Refactor usage of `Column::get_element_isvalid()`

h2oai / datatable

A Python package for manipulating 2-dimensional tabular data structures

https://datatable.readthedocs.io

Mozilla Public License 2.0

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Closed oleksiyskononenko closed 1 year ago

oleksiyskononenko commented 1 year ago

rename get_element_isvalid() to get_element_validity();
do not use it to check validity of multiple elements in the same column to slightly improve performance;
streamline dt.fillna() backend.