HANA shows bad performance with large dataset join

Hello HANA Gurus,

we are starting to explore HANA. One scenario is around sales order user status involving SAP tables JEST, JSTO, TJ30T.

We build a calculated view that joins above tables and included a simple counter in the last join (before the aggregation node).

But we see performance far from good.

A  simple data preview of raw table SELECT TOP 10 * FROM …. takes about 10 min

A simple row count SELECT COUNT (*) takes about 12 min

A SELECT “STAT”, SUM(“COUNTER”) GROUP BY “STAT” takes about 20 min

I would have expected that the SELECT STAT, SUM group by statement runs like the wind as this is the scenario for HANA, not?

Okay the data volume of JEST is quite high 725 million. But the projection on it trims it down to 73 million.

Any idea how to approach this to find what is dragging performance down?

Or is this kind of performance normal?

Best regards,

Axel