Invalid protocol sequence 'P' while in PortalSuspended state (Redshift)

[lewish]

We're encountering an issue with cursors on Redshift, which seems to manifest itself specifically when we only request a single row from the cursor. Requesting more than 1 seems to be working fine and as expected.

The full error:

{ error: Invalid protocol sequence 'P' while in PortalSuspended state.
    at Connection.parseE (.../node_modules/pg/lib/connection.js:604:11)
    at Connection.parseMessage (.../node_modules/pg/lib/connection.js:401:19)
    at TLSSocket.<anonymous> (.../node_modules/pg/lib/connection.js:121:22)
    at TLSSocket.emit (events.js:182:13)
    at addChunk (_stream_readable.js:283:12)
    at readableAddChunk (_stream_readable.js:264:11)
    at TLSSocket.Readable.push (_stream_readable.js:219:10)
    at TLSWrap.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)
  name: 'error',
  length: 143,
  severity: 'ERROR',
  code: 'XX000',
  detail: undefined,
  hint: undefined,
  position: undefined,
  internalPosition: undefined,
  internalQuery: undefined,
  where: undefined,
  schema: undefined,
  table: undefined,
  column: undefined,
  dataType: undefined,
  constraint: undefined,
  file: '/home/ec2-user/padb/src/sys/xen_execute.cpp',
  line: '8205',
  routine: 'pg_throw' }

We're not 100% convinced that just requesting always a minimum of 2 rows is necessarily a real fix for this, so would love to hear any thoughts if you have them! It's also somewhat flaky, it doesn't always happen, and happens for a mixture of different query types.