fix #120

  trimspace before check single line comment

ast/testdata/TestSplitStatement.golden

@@ -31,6 +31,8 @@ where col = 1
 --
 from tb
 where col = 1
+17 
+-- comment
 0 select * from test\Ghello
 1 select 'hello\Gworld', col from test\Ghello
 2 -- select * from test\Ghello

ast/token.go

@@ -925,16 +925,18 @@ func SplitStatement(buf []byte, delimiter []byte) (string, string, []byte) {
 		}
 
 		// new line end single line comment
-		if singleLineComment {
-			if b == '\r' || b == '\n' {
+		if b == '\r' || b == '\n' {
+			if singleLineComment {
 				sql = string(buf[:i])
-				if strings.HasPrefix(sql, "--") || strings.HasPrefix(sql, "#") {
+				if strings.HasPrefix(strings.TrimSpace(sql), "--") ||
+					strings.HasPrefix(strings.TrimSpace(sql), "#") {
 					// just comment, query start with '--', '#'
 					break
 				}
 				// comment in multi-line sql
 				continue
 			}
+			continue
 		}
 
 		// multi line comment

ast/token_test.go

@@ -127,6 +127,7 @@ func TestSplitStatement(t *testing.T) {
 		[]byte(`--`),
 		[]byte(`-- comment`),
 		[]byte(`# comment`),
+		// https://github.com/XiaoMi/soar/issues/116
 		[]byte(`select
 *
 -- comment
@@ -145,6 +146,12 @@ where col = 1`),
 --
 from tb
 where col = 1`),
+		// https://github.com/XiaoMi/soar/issues/120
+		[]byte(`
+-- comment
+select col from tb;
+select col from tb;
+`),
 	}
 	buf2s := [][]byte{
 		[]byte("select * from test\\Ghello"),