOT ATOMIC
+  DECLARE sysdate INT DEFAULT 10;
+  SELECT sysdate;
+END;
+$$
+DELIMITER ;$$
+
+DELIMITER $$;
+BEGIN NOT ATOMIC
+  DECLARE a INT DEFAULT 0;
+sysdate:
+  WHILE a DO
+    SELECT 1;
+    LEAVE sysdate;
+  END WHILE ;
+END;
+$$
+DELIMITER ;$$
 
 --echo #
 --echo # End of 10.6 tests

mysql-test/suite/compat/oracle/r/parser.result

@@ -806,3 +806,65 @@ ERROR HY000: Unknown data type: 'BEGIN'
 #
 # End of 10.5 tests
 #
+#
+# Start of 10.6 tests
+#
+#
+# MDEV-19682 sql_mode="oracle" does not support sysdate
+#
+SELECT sysdate LIKE '____-__-__ __:__:__';
+sysdate LIKE '____-__-__ __:__:__'
+1
+SELECT sysdate = sysdate();
+sysdate = sysdate()
+1
+SELECT sysdate = sysdate(0);
+sysdate = sysdate(0)
+1
+CREATE DATABASE sysdate;
+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 'sysdate' at line 1
+CREATE TABLE sysdate (a INT);
+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 'sysdate (a INT)' at line 1
+CREATE TABLE t1 (sysdate INT);
+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 'sysdate INT)' at line 1
+CREATE TABLE t1 (a sysdate);
+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 'sysdate)' at line 1
+CREATE FUNCTION sysdate RETURN INT AS
+BEGIN
+RETURN 1;
+END;
+$$
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'sysdate RETURN INT AS
+BEGIN
+RETURN 1;
+END' at line 1
+CREATE FUNCTION sysdate() RETURN INT AS
+BEGIN
+RETURN 1;
+END;
+$$
+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 'sysdate() RETURN INT AS
+BEGIN
+RETURN 1;
+END' at line 1
+DECLARE
+sysdate INT := 10;
+BEGIN
+NULL;
+END;
+$$
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'sysdate INT := 10;
+BEGIN
+NULL;
+END' at line 2
+BEGIN
+<<sysdate>>
+NULL;
+END;
+$$
+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 'sysdate>>
+NULL;
+END' at line 2
+#
+# End of 10.6 tests
+#

mysql-test/suite/compat/oracle/t/parser.test

@@ -653,3 +653,75 @@ SELECT CAST(1 AS BEGIN);
 --echo #
 --echo # End of 10.5 tests
 --echo #
+
+
+--echo #
+--echo # Start of 10.6 tests
+--echo #
+
+--echo #
+--echo # MDEV-19682 sql_mode="oracle" does not support sysdate
+--echo #
+
+# SYSDATE is not deterministic. Let's use LIKE and equality.
+# The main point here is only to check that SYSDATE
+# gets parsed without parentheses. The actial value is not important.
+SELECT sysdate LIKE '____-__-__ __:__:__';
+SELECT sysdate = sysdate();
+SELECT sysdate = sysdate(0);
+
+--error ER_PARSE_ERROR
+CREATE DATABASE sysdate;
+
+--error ER_PARSE_ERROR
+CREATE TABLE sysdate (a INT);
+
+--error ER_PARSE_ERROR
+CREATE TABLE t1 (sysdate INT);
+
+--error ER_PARSE_ERROR
+CREATE TABLE t1 (a sysdate);
+
+DELIMITER $$;
+--error ER_PARSE_ERROR
+CREATE FUNCTION sysdate RETURN INT AS
+BEGIN
+  RETURN 1;
+END;
+$$
+DELIMITER ;$$
+
+DELIMITER $$;
+--error ER_PARSE_ERROR
+CREATE FUNCTION sysdate() RETURN INT AS
+BEGIN
+  RETURN 1;
+END;
+$$
+DELIMITER ;$$
+
+
+DELIMITER $$;
+--error ER_PARSE_ERROR
+DECLARE
+  sysdate INT := 10;
+BEGIN
+  NULL;
+END;
+$$
+DELIMITER ;$$
+
+
+DELIMITER $$;
+--error ER_PARSE_ERROR
+BEGIN
+<<sysdate>>
+  NULL;
+END;
+$$
+DELIMITER ;$$
+
+
+--echo #
+--echo # End of 10.6 tests
+--echo #

sql/lex.h

@@ -648,6 +648,7 @@ static SYMBOL symbols[] = {
   { "SUSPEND",          SYM(SUSPEND_SYM)},
   { "SWAPS",      SYM(SWAPS_SYM)},
   { "SWITCHES",   SYM(SWITCHES_SYM)},
+  { "SYSDATE",		SYM(SYSDATE)},
   { "SYSTEM",     SYM(SYSTEM)},
   { "SYSTEM_TIME",      SYM(SYSTEM_TIME_SYM)},
   { "TABLE",		SYM(TABLE_SYM)},
@@ -787,7 +788,6 @@ static SYMBOL sql_functions[] = {
   { "SUBSTR",		SYM(SUBSTRING)},
   { "SUBSTRING",	SYM(SUBSTRING)},
   { "SUM",		SYM(SUM_SYM)},
-  { "SYSDATE",		SYM(SYSDATE)},
   { "SYSTEM_USER",      SYM(USER_SYM)},
   { "TRIM",		SYM(TRIM)},
   { "TRIM_ORACLE",	SYM(TRIM_ORACLE)},

sql/sql_lex.cc

@@ -9341,6 +9341,26 @@ Item *LEX::make_item_func_substr(THD *thd, Item *a, Item *b)
 }
 
 
+Item *LEX::make_item_func_sysdate(THD *thd, uint fsp)
+{
+  /*
+    Unlike other time-related functions, SYSDATE() is
+    replication-unsafe because it is not affected by the
+    TIMESTAMP variable.  It is unsafe even if
+    sysdate_is_now=1, because the slave may have
+    sysdate_is_now=0.
+  */
+  set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
+  Item *item= global_system_variables.sysdate_is_now == 0 ?
+              (Item *) new (thd->mem_root) Item_func_sysdate_local(thd, fsp) :
+              (Item *) new (thd->mem_root) Item_func_now_local(thd, fsp);
+  if (unlikely(item == NULL))
+    return NULL;
+  safe_to_cache_query=0;
+  return item;
+}
+
+
 Item *LEX::make_item_func_replace(THD *thd,
                                   Item *org,
                                   Item *find,

sql/sql_lex.h

@@ -4101,6 +4101,7 @@ struct LEX: public Query_tables_list
   Item *make_item_func_replace(THD *thd, Item *org, Item *find, Item *replace);
   Item *make_item_func_substr(THD *thd, Item *a, Item *b, Item *c);
   Item *make_item_func_substr(THD *thd, Item *a, Item *b);
+  Item *make_item_func_sysdate(THD *thd, uint fsp);
   Item *make_item_func_call_generic(THD *thd, Lex_ident_cli_st *db,
                                     Lex_ident_cli_st *name, List<Item> *args);
   Item *make_item_func_call_native_or_parse_error(THD *thd,

sql/sql_yacc.yy

@@ -10361,23 +10361,22 @@ function_call_nonkeyword:
             if (unlikely(!($$= Lex->make_item_func_substr(thd, $3, $5))))
               MYSQL_YYABORT;
           }
-        | SYSDATE opt_time_precision
+/* Start SQL_MODE_ORACLE_SPECIFIC
+        | SYSDATE
           {
-            /*
-              Unlike other time-related functions, SYSDATE() is
-              replication-unsafe because it is not affected by the
-              TIMESTAMP variable.  It is unsafe even if
-              sysdate_is_now=1, because the slave may have
-              sysdate_is_now=0.
-            */
-            Lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
-            if (global_system_variables.sysdate_is_now == 0)
-              $$= new (thd->mem_root) Item_func_sysdate_local(thd, $2);
-            else
-              $$= new (thd->mem_root) Item_func_now_local(thd, $2);
-            if (unlikely($$ == NULL))
+             if (unlikely(!($$= Lex->make_item_func_sysdate(thd, 0))))
+               MYSQL_YYABORT;
+          }
+End SQL_MODE_ORACLE_SPECIFIC */
+        | SYSDATE '(' ')'
+          {
+             if (unlikely(!($$= Lex->make_item_func_sysdate(thd, 0))))
+               MYSQL_YYABORT;
+          }
+        | SYSDATE '(' real_ulong_num ')'
+          {
+             if (unlikely(!($$= Lex->make_item_func_sysdate(thd, (uint) $3))))
                MYSQL_YYABORT;
-            Lex->safe_to_cache_query=0;
           }
         | TIMESTAMP_ADD '(' interval_time_stamp ',' expr ',' expr ')'
           {
@@ -16144,6 +16143,9 @@ keyword_sp_var_and_label:
         | SUSPEND_SYM
         | SWAPS_SYM
         | SWITCHES_SYM
+/* Start SQL_MODE_DEFAULT_SPECIFIC */
+        | SYSDATE
+/* End SQL_MODE_DEFAULT_SPECIFIC */
         | SYSTEM
         | SYSTEM_TIME_SYM
         | TABLE_NAME_SYM
@@ -16393,7 +16395,6 @@ reserved_keyword_udt_not_param_type:
         | STRAIGHT_JOIN
         | SUBSTRING
         | SUM_SYM
-        | SYSDATE
         | TABLE_REF_PRIORITY
         | TABLE_SYM
         | TERMINATED