self.client = client

}

for keyPath: some KeyPath<T.TableColumns, C>,

policy: FieldMergePolicy<C.QueryValue.QueryOutput>

) -> C.QueryValue.QueryOutput where C.Root == T {

column: T.columns[keyPath: keyPath],

policy: policy

)

}

/// Resolves a field conflict by column, applying the given merge policy. Falls through to

/// the client or server value when only one side changed.

column: C,

policy: FieldMergePolicy<C.QueryValue.QueryOutput>

) -> C.QueryValue.QueryOutput where C.Root == T {

guard column.name != T.primaryKey.name else { return nil }

let column = column as! (any WritableTableColumnExpression<T, Value>)

let policy = policy(for: column.keyPath)

}

return open(column)

}