.dataset.metamorph.html#var-empty-column-names">empty-column-names</a> </li><li> <a href="tech.v3.dataset.metamorph.html#var-empty-dataset">empty-dataset</a> </li><li> <a href="tech.v3.dataset.metamorph.html#var-ensure-array-backed">ensure-array-backed</a> </li><li> <a href="tech.v3.dataset.metamorph.html#var-feature-ecount">feature-ecount</a> </li><li> <a href="tech.v3.dataset.metamorph.html#var-filter">filter</a> </li><li> <a href="tech.v3.dataset.metamorph.html#var-filter-column">filter-column</a> </li><