diff --git a/go/vt/sqlparser/ast.go b/go/vt/sqlparser/ast.go
index 235142c77b4..cc512c7096e 100644
--- a/go/vt/sqlparser/ast.go
+++ b/go/vt/sqlparser/ast.go
@@ -2674,7 +2674,7 @@ func (ct *ColumnType) merge(other ColumnType) error {
 
 	if other.KeyOpt != colKeyNone {
 		keyOptions := []ColumnKeyOption{ct.KeyOpt, other.KeyOpt}
-		sort.Slice(keyOptions, func(i, j int) bool {return keyOptions[i] < keyOptions[j]})
+		sort.Slice(keyOptions, func(i, j int) bool { return keyOptions[i] < keyOptions[j] })
 		if other.KeyOpt == ct.KeyOpt {
 			// MySQL will deduplicate key options when they are repeated.
 		} else if keyOptions[0] == colKeyPrimary && (keyOptions[1] == colKeyUnique || keyOptions[1] == colKeyUniqueKey) {
@@ -4789,7 +4789,7 @@ func (*ConvertExpr) iExpr()       {}
 func (*SubstrExpr) iExpr()        {}
 func (*TrimExpr) iExpr()          {}
 func (*ConvertUsingExpr) iExpr()  {}
-func (*CharExpr) iExpr()  {}
+func (*CharExpr) iExpr()          {}
 func (*MatchExpr) iExpr()         {}
 func (*GroupConcatExpr) iExpr()   {}
 func (*Default) iExpr()           {}
@@ -6895,6 +6895,15 @@ func (node *TableFuncExpr) UnmarshalJSON(b []byte) error {
 	return nil
 }
 
+func (node *TableFuncExpr) walkSubtree(visit Visit) error {
+	if node == nil {
+		return nil
+	}
+	return Walk(
+		visit,
+		node.Exprs)
+}
+
 // TableIdent is a case sensitive SQL identifier. It will be escaped with
 // backquotes if necessary.
 type TableIdent struct {
diff --git a/go/vt/sqlparser/sql_test.go b/go/vt/sqlparser/sql_test.go
index c5163b9153d..1437807e293 100644
--- a/go/vt/sqlparser/sql_test.go
+++ b/go/vt/sqlparser/sql_test.go
@@ -323,22 +323,39 @@ func TestDropIndex(t *testing.T) {
 	testIndex(t, tests)
 }
 
-// TestShowTablePrepared tests that Vitess can correctly walk all the SQLVal instances
-// in a parsed SHOW TABLES statement to identify the bound variables.
-func TestShowTablePrepared(t *testing.T) {
-	statement, err := Parse("SHOW TABLES FROM `mydb` WHERE `Tables_in_mydb` = ?")
-	require.NoError(t, err)
-	paramsCount := uint16(0)
-	_ = Walk(func(node SQLNode) (bool, error) {
-		switch node := node.(type) {
-		case *SQLVal:
-			if strings.HasPrefix(string(node.Val), ":v") {
-				paramsCount++
-			}
-		}
-		return true, nil
-	}, statement)
-	assert.Equal(t, uint16(1), paramsCount)
+// TestWalkPrepared tests that Vitess can correctly walk all the SQLVal instances
+// in a parsed statement to identify the bound variables.
+func TestWalkPrepared(t *testing.T) {
+	tests := []struct {
+		q        string
+		paramCnt int
+	}{
+		{
+			q:        "SHOW TABLES FROM `mydb` WHERE `Tables_in_mydb` = ?",
+			paramCnt: 1,
+		},
+		{
+			q:        "select * from table_function(?,?)",
+			paramCnt: 2,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(fmt.Sprintf("prepare param count: %s", tt.q), func(t *testing.T) {
+			statement, err := Parse(tt.q)
+			require.NoError(t, err)
+			paramsCount := uint16(0)
+			_ = Walk(func(node SQLNode) (bool, error) {
+				switch node := node.(type) {
+				case *SQLVal:
+					if strings.HasPrefix(string(node.Val), ":v") {
+						paramsCount++
+					}
+				}
+				return true, nil
+			}, statement)
+			assert.Equal(t, uint16(tt.paramCnt), paramsCount)
+		})
+	}
 }
 
 func TestShowIndex(t *testing.T) {