PostGIS, creating spatial index on box2d column failes

Question

I would like to store bounding boxes in a column of my table. Thus I wanted to use the box2d data-type for that column. However it seems like I can't create an index on that column. Here is my simplified SQL code:

 CREATE TABLE "rm"."test" (
 "id" serial PRIMARY KEY NOT NULL,
 "bbox" box2d
 );
 
 CREATE INDEX IF NOT EXISTS bbox_spatial_index ON rm.test USING gist (bbox);

Error message is:

ERROR: data type box2d has no default operator class for access method "gist" HINT: You must specify an operator class for the index or define a default operator class for the data type.

SQL state: 42704

Or am I wrong and I should store the bboxes in a different format in a "geometry" column? For example converting them to Polygones or Multipoints?

Versions:

PostGIS v3.3 (3.3 USE_GEOS=1 USE_PROJ=1 USE_STATS=1)

PostgreSQL 14.6, compiled by Visual C++ build 1914, 64-bit

Answer 1

As the error message says you can't build a gist index on a box2d. You can make them into polygons and use a gist index or look at different index types but I suspect that those won't really speed things up.