memory database with binary column cannot be updated

[yuhangm000]

when I try to update a table contains a binary column, the result is
comparing uncomparable type []uint8
this issue is similar as issues/361, but when I read code, I found that update will check unique key, it will compare the new value and the old value, and that cause the error

// Update the given row from the table.
func (t *tableEditor) Update(ctx *sql.Context, oldRow sql.Row, newRow sql.Row) error {

	...

	// Throw a unique key error if any unique indexes are defined
	for _, cols := range t.uniqueIdxCols {
		if hasNullForAnyCols(newRow, cols) {
			continue
		}
		existing, found, err := t.ea.GetByCols(newRow, cols)  // this
		if err != nil {
			return err
		}

		if found {
			return sql.NewUniqueKeyErr(formatRow(newRow, cols), false, existing)
		}
	}

in GetByCols

func columnsMatch(colIndexes []int, row sql.Row, row2 sql.Row) bool {
	for _, i := range colIndexes {
		if row[i] != row2[i] {
			return false
		}
	}
	return true
}

Please help to confirm the problem~

[fulghum]

Hey @yuhangm000, thanks for reporting an issue. I tried to repro this with SQL commands directly against go-mysql-server, but I wasn't able to repro it that way. If you can share some simple repro code, we'll be happy to dig in and see what we can help figure out.

[yuhangm000]

@fulghum you can try this sql

CREATE TABLE `zt_test`(
  `id` BIGINT unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY,
  `instance_id` VARBINARY(20) NOT NULL,
  UNIQUE KEY `uniq_instance` (`instance_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci COMMENT='test';

type TestStruct struct {
	ID         uint64 `gorm:"column:id"`
	InstanceID string `gorm:"column:instance_id"`
}

and execute create before update

Hey @yuhangm000, thanks for reporting an issue. I tried to repro this with SQL commands directly against go-mysql-server, but I wasn't able to repro it that way. If you can share some simple repro code, we'll be happy to dig in and see what we can help figure out.