Support grouping tables in viewpoints

[k1LoW]

No description provided.

[github-actions]

Code Metrics Report

	main (2753972)	#493 (69babfc)	+/-
Coverage	64.6%	62.5%	-2.1%
Code to Test Ratio	1:0.4	1:0.4	-0.0
Test Execution Time	4m6s	5m46s	+1m40s

Details

  |                     | main (2753972) | #493 (69babfc) |  +/-   |
  |---------------------|----------------|----------------|--------|
- | Coverage            |          64.6% |          62.5% |  -2.1% |
  |   Files             |             36 |             36 |      0 |
  |   Lines             |           3690 |           3769 |    +79 |
- |   Covered           |           2383 |           2355 |    -28 |
- | Code to Test Ratio  |          1:0.4 |          1:0.4 |   -0.0 |
  |   Code              |           9602 |           9769 |   +167 |
+ |   Test              |           3932 |           3958 |    +26 |
- | Test Execution Time |           4m6s |          5m46s | +1m40s |

Code coverage of files in pull request scope (58.4% → 58.5%)

Files	Coverage	+/-
config/config.go	56.8%	-2.8%
output/dot/dot.go	79.3%	+3.0%
output/gviz/gviz.go	15.8%	0.0%
output/md/md.go	81.6%	+0.9%
schema/filter.go	0.0%	0.0%
schema/json.go	85.7%	+1.0%
schema/schema.go	41.0%	0.0%

---

Reported by octocov