Cache DynamicDestinationsHelper.ConstantTimePartitioningClusteringDestination clustering & partitioning

[stankiewicz]

Fixes #36989 DynamicDestinationsHelper.ConstantTimePartitioningClusteringDestinations is parsing per element json configuration for partitioning and clustering which is expensive. Cache the outcome of evaluation so it's done once.

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Summary of Changes

Hello @stankiewicz, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant performance enhancement to the BigQuery I/O connector by optimizing how partitioning and clustering configurations are handled. Previously, these configurations were parsed from JSON for every element, leading to unnecessary overhead. The change implements a caching strategy within ConstantTimePartitioningClusteringDestinations to ensure that these configurations are evaluated and stored only once, thereby reducing computational load and improving overall efficiency.

Highlights

• Performance Optimization: Implements caching for BigQuery partitioning and clustering configurations within DynamicDestinationsHelper.ConstantTimePartitioningClusteringDestinations.
• Reduced JSON Parsing: Prevents redundant and expensive per-element JSON parsing of partitioning and clustering configurations.
• Lazy Initialization: Introduces a lazy, synchronized initialization mechanism to evaluate and cache these configurations only once.

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[stankiewicz]

/gemini review

[stankiewicz]

/gemini review

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Reminder, please take a look at this pr: @chamikaramj

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Assigning new set of reviewers because Pr has gone too long without review. If you would like to opt out of this review, comment assign to next reviewer:

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