Refactor/rename metrics related classes for NaN support#1829

Merged

rdblue merged 7 commits intoapache:masterfrom yyanyy:nan_orc_refactor

Dec 17, 2020

+140-48

Commits on Dec 14, 2020

move generic testing outside of parquet folder
yyanyy
committed

Commits on Dec 16, 2020

fix timestamp type to use microseconds instead
yyanyy
committed