Merge DAY() system function into opensource branch.

deps/oblib/src/lib/ob_name_def.h

@@ -523,6 +523,7 @@
 #define N_TO_TIMESTAMP_TZ "to_timestamp_tz"
 #define N_TO_DAYS "to_days"
 #define N_DAY_OF_MONTH "dayofmonth"
+#define N_DAY "day"
 #define N_DAY_OF_WEEK "dayofweek"
 #define N_DAY_OF_YEAR "dayofyear"
 #define N_HOUR "hour"

src/sql/engine/expr/ob_expr_day_of_func.cpp

@@ -36,6 +36,12 @@ int ObExprDayOfMonth::calc_dayofmonth(const ObExpr& expr, ObEvalCtx& ctx, ObDatu
   return ObExprTimeBase::calc(expr, ctx, expr_datum, DT_MDAY, true, true);
 }
 
+ObExprDay::ObExprDay(ObIAllocator &alloc)
+    : ObExprTimeBase(alloc, DT_MDAY, T_FUN_SYS_DAY, N_DAY){};
+
+ObExprDay::~ObExprDay()
+{}
+
 ObExprDayOfWeek::ObExprDayOfWeek(ObIAllocator& alloc)
     : ObExprTimeBase(alloc, DT_WDAY, T_FUN_SYS_DAY_OF_WEEK, N_DAY_OF_WEEK){};
 

src/sql/engine/expr/ob_expr_day_of_func.h

@@ -29,6 +29,15 @@ private:
   DISALLOW_COPY_AND_ASSIGN(ObExprDayOfMonth);
 };
 
+class ObExprDay: public ObExprTimeBase {
+public:
+  ObExprDay();
+  explicit ObExprDay(common::ObIAllocator &alloc);
+  virtual ~ObExprDay();
+private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprDay);
+};
+
 class ObExprDayOfWeek : public ObExprTimeBase {
 public:
   ObExprDayOfWeek();

src/sql/engine/expr/ob_expr_operator_factory.cpp

@@ -685,6 +685,7 @@ void ObExprOperatorFactory::register_expr_operators()
   REG_OP(ObExprDegrees);
   REG_OP(ObExprWeightString);
   REG_OP(ObExprBenchmark);
+  REG_OP(ObExprDay);
   // register oracle system function
   REG_OP_ORCL(ObExprSysConnectByPath);
   REG_OP_ORCL(ObExprTimestampNvl);

src/sql/parser/ob_item_type.h

@@ -440,6 +440,7 @@ typedef enum ObItemType {
   T_FUN_SYS_INETATON = 728,
   T_FUN_SYS_WEIGHT_STRING = 729,
   T_FUN_SYS_CRC32 = 730,
+  T_FUN_SYS_DAY = 731,
   ///< @note add new mysql only function type before this line
   T_MYSQL_ONLY_SYS_MAX_OP = 800,
 

src/sql/parser/sql_parser_mysql_mode.y

@@ -2200,6 +2200,13 @@ MOD '(' expr ',' expr ')'
   make_name_node($$, result->malloc_pool_, "date");
   malloc_non_terminal_node($$, result->malloc_pool_, T_FUN_SYS, 2, $$, params);
 }
+| DAY '(' expr ')'
+{
+  ParseNode *params = NULL;
+  malloc_non_terminal_node(params, result->malloc_pool_, T_EXPR_LIST, 1, $3);
+  make_name_node($$, result->malloc_pool_, "day");
+  malloc_non_terminal_node($$, result->malloc_pool_, T_FUN_SYS, 2, $$, params);
+}
 | YEAR '(' expr ')'
 {
   ParseNode *params = NULL;

src/sql/parser/type_name.c

@@ -383,6 +383,7 @@ const char* get_type_name(int type)
 	case T_FUN_SYS_INETATON : return "T_FUN_SYS_INETATON";
 	case T_FUN_SYS_WEIGHT_STRING : return "T_FUN_SYS_WEIGHT_STRING";
 	case T_FUN_SYS_CRC32 : return "T_FUN_SYS_CRC32";
+	case T_FUN_SYS_DAY : return "T_FUN_SYS_DAY";
 	case T_MYSQL_ONLY_SYS_MAX_OP : return "T_MYSQL_ONLY_SYS_MAX_OP";
 	case T_FUN_SYS_CONNECT_BY_PATH : return "T_FUN_SYS_CONNECT_BY_PATH";
 	case T_FUN_SYS_SYSTIMESTAMP : return "T_FUN_SYS_SYSTIMESTAMP";