Regression: select() selects empty nodes since version 4.45.2

[bguijt]

Describe the bug
A clear and concise description of what the bug is.

The select() expression, or the pipe (|) construct is passing empty nodes.

Version of yq: 4.45.2
Operating system: mac
Installed via: homebrew

Input Yaml
Given this document manifest.yaml:

---
kind: Cluster
metadata:
  name: database-a
---
kind: Cluster
metadata:
  name: database-b
---
kind: Secret
metadata:
  name: secrets-a
---
kind: ExternalSecret
metadata:
  name: secrets-b

Command

cat manifest.yaml | yq --no-doc 'select(.kind == "Cluster") | .kind + "/" + .metadata.name'

Actual behavior

Cluster/database-a
Cluster/database-b
Cluster/
Cluster/

Expected behavior

Cluster/database-a
Cluster/database-b

This bug seems to be introduced with version 4.45.2, before this I did not have this problem.

Thanks for looking into it!

[spirkaa]

Same problem.

yq eval '.[] | select(tag=="!!map") | (.before_script,.script,.after_script) | select(. != null ) | path | ".[\"" + join("\"].[\"") + "\"]"' "${filename}"

[AP-Hunt]

yq expression looking for script blocks in a GitHub Actions workflow.

Under 4.45.1

$  for path in $(yq '.jobs[] | .steps[] | select(.|has("run")) | .run | "."+(path | join("."))' .github/workflows/workflow.yml); do echo "${path}"; done;


$ echo $?
0

Under 4.45.2

$ for path in $(./yq '.jobs[] | .steps[] | select(.|has("run")) | .run | "."+(path | join("."))' .github/workflows/workflow.yml); do echo "${path}"; done;
 .

$ echo $?
0

[tbublik]

Same issue here since GH Actions updated ubuntu runner image to 20250504.1.0 which in turn includes yq 4.45.2, breaking our pipelines.

[planeiii-te]

Here's a simplified test case:

➜  catpants.sqQcXU ./yq-v4.45.1 'select(.nope) | key + " why though?"' <<< 'cat: pants'
➜  catpants.sqQcXU ./yq-v4.45.1 --version
yq (https://github.com/mikefarah/yq/) version v4.45.1
➜  catpants.sqQcXU ./yq-v4.45.2 'select(.nope) | key + " why though?"' <<< 'cat: pants'
 why though?
➜  catpants.sqQcXU ./yq-v4.45.2 --version
yq (https://github.com/mikefarah/yq/) version v4.45.2

@bguijt Would you add Regression to the title of this issue?

[mikefarah]

Sorry for the regression - please check the latest v4.45.3 build 😓