Hi. I will add an example to https://gdal.org/user/ogr_sql_dialect.html#changing-the-type-of-the-fields showing users how to e.g., CAST LINESTRING Z to POINTS Z, e.g., to extract the points from: $ ogrinfo 0.lines.kml -q -sql 'SELECT "_ogr_geometry_" FROM "0"' Layer name: 0 OGRFeature(0):1 LINESTRING Z (-100.790056666679 36.3802233333333 1000,-100... Alas, there are no examples I can find of how to write it.
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