fix(cubestore): don't add all measures to default preagg index

[KSDaemon]

This change improves the cube store preaggregation creation: the default index for a preaggregation now excludes all measures from the sorting keys

Check List

• Tests has been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

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[igorlukanin]

@KSDaemon I believe this has to be changed: https://cube.dev/docs/product/caching/using-pre-aggregations#using-indexes

Should this be considered a breaking change? Also, will upgrading to this version result in pre-aggregations being rebuilt, entirely or partially?

[KSDaemon]

@igorlukanin Actually No :) It's internal optimization, so indexes are still copies of all preagg data. The difference is that now, sorting keys for the index do not include measures (as it's mostly useless, no filtering is done by measures, potentially they may be useful for postagregation filtering (aka HAVING xxx). But that is another story.

Rgd existing indexes — there should be no changes. This technique will be applied only for new index creation.

[igorlukanin]

Docs still need to be updated wrt what is included in the default index, don't they?

[KSDaemon]

When you define a pre-aggregation without any explicit indexes, the default index is created. In this index, dimensions come first, time dimensions come second, and measures come last.

This is still true :)

[igorlukanin]

@KSDaemon Hopefully I did it correctly.