et.html#var-group-by-column-consumer">group-by-column-consumer</a> </li><li> <a href="tech.v3.dataset.html#var-has-column.3F">has-column?</a> </li><li> <a href="tech.v3.dataset.html#var-head">head</a> </li><li> <a href="tech.v3.dataset.html#var-induction">induction</a> </li><li> <a href="tech.v3.dataset.html#var-major-version">major-version</a> </li><li> <a href="tech.v3.dataset.html#var-mapseq-parser">mapseq-parser</a> </li><li> <a href="tech.v3.dataset.html#var-mapseq-reader">mapseq-reader</a> </li><li> <