Matvey Arye 73f0d75882 Fix EXPLAIN for ConstraintAware and MergeAppend
This fixes a bug with an explain for ConstraintAware plans
when all chunks were excluded and a MergeAppend was used.
The problem was that the EXPLAIN output for MergeAppend nodes
expected at least one child to print the sorting column info.
When all chunks were excluded there are no children. This
PR removes all child execution states from the ConstraintAware
node when all chunks are excluded.
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