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Which issue does this PR close?

Closes #3295.

Rationale for this change

Make ConfigOptions creation only as expensive as it needs to be.

What changes are included in this PR?

Pre-allocate HashMap.

Are there any user-facing changes?

None, except improved performance.

@github-actions github-actions bot added the core Core DataFusion crate label Aug 30, 2022
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Thanks @crepererum

@andygrove andygrove merged commit 7dedcb1 into apache:master Aug 30, 2022
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ursabot commented Aug 30, 2022

Benchmark runs are scheduled for baseline = 260923d and contender = 7dedcb1. 7dedcb1 is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java

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ConfigOptions creation is slow

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