discardGeometryColumnSql function
Builds the SQL for DiscardGeometryColumn, which removes a geometry
column's geometry_columns metadata registration (and its spatial index,
if any) without dropping the underlying table column.
Useful in onDowngrade/onUpgrade migration paths that need to undo
addGeometryColumnSql.
Implementation
String discardGeometryColumnSql(String table, String column) =>
"SELECT DiscardGeometryColumn('$table', '$column')";