[#1544] Make temporal grouping result temporal

[timo95]

Fixes #1544

Description

• Allow custom setting of aggregation results (instead of only property values)
• Add flag to set time in temporal aggregation functions
• Add temporalGrouping with default time aggregation (min/max valid times) <- @ChrizZz110 @galpha any opinions?

Related Issue

1544

Motivation and Context

How Has This Been Tested?

Types of Changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [X] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [X] My code follows the code style of this project.
• [ ] I have updated the documentation accordingly (if necessary).
• [X] I have added tests to cover my changes.
• [X] All new and existing tests passed.
• [X] I ran a spell checker.

[ChrizZz110]

First of all - I'm happy that you took that issue, since I think this is really necessary. According to the realization I have to think about when I read your code ... First thin I noticed is the transaction time, which should not be changed. The transaction times of grouped elements should never changed. tx-from is set, when the super vertex/edge is created by gradoop. I know, this sounds unfamiliar, but this is the semantic of tx-times - they are immutable.

[timo95]

The transaction time isn't changed in temporalGrouping. I only added the possibility to change it with aggregations. I thought it would be good to have, since you can already read and aggregate it. I can remove this if you want.

[ChrizZz110]

Any special reason for changing the api of the aggregation class constructors? All systems that use these aggregate classes have to change the signature then

[timo95]

1. Keeping the constructor overload prettier (required parameters first, optional ones last)
2. Following the api of the non-temporal aggregation functions

[ChrizZz110]

Convinced.

[timo95]

Done.