The `ConnectorError` `cached plan must not change result type` periodically appears (Postgres).

Bug description

I’ve got several test suites for the graphql API (built with ApolloServer & Prisma). The tests basically run some queries against the API endpoint with the apollo client. They are standalone (imitate user queries to the API). API uses a dev database (local Postgres docker container) and a locally running server.

An error occurs periodically, I can run 1 test file a few times and it passes, then this error occurs, after that again the tests pass.

console.error src/tests/utils/ErrorLog.ts:7
    Exception: {
      errors: [
        {
          message: '\n' +
            'Invalid `prisma.company.create()` invocation:\n' +
            '\n' +
            '\n' +
            '  Error occurred during query execution:\n' +
            'ConnectorError(ConnectorError { user_facing_error: None, kind: QueryError(Error { kind: Db, cause: Some(DbError { severity: "ERROR", parsed_severity: Some(Error), code: SqlState("0A000"), message: "cached plan must not change result type", detail: None, hint: None, position: None, where_: None, schema: None, table: None, column: None, datatype: None, constraint: None, file: Some("plancache.c"), line: Some(722), routine: Some("RevalidateCachedQuery") }) }) })',
          locations: [],
          path: [Array]
        }
      ],
      stacktrace: [
        'Error: ',
        'Invalid `prisma.company.create()` invocation:',
        '',
        '',
        '  Error occurred during query execution:',
        'ConnectorError(ConnectorError { user_facing_error: None, kind: QueryError(Error { kind: Db, cause: Some(DbError { severity: "ERROR", parsed_severity: Some(Error), code: SqlState("0A000"), message: "cached plan must not change result type", detail: None, hint: None, position: None, where_: None, schema: None, table: None, column: None, datatype: None, constraint: None, file: Some("plancache.c"), line: Some(722), routine: Some("RevalidateCachedQuery") }) }) })',
        '    at new CombinedError (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/stitching/errors.ts:90:5)',
        '    at Object.checkResultAndHandleErrors (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/stitching/errors.ts:111:11)',
        '    at CheckResultAndHandleErrors.transformResult (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/transforms/CheckResultAndHandleErrors.ts:15:12)',
        '    at /Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/transforms/transforms.ts:37:45',
        '    at Array.reduce (<anonymous>)',
        '    at applyResultTransforms (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/transforms/transforms.ts:35:21)',
        '    at /Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/stitching/delegateToSchema.ts:104:12',
        '    at step (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/dist/stitching/delegateToSchema.js:32:23)',
        '    at Object.next (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/dist/stitching/delegateToSchema.js:13:53)',
        '    at fulfilled (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/dist/stitching/delegateToSchema.js:4:58)'
      ]
    }

OR this error occurs if some tests pass in the suite

console.error src/tests/utils/ErrorLog.ts:7
    Exception: {
      errors: [
        {
          message: '\n' +
            'Invalid `prisma.salesDomain.create()` invocation:\n' +
            '\n' +
            '\n' +
            '  Error occurred during query execution:\n' +
            'ConnectorError(ConnectorError { user_facing_error: None, kind: QueryError(Error { kind: Db, cause: Some(DbError { severity: "ERROR", parsed_severity: Some(Error), code: SqlState("0A000"), message: "cached plan must not change result type", detail: None, hint: None, position: None, where_: None, schema: None, table: None, column: None, datatype: None, constraint: None, file: Some("plancache.c"), line: Some(722), routine: Some("RevalidateCachedQuery") }) }) })',
          locations: [],
          path: [Array]
        }
      ],
      stacktrace: [
        'Error: ',
        'Invalid `prisma.salesDomain.create()` invocation:',
        '',
        '',
        '  Error occurred during query execution:',
        'ConnectorError(ConnectorError { user_facing_error: None, kind: QueryError(Error { kind: Db, cause: Some(DbError { severity: "ERROR", parsed_severity: Some(Error), code: SqlState("0A000"), message: "cached plan must not change result type", detail: None, hint: None, position: None, where_: None, schema: None, table: None, column: None, datatype: None, constraint: None, file: Some("plancache.c"), line: Some(722), routine: Some("RevalidateCachedQuery") }) }) })',
        '    at new CombinedError (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/stitching/errors.ts:90:5)',
        '    at Object.checkResultAndHandleErrors (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/stitching/errors.ts:111:11)',
        '    at CheckResultAndHandleErrors.transformResult (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/transforms/CheckResultAndHandleErrors.ts:15:12)',
        '    at /Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/transforms/transforms.ts:37:45',
        '    at Array.reduce (<anonymous>)',
        '    at applyResultTransforms (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/transforms/transforms.ts:35:21)',
        '    at /Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/src/stitching/delegateToSchema.ts:104:12',
        '    at step (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/dist/stitching/delegateToSchema.js:32:23)',
        '    at Object.next (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/dist/stitching/delegateToSchema.js:13:53)',
        '    at fulfilled (/Users/jackiejo/main/smidyo/smidyo-monorepo/quoting-portal/api/node_modules/apollo-server/node_modules/graphql-tools/dist/stitching/delegateToSchema.js:4:58)'
      ]
    }

Also this periodically appears on postgres log in docker

dev-postgres_postgres_1 | 2021-06-15 14:09:35.072 UTC [35] ERROR: cached plan must not change result type

How to reproduce

Please refer to this repository: https://github.com/JackieJoo/prisma-error-sample

Expected behavior

No response

Prisma information

Environment & setup

• OS: Mac OS
• Database: PostgreSQL
• Node.js version: v14.15.1

Prisma Version

2.24.1

[MarcusHSmith]

Is there any news on this thread?

[pantharshit00]

I can reproduce this after running the reproduction twice.

It doesn’t seem to happen if I add &statement_cache_size=0 to the connection string so looks like a bug in the statement cache implementation. Add this to the connection string as a workaround for now.

You need to enable mode using DEBUG=* to see these error logs. I am marking this as confirmed bug.

Relevant stack traces:

  
 prisma:client:fetcher Error: Error occurred during query execution:
  prisma:client:fetcher ConnectorError(ConnectorError { user_facing_error: None, kind: QueryError(Error { kind: Db, cause: Some(DbError { severity: "ERROR", parsed_severity: Some(Error), code: SqlState("0A000"), message: "cached plan must not change result type", detail: None, hint: None, position: None, where_: None, schema: None, table: None, column: None, datatype: None, constraint: None, file: Some("plancache.c"), line: Some(722), routine: Some("RevalidateCachedQuery") }) }) })
  prisma:client:fetcher     at NodeEngine.graphQLToJSError (C:\Users\harshit\code\reproductions\prisma-error-sample\node_modules\@prisma\client\runtime\index.js:28016:14)
  prisma:client:fetcher     at NodeEngine.request (C:\Users\harshit\code\reproductions\prisma-error-sample\node_modules\@prisma\client\runtime\index.js:27912:24)
  prisma:client:fetcher     at processTicksAndRejections (internal/process/task_queues.js:95:5) +117ms

prisma:client:fetcher Error: An operation failed because it depends on one or more records that were required but not
found. No 'User' record(s) (needed to inline the relation on 'Post' record(s)) was found for a nested connect on one-to-many relation 'PostToUser'.
  prisma:client:fetcher     at NodeEngine.graphQLToJSError (C:\Users\harshit\code\reproductions\prisma-error-sample\node_modules\@prisma\client\runtime\index.js:28014:16)
  prisma:client:fetcher     at NodeEngine.request (C:\Users\harshit\code\reproductions\prisma-error-sample\node_modules\@prisma\client\runtime\index.js:27912:24)
  prisma:client:fetcher     at processTicksAndRejections (internal/process/task_queues.js:95:5)
  prisma:client:fetcher     at cb (C:\Users\harshit\code\reproductions\prisma-error-sample\node_modules\@prisma\client\runtime\index.js:33786:26) +17ms