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fix(engine): Fix Walk() function implementation on various Expr implementations #16033

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@chaudum chaudum commented Jan 31, 2025

What this PR does / why we need it:

The Walk(f WalkFn) implementation expects to first visit the current node and then invoke Walk(f) on all its children if they are not nil.

This also fixes the checkIntervalLimit(syntax.SampleExpr, time.Duration) function, which did not visit the expression if it was a *ConcatSampleExpr.

Checklist

  • Reviewed the CONTRIBUTING.md guide (required)
  • Documentation added
  • Tests updated
  • Title matches the required conventional commits format, see here
    • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
  • Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
  • If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

@chaudum chaudum force-pushed the chaudum/fix-walk-function branch from 69acc87 to 2c10f31 Compare January 31, 2025 14:37
The `Walk(f WalkFn)` implementation expects to first visit the current
node and then invoke `Walk(f)` on all its children if they are not
`nil`.

This also fixes the `checkIntervalLimit(syntax.SampleExpr,
time.Duration)` function, which did not visit the expression if it was a
`*ConcatSampleExpr`.

Signed-off-by: Christian Haudum <[email protected]>
@chaudum chaudum force-pushed the chaudum/fix-walk-function branch from 869b80f to 8547515 Compare January 31, 2025 14:46
@chaudum chaudum marked this pull request as ready for review January 31, 2025 14:49
@chaudum chaudum requested a review from a team as a code owner January 31, 2025 14:49
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