hsyuan commented on issue #1156: [CALCITE-2973] Allow theta joins that have 
equi conditions to be exec…
URL: https://github.com/apache/calcite/pull/1156#issuecomment-524000289
 
 
   > @hsyuan , I'm not sure we can do that, since this change affects just 
EnumerableHashJoin (which will support now non-equi conditions); but there is 
still EnumerableMergeJoin (which only works with equi conditions) that remains 
unchanged.
   Also, I just noticed that an EnumerableHashJoin of type SEMI/ANTI supports 
only equi-join.
   
   @rubenada You are right, it seems we can't still remove it unless both of 
them support non-equi conditions.
   

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