Merge pull request #326 from pingcap/shenli/dollar-in-identifier

parser: Support dollar in identifier

parser/parser_test.go

@@ -469,6 +469,9 @@ func (s *testParserSuite) TestParser0(c *C) {
 
 		// For quote identifier
 		{"select `a`, `a.b`, `a b` from t", true},
+
+		// For unquoted identifier
+		{"create table MergeContextTest$Simple (value integer not null, primary key (value))", true},
 	}
 
 	for _, t := range table {

parser/scanner.l

@@ -464,7 +464,7 @@ user		{u}{s}{e}{r}
 using		{u}{s}{i}{n}{g}
 
 idchar0		[a-zA-Z_]
-idchars		{idchar0}|[0-9]
+idchars		{idchar0}|[0-9$] // See: https://dev.mysql.com/doc/refman/5.7/en/identifiers.html
 ident		{idchar0}{idchars}*
 
 user_var	"@"{ident}