func IsColName(node ValExpr) bool {
	_, ok := node.(*ColName)
	return ok
}
IsColName returns true if the ValExpr is a *ColName.
package sqlparser
import (
	"fmt"
	"github.com/zhenjl/sqlparser/sqltypes"
)
func GetTableName(node SimpleTableExpr) string {
	if n, ok := node.(*TableName); ok && n.Qualifier == nil {
		return string(n.Name)
	}
	return ""
}
func GetColName(node Expr) string {
	if n, ok := node.(*ColName); ok {
		return string(n.Name)
	}
	return ""
}