Fix UI Query Distribution chart showing zero queries inaccurately

[Peiyingy]

Description

The Trino Gateway UI currently has a bug in the Query Distribution chart: query counts display correctly for even minutes, but always show zero for odd minutes due to the incorrect query count calculation.

The issue is caused by using Float.parseFloat when converting the minute value. Since float has limited precision, the last bit of the value was lost, results wrong minute buckets. This PR replaces Float.parseFloat with BigDecimal longvalue to ensure full precision and correct query counts for all minutes.

Testing Done

• mvn clean install
• Tested the new query distribution chart

Additional context and related issues

Release notes

(x) This is not user-visible or is docs only, and no release notes are required.
( ) Release notes are required, with the following suggested text:

* Fix UI Query Distribution chart showing zero queries inaccurately.

Summary by Sourcery

Bug Fixes:

• Replace Float.parseFloat with BigDecimal.longValue to avoid precision loss when computing minute buckets in the chart

[cla-bot]

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Replaces float-based parsing of minute buckets with BigDecimal to fix incorrect zero query counts in the Query Distribution chart by preserving full precision during conversion.

Class diagram for updated minute parsing in HaQueryHistoryManager

classDiagram
    class HaQueryHistoryManager {
        +List<DistributionResponse.LineChart> findDistribution(Long ts)
    }
    class DistributionResponse {
    }
    class LineChart {
    }
    HaQueryHistoryManager --> DistributionResponse : uses
    DistributionResponse --> LineChart : contains
    HaQueryHistoryManager : - minute parsing changed from Float.parseFloat to BigDecimal.longValue

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File-Level Changes

Change	Details	Files
Use BigDecimal for minute value parsing instead of Float.parseFloat to avoid precision loss	Replaced Float.parseFloat conversion with new BigDecimal(string).longValue() Adjusted minute assignment to use BigDecimal.longValue()	gateway-ha/src/main/java/io/trino/gateway/ha/router/HaQueryHistoryManager.java

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[maswin]

Verified that the fix works. Can we add a test case?

[maswin]

LGTM

[Chaho12]

@maswin Thx for verifying!
@Peiyingy I changed the comments in Release notes section if you don't mind.

[Chaho12]

LGTM 👍 Can you rebase, squash commits into one, follow commit message guideline?

• https://trino.io/development/process.html#pull-request-and-commit-guidelines