[Solved] “no such field as `OGR_GEOMETRY'” when changing Multipolygon to Polygon with altering geometry in shapefile

Gery Asks: “no such field as `OGR_GEOMETRY'” when changing Multipolygon to Polygon with altering geometry in shapefile
The attempt is to change from multipolygon to polygon (shapefile) using:

Code:
ogrinfo tmpem122.shp -sql "alter table tmpem122 alter column OGR_GEOMETRY type geometry(polygon, 4326) using st_geometryn(geometry,1)"

I get this error message:

ERROR 1: alter table tmpem122 alter column OGR_GEOMETRY type geometry(polygon, 4326) using st_geometryn(geometry,1) failed, no such field as `OGR_GEOMETRY’.

but according to ogrinfo -sql "select * from tmpem122" tmpem122.shp, the geometry column is OGR_GEOMETRY (or _ogr_geometry_):

Code:
Layer name: tmpem122
Geometry: Polygon
Feature Count: 17
Extent: ...
...
...
Geometry Column = _ogr_geometry_
gid: String (10.0)
...

What would it be wrong?

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