// regexp expression expects the target expression and pattern to be a string, if it's not, we add a cast function.
func (v *typeInferrer) handleRegexpExpr(x *ast.PatternRegexpExpr) {
x.SetType(types.NewFieldType(mysql.TypeLonglong))
x.Type.Charset = charset.CharsetBin
x.Type.Collate = charset.CollationBin
x.Expr = v.addCastToString(x.Expr)
x.Pattern = v.addCastToString(x.Pattern)
}
