hsyuan opened a new pull request #1485: [CALCITE-2792] Stackoverflow while 
evaluating filter with large number of OR conditions
URL: https://github.com/apache/calcite/pull/1485
 
 
   SqlCall AND, OR require exactly 2 operands, instead of creating left-deep
   binary tree, which may cause stack overflow for large number of OR operands,
   we create balanced binary tree to reduce the recursive call depth.

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