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[hail] only convert row keys into Java objects in PCA#6666

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danking merged 2 commits intohail-is:masterfrom
iitalics:pca-copy-less
Jul 17, 2019
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[hail] only convert row keys into Java objects in PCA#6666
danking merged 2 commits intohail-is:masterfrom
iitalics:pca-copy-less

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@iitalics
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fixes #6236

instead of calling SafeRow to manifest the entire row and then pick out the keys, create UnsafeRows and then copy only the keys.

added RVD.toUnsafeRows

@tpoterba
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nice!

@tpoterba tpoterba self-assigned this Jul 17, 2019
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too bad I haven't added a PCA benchmark yet :(

@danking danking merged commit 009fd22 into hail-is:master Jul 17, 2019
@iitalics iitalics deleted the pca-copy-less branch July 17, 2019 15:13
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PCA converts a matrixtable to full java objects

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