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The RexUtil.simplify method should handle literal comparison simplification. From an email on the calcitedev mailing list:
Calcite doesn't seem to optimize away the literal comparison literal case
with RexUtil.simplify. In my understanding any literal comparison literal
results in a simple TRUE/FALSE result.I'm not sure this is valid in the general case, but I put together a simple
example of doing this on the RexUtil simplifyCall.
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CALCITE1638 Simplify $x=$x to true
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Resolved in release 1.12.0 (20170324).