Commits on Apr 15, 2022

1. Fix handling of EXISTS inside BIND …

   This patch fixes an issue with `BIND( EXISTS ... )` in SPARQL,
   for example:
   
   ```sparql
   SELECT * WHERE {
       BIND(
   	EXISTS {
   	    <http://example.com/a>
   	    <http://example.com/b>
   	    <http://example.com/c>
   	}
   	AS ?bound
       )
   }
   ```
   
   The graph pattern of `EXISTS` needs to be translated for it to operate
   correctly during evaluation, but this was not happening. This patch
   corrects that so that the graph pattern is translated as part of
   translating `BIND`.
   
   This patch also adds a bunch of tests for EXISTS to ensure there is no
   regression and that various EXISTS cases function correctly.
   
   Fixes RDFLib#1472

   

   aucampia committed Apr 15, 2022
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