How about adding single validator staking query

[yun-yeo]

Currently Cosmwasm only has all validators query here

cosmwasm/packages/std/src/traits.rs

Lines 240 to 244 in 71d953c

	pub fn query_validators(&self) -> StdResult<Vec<Validator>> {
	let request = StakingQuery::Validators {}.into();
	let res: ValidatorsResponse = self.query(&request)?;
	Ok(res.validators)
	}

In many cases, a contract does not want all validators info, but just want a single validator info or some validators info. so changing query_validators query to receive the optional validator_addresses will make query_validators cost efficient.

[ethanfrey]

Nice point. We have not used these queries heavily, so the APIs were best guesses.

I would rather add a new query type (that required one address and returns one value, not an array). But the idea is valid.

[yun-yeo]

Yea thanks for consideration. I think adding new type of query also good approach.

[ethanfrey]

What about including this in 0.14 milestone?

[webmaster128]

Yeah, sure. Sounds straight forward.

[webmaster128]

@YunSuk-Yeo, this is implemented in #879. Thanks for opening the issue.