potential optimization - bail out of executeSubSelectedArray calls

[phryneas]

This just came up in #11669 and I wanted to try it out.

One thing to consider strongly here is that this returns the original empty array, so I'll have to investigate if that could make it out of the cache where users could accidentally start manipulating it (and if we see this as a problem).

We could have a "weak empty array mapping cache" somewhere to prevent that, but at that point I'm not sure if this optimization does make any sense at all.

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[phryneas]

/release:pr

[github-actions]

size-limit report 📦

Path	Size
dist/apollo-client.min.cjs	38.4 KB (+0.02% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs"	46.23 KB (+0.01% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs" (production)	43.79 KB (+0.02% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js"	33.96 KB (+0.03% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js" (production)	31.87 KB (+0.02% 🔺)
import { ApolloProvider } from "dist/react/index.js"	1.23 KB (0%)
import { ApolloProvider } from "dist/react/index.js" (production)	1.22 KB (0%)
import { useQuery } from "dist/react/index.js"	5.26 KB (0%)
import { useQuery } from "dist/react/index.js" (production)	4.35 KB (0%)
import { useLazyQuery } from "dist/react/index.js"	5.5 KB (0%)
import { useLazyQuery } from "dist/react/index.js" (production)	4.58 KB (0%)
import { useMutation } from "dist/react/index.js"	3.51 KB (0%)
import { useMutation } from "dist/react/index.js" (production)	2.73 KB (0%)
import { useSubscription } from "dist/react/index.js"	3.19 KB (0%)
import { useSubscription } from "dist/react/index.js" (production)	2.38 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js"	5.41 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js" (production)	4.07 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js"	4.89 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js" (production)	3.55 KB (0%)
import { useLoadableQuery } from "dist/react/index.js"	5.02 KB (0%)
import { useLoadableQuery } from "dist/react/index.js" (production)	3.68 KB (0%)
import { useReadQuery } from "dist/react/index.js"	3.17 KB (0%)
import { useReadQuery } from "dist/react/index.js" (production)	3.11 KB (0%)
import { useFragment } from "dist/react/index.js"	2.27 KB (0%)
import { useFragment } from "dist/react/index.js" (production)	2.22 KB (0%)

[github-actions]

A new release has been made for this PR. You can install it with:

npm i @apollo/client@0.0.0-pr-11670-20240314104411

[benjamn]

This looks safe to me. The StoreReader often returns fieldValue to application code without making a defensive copy, but frozen (in development), so copying fieldValue in this case seems unusual/unnecessary.

[benjamn]

You could probably rearrange this so it only calls handleMissing and updates fieldValue if fieldValue.length > 0, but I leave that 🏌️ up to you.

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[jerelmiller]

Nice! 🎉