MDEV-16806 Add Type_handler::create_literal_item()

sql/item.cc

@@ -6951,14 +6951,18 @@ Item_string::make_string_literal_concat(THD *thd, const LEX_CSTRING *str)
 */
 Item *Item_string::make_odbc_literal(THD *thd, const LEX_CSTRING *typestr)
 {
-  enum_field_types type= odbc_temporal_literal_type(typestr);
+  Item_literal *res;
-  Item *res= type == MYSQL_TYPE_STRING ? this :
+  const Type_handler *h;
-             create_temporal_literal(thd, val_str(NULL), type, false);
+  if (collation.repertoire == MY_REPERTOIRE_ASCII &&
+      str_value.length() < MAX_DATE_STRING_REP_LENGTH * 4 &&
+      (h= Type_handler::odbc_literal_type_handler(typestr)) &&
+      (res= h->create_literal_item(thd, val_str(NULL), false)))
+    return res;
   /*
-    create_temporal_literal() returns NULL if failed to parse the string,
+    h->create_literal_item() returns NULL if failed to parse the string,
     or the string format did not match the type, e.g.:  {d'2001-01-01 10:10:10'}
   */
-  return res ? res : this;
+  return this;
 }
 
 

sql/item.h

@@ -4330,34 +4330,6 @@ public:
   String *check_well_formed_result(bool send_error)
   { return Item::check_well_formed_result(&str_value, send_error); }
 
-  enum_field_types odbc_temporal_literal_type(const LEX_CSTRING *type_str) const
-  {
-    /*
-      If string is a reasonably short pure ASCII string literal,
-      try to parse known ODBC style date, time or timestamp literals,
-      e.g:
-      SELECT {d'2001-01-01'};
-      SELECT {t'10:20:30'};
-      SELECT {ts'2001-01-01 10:20:30'};
-    */
-    if (collation.repertoire == MY_REPERTOIRE_ASCII &&
-        str_value.length() < MAX_DATE_STRING_REP_LENGTH * 4)
-    {
-      if (type_str->length == 1)
-      {
-        if (type_str->str[0] == 'd')  /* {d'2001-01-01'} */
-          return MYSQL_TYPE_DATE;
-        else if (type_str->str[0] == 't') /* {t'10:20:30'} */
-          return MYSQL_TYPE_TIME;
-      }
-      else if (type_str->length == 2) /* {ts'2001-01-01 10:20:30'} */
-      {
-        if (type_str->str[0] == 't' && type_str->str[1] == 's')
-          return MYSQL_TYPE_DATETIME;
-      }
-    }
-    return MYSQL_TYPE_STRING; // Not a temporal literal
-  }
   Item_basic_constant *make_string_literal_concat(THD *thd,
                                                   const LEX_CSTRING *);
   Item *make_odbc_literal(THD *thd, const LEX_CSTRING *typestr);

sql/item_create.cc

@@ -7432,84 +7432,6 @@ find_qualified_function_builder(THD *thd)
 }
 
 
-static bool
-have_important_literal_warnings(const MYSQL_TIME_STATUS *status)
-{
-  return (status->warnings & ~MYSQL_TIME_NOTE_TRUNCATED) != 0;
-}
-
-
-/**
-  Builder for datetime literals:
-    TIME'00:00:00', DATE'2001-01-01', TIMESTAMP'2001-01-01 00:00:00'.
-  @param thd          The current thread
-  @param str          Character literal
-  @param length       Length of str
-  @param type         Type of literal (TIME, DATE or DATETIME)
-  @param send_error   Whether to generate an error on failure
-*/
-
-Item *create_temporal_literal(THD *thd,
-                              const char *str, size_t length,
-                              CHARSET_INFO *cs,
-                              enum_field_types type,
-                              bool send_error)
-{
-  MYSQL_TIME_STATUS status;
-  MYSQL_TIME ltime;
-  Item *item= NULL;
-  sql_mode_t flags= sql_mode_for_dates(thd);
-
-  switch(type)
-  {
-  case MYSQL_TYPE_DATE:
-  case MYSQL_TYPE_NEWDATE:
-    if (!str_to_datetime(cs, str, length, &ltime, flags, &status) &&
-        ltime.time_type == MYSQL_TIMESTAMP_DATE && !status.warnings)
-      item= new (thd->mem_root) Item_date_literal(thd, &ltime);
-    break;
-  case MYSQL_TYPE_DATETIME:
-    if (!str_to_datetime(cs, str, length, &ltime, flags, &status) &&
-        ltime.time_type == MYSQL_TIMESTAMP_DATETIME &&
-        !have_important_literal_warnings(&status))
-      item= new (thd->mem_root) Item_datetime_literal(thd, &ltime,
-                                                      status.precision);
-    break;
-  case MYSQL_TYPE_TIME:
-    if (!str_to_time(cs, str, length, &ltime, 0, &status) &&
-        ltime.time_type == MYSQL_TIMESTAMP_TIME &&
-        !have_important_literal_warnings(&status))
-      item= new (thd->mem_root) Item_time_literal(thd, &ltime,
-                                                  status.precision);
-    break;
-  default:
-    DBUG_ASSERT(0);
-  }
-
-  if (likely(item))
-  {
-    if (status.warnings) // e.g. a note on nanosecond truncation
-    {
-      ErrConvString err(str, length, cs);
-      make_truncated_value_warning(thd,
-                                   Sql_condition::time_warn_level(status.warnings),
-                                   &err, ltime.time_type, 0);
-    }
-    return item;
-  }
-
-  if (send_error)
-  {
-    const char *typestr=
-      (type == MYSQL_TYPE_DATE) ? "DATE" :
-      (type == MYSQL_TYPE_TIME) ? "TIME" : "DATETIME";
-    ErrConvString err(str, length, thd->variables.character_set_client);
-    my_error(ER_WRONG_VALUE, MYF(0), typestr, err.ptr());
-  }
-  return NULL;
-}
-
-
 static List<Item> *create_func_dyncol_prepare(THD *thd,
                                               DYNCALL_CREATE_DEF **dfs,
                                               List<DYNCALL_CREATE_DEF> &list)

sql/item_create.h

@@ -191,21 +191,6 @@ protected:
 #endif
 
 
-Item *create_temporal_literal(THD *thd,
-                              const char *str, size_t length,
-                              CHARSET_INFO *cs,
-                              enum_field_types type,
-                              bool send_error);
-inline
-Item *create_temporal_literal(THD *thd, const String *str,
-                              enum_field_types type,
-                              bool send_error)
-{
-  return create_temporal_literal(thd,
-                                 str->ptr(), str->length(), str->charset(),
-                                 type, send_error);
-}
-
 struct Native_func_registry
 {
   LEX_CSTRING name;

sql/sql_type.cc

@@ -285,6 +285,32 @@ bool Type_std_attributes::count_string_length(const char *func_name,
 }
 
 
+/*
+  Find a handler by its ODBC literal data type.
+
+  @param type_str  - data type name, not necessarily 0-terminated
+  @retval          - a pointer to data type handler if type_str points
+                     to a known ODBC literal data type, or NULL otherwise
+*/
+const Type_handler *
+Type_handler::odbc_literal_type_handler(const LEX_CSTRING *type_str)
+{
+  if (type_str->length == 1)
+  {
+    if (type_str->str[0] == 'd')      // {d'2001-01-01'}
+      return &type_handler_newdate;
+    else if (type_str->str[0] == 't') // {t'10:20:30'}
+      return &type_handler_time2;
+  }
+  else if (type_str->length == 2)     // {ts'2001-01-01 10:20:30'}
+  {
+    if (type_str->str[0] == 't' && type_str->str[1] == 's')
+      return &type_handler_datetime2;
+  }
+  return NULL; // Not a known ODBC literal type
+}
+
+
 /**
   This method is used by:
   - Item_user_var_as_out_param::field_type()
@@ -6663,3 +6689,94 @@ int Type_handler_real_result::stored_field_cmp_to_item(THD *thd,
     return 1;
   return 0;
 }
+
+
+/***************************************************************************/
+
+
+static bool have_important_literal_warnings(const MYSQL_TIME_STATUS *status)
+{
+  return (status->warnings & ~MYSQL_TIME_NOTE_TRUNCATED) != 0;
+}
+
+
+static void literal_warn(THD *thd, const Item *item,
+                         const char *str, size_t length, CHARSET_INFO *cs,
+                         const MYSQL_TIME *ltime,
+                         const MYSQL_TIME_STATUS *st,
+                         const char *typestr, bool send_error)
+{
+  if (likely(item))
+  {
+    if (st->warnings) // e.g. a note on nanosecond truncation
+    {
+      ErrConvString err(str, length, cs);
+      make_truncated_value_warning(thd,
+                                   Sql_condition::time_warn_level(st->warnings),
+                                   &err, ltime->time_type, 0);
+    }
+  }
+  else if (send_error)
+  {
+    ErrConvString err(str, length, cs);
+    my_error(ER_WRONG_VALUE, MYF(0), typestr, err.ptr());
+  }
+}
+
+
+Item_literal *
+Type_handler_date_common::create_literal_item(THD *thd,
+                                              const char *str,
+                                              size_t length,
+                                              CHARSET_INFO *cs,
+                                              bool send_error) const
+{
+  MYSQL_TIME_STATUS st;
+  MYSQL_TIME ltime;
+  Item_literal *item= NULL;
+  sql_mode_t flags= sql_mode_for_dates(thd);
+  if (!str_to_datetime(cs, str, length, &ltime, flags, &st) &&
+      ltime.time_type == MYSQL_TIMESTAMP_DATE && !st.warnings)
+    item= new (thd->mem_root) Item_date_literal(thd, &ltime);
+  literal_warn(thd, item, str, length, cs, &ltime, &st, "DATE", send_error);
+  return item;
+}
+
+
+Item_literal *
+Type_handler_temporal_with_date::create_literal_item(THD *thd,
+                                                     const char *str,
+                                                     size_t length,
+                                                     CHARSET_INFO *cs,
+                                                     bool send_error) const
+{
+  MYSQL_TIME_STATUS st;
+  MYSQL_TIME ltime;
+  Item_literal *item= NULL;
+  sql_mode_t flags= sql_mode_for_dates(thd);
+  if (!str_to_datetime(cs, str, length, &ltime, flags, &st) &&
+      ltime.time_type == MYSQL_TIMESTAMP_DATETIME &&
+      !have_important_literal_warnings(&st))
+    item= new (thd->mem_root) Item_datetime_literal(thd, &ltime, st.precision);
+  literal_warn(thd, item, str, length, cs, &ltime, &st, "DATETIME", send_error);
+  return item;
+}
+
+
+Item_literal *
+Type_handler_time_common::create_literal_item(THD *thd,
+                                              const char *str,
+                                              size_t length,
+                                              CHARSET_INFO *cs,
+                                              bool send_error) const
+{
+  MYSQL_TIME_STATUS st;
+  MYSQL_TIME ltime;
+  Item_literal *item= NULL;
+  if (!str_to_time(cs, str, length, &ltime, 0, &st) &&
+      ltime.time_type == MYSQL_TIMESTAMP_TIME &&
+      !have_important_literal_warnings(&st))
+    item= new (thd->mem_root) Item_time_literal(thd, &ltime, st.precision);
+  literal_warn(thd, item, str, length, cs, &ltime, &st, "TIME", send_error);
+  return item;
+}

sql/sql_type.h

@@ -31,6 +31,7 @@ class Column_definition;
 class Column_definition_attributes;
 class Item;
 class Item_const;
+class Item_literal;
 class Item_param;
 class Item_cache;
 class Item_func_or_sum;
@@ -1077,6 +1078,7 @@ protected:
                                                     enum_field_types type)
                                                     const;
 public:
+  static const Type_handler *odbc_literal_type_handler(const LEX_CSTRING *str);
   static const Type_handler *blob_type_handler(uint max_octet_length);
   static const Type_handler *string_type_handler(uint max_octet_length);
   static const Type_handler *bit_and_int_mixture_handler(uint max_char_len);
@@ -1416,6 +1418,32 @@ public:
                                                Item *src,
                                                const Item *cmp) const= 0;
   virtual Item_cache *Item_get_cache(THD *thd, const Item *item) const= 0;
+  /**
+    A builder for literals with data type name prefix, e.g.:
+      TIME'00:00:00', DATE'2001-01-01', TIMESTAMP'2001-01-01 00:00:00'.
+    @param thd          The current thread
+    @param str          Character literal
+    @param length       Length of str
+    @param cs           Character set of the string
+    @param send_error   Whether to generate an error on failure
+
+    @retval             A pointer to a new Item on success
+                        NULL on error (wrong literal value, EOM)
+  */
+  virtual Item_literal *create_literal_item(THD *thd,
+                                            const char *str, size_t length,
+                                            CHARSET_INFO *cs,
+                                            bool send_error) const
+  {
+    DBUG_ASSERT(0);
+    return NULL;
+  }
+  Item_literal *create_literal_item(THD *thd, const String *str,
+                                    bool send_error) const
+  {
+    return create_literal_item(thd, str->ptr(), str->length(), str->charset(),
+                               send_error);
+  }
   virtual Item *create_typecast_item(THD *thd, Item *item,
                                      const Type_cast_attributes &attr) const
   {
@@ -2894,6 +2922,8 @@ public:
   {
     return MYSQL_TIMESTAMP_TIME;
   }
+  Item_literal *create_literal_item(THD *thd, const char *str, size_t length,
+                                    CHARSET_INFO *cs, bool send_error) const;
   Item *create_typecast_item(THD *thd, Item *item,
                              const Type_cast_attributes &attr) const;
   bool Item_eq_value(THD *thd, const Type_cmp_attributes *attr,
@@ -3008,6 +3038,8 @@ class Type_handler_temporal_with_date: public Type_handler_temporal_result
 {
 public:
   virtual ~Type_handler_temporal_with_date() {}
+  Item_literal *create_literal_item(THD *thd, const char *str, size_t length,
+                                    CHARSET_INFO *cs, bool send_error) const;
   bool Item_eq_value(THD *thd, const Type_cmp_attributes *attr,
                      Item *a, Item *b) const;
   int stored_field_cmp_to_item(THD *thd, Field *field, Item *item) const;
@@ -3037,6 +3069,8 @@ public:
   {
     return MYSQL_TIMESTAMP_DATE;
   }
+  Item_literal *create_literal_item(THD *thd, const char *str, size_t length,
+                                    CHARSET_INFO *cs, bool send_error) const;
   Item *create_typecast_item(THD *thd, Item *item,
                              const Type_cast_attributes &attr) const;
   bool Column_definition_fix_attributes(Column_definition *c) const;

sql/sql_yacc.yy

@@ -9259,8 +9259,9 @@ history_point:
           TIMESTAMP TEXT_STRING
           {
             Item *item;
-            if (!(item= create_temporal_literal(thd, $2.str, $2.length, YYCSCL,
+            if (!(item= type_handler_datetime.create_literal_item(thd,
-                                                MYSQL_TYPE_DATETIME, true)))
+                                                     $2.str, $2.length,
+                                                     YYCSCL, true)))
               MYSQL_YYABORT;
             $$= Vers_history_point(VERS_TIMESTAMP, item);
           }
@@ -14801,26 +14802,23 @@ NUM_literal:
 temporal_literal:
         DATE_SYM TEXT_STRING
           {
-            if (unlikely(!($$= create_temporal_literal(thd, $2.str, $2.length,
+            if (unlikely(!($$= type_handler_newdate.create_literal_item(thd,
-                                                       YYCSCL,
+                                                           $2.str, $2.length,
-                                                       MYSQL_TYPE_DATE,
+                                                           YYCSCL, true))))
-                                                       true))))
               MYSQL_YYABORT;
           }
         | TIME_SYM TEXT_STRING
           {
-            if (unlikely(!($$= create_temporal_literal(thd, $2.str, $2.length,
+            if (unlikely(!($$= type_handler_time2.create_literal_item(thd,
-                                                       YYCSCL,
+                                                         $2.str, $2.length,
-                                                       MYSQL_TYPE_TIME,
+                                                         YYCSCL, true))))
-                                                       true))))
               MYSQL_YYABORT;
           }
         | TIMESTAMP TEXT_STRING
           {
-            if (unlikely(!($$= create_temporal_literal(thd, $2.str, $2.length,
+            if (unlikely(!($$= type_handler_datetime.create_literal_item(thd,
-                                                       YYCSCL,
+                                                            $2.str, $2.length,
-                                                       MYSQL_TYPE_DATETIME,
+                                                            YYCSCL, true))))
-                                                       true))))
               MYSQL_YYABORT;
           }
         ;

sql/sql_yacc_ora.yy

@@ -9387,8 +9387,9 @@ history_point:
           TIMESTAMP TEXT_STRING
           {
             Item *item;
-            if (!(item= create_temporal_literal(thd, $2.str, $2.length, YYCSCL,
+            if (!(item= type_handler_datetime2.create_literal_item(thd,
-                                                MYSQL_TYPE_DATETIME, true)))
+                                                      $2.str, $2.length,
+                                                      YYCSCL, true)))
               MYSQL_YYABORT;
             $$= Vers_history_point(VERS_TIMESTAMP, item);
           }
@@ -15046,26 +15047,23 @@ NUM_literal:
 temporal_literal:
         DATE_SYM TEXT_STRING
           {
-            if (unlikely(!($$= create_temporal_literal(thd, $2.str, $2.length,
+            if (unlikely(!($$= type_handler_newdate.create_literal_item(thd,
-                                                       YYCSCL,
+                                                           $2.str, $2.length,
-                                                       MYSQL_TYPE_DATE,
+                                                           YYCSCL, true))))
-                                                       true))))
               MYSQL_YYABORT;
           }
         | TIME_SYM TEXT_STRING
           {
-            if (unlikely(!($$= create_temporal_literal(thd, $2.str, $2.length,
+            if (unlikely(!($$= type_handler_time2.create_literal_item(thd,
-                                                       YYCSCL,
+                                                         $2.str, $2.length,
-                                                       MYSQL_TYPE_TIME,
+                                                         YYCSCL, true))))
-                                                       true))))
               MYSQL_YYABORT;
           }
         | TIMESTAMP TEXT_STRING
           {
-            if (unlikely(!($$= create_temporal_literal(thd, $2.str, $2.length,
+            if (unlikely(!($$= type_handler_datetime2.create_literal_item(thd,
-                                                       YYCSCL,
+                                                             $2.str, $2.length,
-                                                       MYSQL_TYPE_DATETIME,
+                                                             YYCSCL, true))))
-                                                       true))))
               MYSQL_YYABORT;
           }
         ;