YAQL methods can't handle an array of dict value at 'items' of 'with' parameter

[userlocalhost]

An execution of following workflow would fail with this error message when user specifes an array of dict value.

'YaqlEvaluationException: Unable to evaluate expression ''<% ctx(array_input).distinct() %>''. TypeError: unhashable type: ''BaseDict'

Metadata file (test_input.yaml)

---
name: test_input
description: Test action to check input parameter would be handled correctly
runner_type: orquesta
entry_point: workflows/test_input.yaml
enabled: true
parameters:
  array_input:
    type: array

Orquesta file (workflows/test_input.yam)

version: 1.0

input:
  - array_input

description: Intermediate workflow to check performance

tasks:
  task:
    action: core.echo
    with:
      items: <% ctx(array_input).distinct() %>
    input:
      message: <% item() %>

Execution result

Environment of st2

Note

This problem was happend at calling YAQL method 'distinct' to evaluate array of dict value which was specified in 'items' parameter.