Abacn commented on PR #35588:
URL: https://github.com/apache/beam/pull/35588#issuecomment-3074323401

   BeamSqlDslExistsTest failed due to query had been parsed differently. 
   
   Previously, not exists parsed to
   
   ```
   LogicalProject(c_custkey=[$0], c_acctbal=[$1], c_city=[$2])
     LogicalFilter(condition=[IS NULL($4)])
       LogicalJoin(condition=[=($0, $3)], joinType=[left])
   ```
   
   and invokes logical join. Now it becomes
   
   
   ```
   LogicalProject(c_custkey=[$0], c_acctbal=[$1], c_city=[$2])
     LogicalFilter(condition=[NOT(EXISTS({
   LogicalFilter(condition=[=($1, $cor0.c_custkey)])
     BeamIOSourceRel(table=[[beam, ORDERS]])
   }))], variablesSet=[[$cor0]])
       BeamIOSourceRel(table=[[beam, CUSTOMER]])
   ```
   
   condition becomes `[NOT(EXISTS({` and appears not implemented by Beam SQL


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