[CP] fix bugs of float data type in mysql mode

src/sql/parser/sql_parser_mysql_mode.y

@@ -4536,6 +4536,10 @@ int_type_i opt_int_length_i opt_unsigned_i opt_zerofill_i
 }
 | float_type_i opt_float_precision opt_unsigned_i opt_zerofill_i
 {
+  if (T_FLOAT != $1[0] && NULL != $2 && -1 == $2->int16_values_[1]) {
+    yyerror(&@2, result, "double type not support double(M) syntax\n");
+    YYERROR;
+  }
   malloc_terminal_node($$, result->malloc_pool_, ($3[0] || $4[0]) ? $1[0] + (T_UFLOAT - T_FLOAT) : $1[0]);
   if (NULL != $2) {
     $$->int16_values_[0] = $2->int16_values_[0];
@@ -4759,6 +4763,14 @@ opt_float_precision:
   $$->int16_values_[0] = $2->value_;
   $$->int16_values_[1] = -1;
 }
+| '(' DECIMAL_VAL ')'
+{
+  malloc_terminal_node($$, result->malloc_pool_, T_LINK_NODE);
+  int err_no = 0;
+  $2->value_ = ob_strntoll($2->str_value_, $2->str_len_, 10, NULL, &err_no);
+  $$->int16_values_[0] = $2->value_;
+  $$->int16_values_[1] = -1;
+}
 | /*EMPTY*/
 {
   $$ = NULL;

src/sql/resolver/ob_resolver_utils.cpp

@@ -3807,10 +3807,17 @@ int ObResolverUtils::resolve_data_type(const ParseNode& type_node, const ObStrin
           ret = OB_ERR_TOO_BIG_SCALE;
           LOG_USER_ERROR(OB_ERR_TOO_BIG_SCALE, scale, ident_name.ptr(), OB_MAX_DOUBLE_FLOAT_SCALE);
           LOG_WARN("scale of double overflow", K(ret), K(scale), K(precision));
-        } else if (OB_UNLIKELY(precision > OB_MAX_DOUBLE_FLOAT_PRECISION)) {
+        } else if (OB_UNLIKELY(OB_DECIMAL_NOT_SPECIFIED == scale &&
+                               precision > OB_MAX_DOUBLE_FLOAT_PRECISION)) {
           ret = OB_ERR_COLUMN_SPEC;
           LOG_USER_ERROR(OB_ERR_COLUMN_SPEC, ident_name.length(), ident_name.ptr());
           LOG_WARN("precision of double overflow", K(ret), K(scale), K(precision));
+        } else if (OB_UNLIKELY(OB_DECIMAL_NOT_SPECIFIED != scale &&
+                   precision > OB_MAX_DOUBLE_FLOAT_DISPLAY_WIDTH)) {
+          ret = OB_ERR_TOO_BIG_DISPLAYWIDTH;
+          LOG_USER_ERROR(OB_ERR_TOO_BIG_DISPLAYWIDTH,
+                         ident_name.ptr(),
+                         OB_MAX_INTEGER_DISPLAY_WIDTH);
         } else if (OB_UNLIKELY(precision < scale)) {
           ret = OB_ERR_M_BIGGER_THAN_D;
           LOG_USER_ERROR(OB_ERR_M_BIGGER_THAN_D, to_cstring(ident_name));