Refactor/rename metrics related classes for NaN support#1829

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rdblue merged 7 commits intoapache:masterfrom

yyanyy:nan_orc_refactor

Dec 17, 2020

Commits on Dec 14, 2020

move generic testing outside of parquet folder
yyanyy
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Commits on Dec 16, 2020

fix timestamp type to use microseconds instead
yyanyy
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