add new lock syntax for mysql8

Signed-off-by: Patrick Carnahan <patrickcarnahan@github.com>
Signed-off-by: Arthur Schreiber <arthurschreiber@github.com>

go/vt/sqlparser/ast_funcs.go

@@ -1188,6 +1188,16 @@ func (lock Lock) ToString() string {
 		return NoLockStr
 	case ForUpdateLock:
 		return ForUpdateStr
+	case ForUpdateLockNoWait:
+		return ForUpdateNoWaitStr
+	case ForUpdateLockSkipLocked:
+		return ForUpdateSkipLockedStr
+	case ForShareLock:
+		return ForShareStr
+	case ForShareLockNoWait:
+		return ForShareNoWaitStr
+	case ForShareLockSkipLocked:
+		return ForShareSkipLockedStr
 	case ShareModeLock:
 		return ShareModeStr
 	default:

go/vt/sqlparser/constants.go

@@ -25,9 +25,14 @@ const (
 	SQLCalcFoundRowsStr = "sql_calc_found_rows "
 
 	// Select.Lock
-	NoLockStr    = ""
-	ForUpdateStr = " for update"
-	ShareModeStr = " lock in share mode"
+	NoLockStr              = ""
+	ForUpdateStr           = " for update"
+	ForUpdateNoWaitStr     = " for update nowait"
+	ForUpdateSkipLockedStr = " for update skip locked"
+	ForShareStr            = " for share"
+	ForShareNoWaitStr      = " for share nowait"
+	ForShareSkipLockedStr  = " for share skip locked"
+	ShareModeStr           = " lock in share mode"
 
 	// Select.Cache
 	SQLCacheStr   = "sql_cache "
@@ -466,6 +471,11 @@ const (
 	NoLock Lock = iota
 	ForUpdateLock
 	ShareModeLock
+	ForShareLock
+	ForShareLockNoWait
+	ForShareLockSkipLocked
+	ForUpdateLockNoWait
+	ForUpdateLockSkipLocked
 )
 
 // Constants for Enum Type - TrimType

go/vt/sqlparser/keywords.go

@@ -404,6 +404,7 @@ var keywords = []keyword{
 	{"localtimestamp", LOCALTIMESTAMP},
 	{"locate", LOCATE},
 	{"lock", LOCK},
+	{"locked", LOCKED},
 	{"logs", LOGS},
 	{"long", UNUSED},
 	{"longblob", LONGBLOB},
@@ -448,6 +449,7 @@ var keywords = []keyword{
 	{"none", NONE},
 	{"not", NOT},
 	{"now", NOW},
+	{"nowait", NOWAIT},
 	{"no_write_to_binlog", NO_WRITE_TO_BINLOG},
 	{"nth_value", NTH_VALUE},
 	{"ntile", NTILE},
@@ -563,6 +565,7 @@ var keywords = []keyword{
 	{"signal", UNUSED},
 	{"signed", SIGNED},
 	{"simple", SIMPLE},
+	{"skip", SKIP},
 	{"slow", SLOW},
 	{"smallint", SMALLINT},
 	{"snapshot", SNAPSHOT},

go/vt/sqlparser/parse_test.go

@@ -371,8 +371,18 @@ var (
 		input: "select /* distinct */ distinct 1 from t",
 	}, {
 		input: "select /* straight_join */ straight_join 1 from t",
+	}, {
+		input: "select /* for share */ 1 from t for share",
+	}, {
+		input: "select /* for share */ 1 from t for share nowait",
+	}, {
+		input: "select /* for share */ 1 from t for share skip locked",
 	}, {
 		input: "select /* for update */ 1 from t for update",
+	}, {
+		input: "select /* for update */ 1 from t for update nowait",
+	}, {
+		input: "select /* for update */ 1 from t for update skip locked",
 	}, {
 		input: "select /* lock in share mode */ 1 from t lock in share mode",
 	}, {