Fix bug #2105

lib/set_parser.cpp

@@ -36,7 +36,7 @@ std::map<std::string,std::vector<string>> SetParser::parse() {
 #define SPACES " *"
 //#define VAR_VALUE "((?:[\\w/\\d:\\+\\-]|,)+)"
 //#define VAR_VALUE "((?:CONCAT\\((?:(REPLACE|CONCAT)\\()+@@sql_mode,(?:(?:'|\\w|,| |\"|\\))+(?:\\)))|(?:[@\\w/\\d:\\+\\-]|,)+|(?:)))"
-#define VAR_VALUE "(((?:CONCAT\\()*(?:((?: )*REPLACE|CONCAT)\\()+(?: )*@@sql_mode,(?:(?:'|\\w|,| |\"|\\))+(?:\\))*)|(?:[@\\w/\\d:\\+\\-]|,)+|(?:)))"
+#define VAR_VALUE "(((?:CONCAT\\()*(?:((?: )*REPLACE|IFNULL|CONCAT)\\()+(?: )*(?:NULL|@@sql_mode),(?:(?:'|\\w|,| |\"|\\))+(?:\\))*)|(?:[@\\w/\\d:\\+\\-]|,)+|(?:)))"
 
   const string pattern="(?:" NAMES SPACES QUOTES NAME_VALUE QUOTES "(?: +COLLATE +" QUOTES NAME_VALUE QUOTES "|)" "|" SESSION VAR SPACES "(?:|:)=" SPACES QUOTES VAR_VALUE QUOTES ") *,? *";
   re2::RE2 re(pattern, *opt2);

test/set_parser_test/setparsertest.cpp

@@ -81,6 +81,8 @@ static Test sql_mode[] = {
   { "SET SQL_MODE   ='TRADITIONAL'", { Expected("sql_mode",  {"TRADITIONAL"}) } },
   { "SET SQL_MODE  = \"TRADITIONAL\"", { Expected("sql_mode",  {"TRADITIONAL"}) } },
   { "SET SQL_MODE  = TRADITIONAL", { Expected("sql_mode",  {"TRADITIONAL"}) } },
+  { "set sql_mode = IFNULL(NULL,\"STRICT_TRANS_TABLES\")", { Expected("sql_mode",  {"IFNULL(NULL,\"STRICT_TRANS_TABLES\")"}) } },
+  { "set sql_mode = IFNULL(NULL,'STRICT_TRANS_TABLES')", { Expected("sql_mode",  {"IFNULL(NULL,'STRICT_TRANS_TABLES')"}) } },
   { "SET @@SESSION.sql_mode = CONCAT(CONCAT(@@sql_mode, ', STRICT_ALL_TABLES'), ', NO_AUTO_VALUE_ON_ZERO')", { Expected("sql_mode",  {"CONCAT(CONCAT(@@sql_mode, ', STRICT_ALL_TABLES'), ', NO_AUTO_VALUE_ON_ZERO')"}) } },
   { "set session sql_mode = 'ONLY_FULL_GROUP_BY'" , { Expected("sql_mode",  {"ONLY_FULL_GROUP_BY"}) } },
   { "SET sql_mode = 'NO_ZERO_DATE,STRICT_ALL_TABLES,ONLY_FULL_GROUP_BY'" , { Expected("sql_mode",  {"NO_ZERO_DATE,STRICT_ALL_TABLES,ONLY_FULL_GROUP_BY"}) } },
@@ -138,6 +140,7 @@ TEST(TestParse, SET_NAMES) {
 
 static Test multiple[] = {
   { "SET time_zone = 'Europe/Paris', sql_mode = 'TRADITIONAL'", { Expected("time_zone",  {"Europe/Paris"}), Expected("sql_mode", {"TRADITIONAL"}) } },
+  { "SET time_zone = 'Europe/Paris', sql_mode = IFNULL(NULL,\"STRICT_TRANS_TABLES\")", { Expected("time_zone",  {"Europe/Paris"}), Expected("sql_mode", {"IFNULL(NULL,\"STRICT_TRANS_TABLES\")"}) } },
   { "SET sql_mode = 'TRADITIONAL', NAMES 'utf8 COLLATE 'unicode_ci'", { Expected("sql_mode",  {"TRADITIONAL"}), Expected("names", {"utf8", "unicode_ci"}) } },
   { "SET  @@SESSION.sql_mode = CONCAT(CONCAT(@@sql_mode, ',STRICT_ALL_TABLES'), ',NO_AUTO_VALUE_ON_ZERO'),  @@SESSION.sql_auto_is_null = 0, @@SESSION.wait_timeout = 2147483",
   { Expected("sql_mode",  {"CONCAT(CONCAT(@@sql_mode, ',STRICT_ALL_TABLES'), ',NO_AUTO_VALUE_ON_ZERO')"}), Expected("sql_auto_is_null", {"0"}),