Spatial query takes a long time to execute

Dear SAP,

I've approx 9.7 million rows, geometry is stored as ST_Geometry and only has ST_Point types.

Data is stored in SRS_ID 4326.

When I query a very small area, thing are reasonably fast (< 0.5 sec).

However when I query a larger area, where approx more than 50% of the entire set of rows will be selected, it takes a long time, more than 75 seconds.

I run the query from SAP HANA Modeler (but same behaviour is from ADO.NET Data Provider).

select shape

from gpspoint

where shape.ST_Intersects(ST_GeomFromWKT('Polygon((150 -34, 150 -32, 152 -32, 152 -34, 150 -34))', 4326)) = 1;

Statement 'select shape from gpspoint where shape.ST_Intersects(ST_GeomFromWKT('Polygon((150 -34, 150 -32, 152 ...'

successfully executed in 1:15.091 minutes  (server processing time: 1:15.076 minutes)

Fetched 1000 row(s) in 40 ms 349 µs (server processing time: 6 ms 843 µs)

Result limited to 1000 row(s) due to value configured in the Preferences

When I add an extra restriction, it is quick.

select shape

from gpspoint

where shape.ST_Intersects(ST_GeomFromWKT('Polygon((150 -34, 150 -32, 152 -32, 152 -34, 150 -34))', 4326)) = 1

AND status = 'Unavailable';

Statement 'select shape from gpspoint where shape.ST_Intersects(ST_GeomFromWKT('Polygon((150 -34, 150 -32, 152 ...'

successfully executed in 5.009 seconds  (server processing time: 4.991 seconds)

Fetched 1000 row(s) in 39 ms 241 µs (server processing time: 7 ms 323 µs)

Result limited to 1000 row(s) due to value configured in the Preferences

And when I query all rows it is very fast as well.

select shape from gpspoint;

Statement 'select shape from gpspoint'

successfully executed in 96 ms 588 µs  (server processing time: 82 ms 271 µs)

Fetched 1000 row(s) in 41 ms 695 µs (server processing time: 9 ms 412 µs)

Result limited to 1000 row(s) due to value configured in the Preferences

Is this expected behaviour?

Any idea how we can improve things?

Regards,

Patrick