The issue can be traced to here: https://github.com/apache/calcite/blob/calcite-1.36.0/core/src/main/java/org/apache/calcite/prepare/CalcitePrepareImpl.java#L200-L203
Which is caused by using: https://github.com/apache/calcite/blob/calcite-1.36.0/core/src/main/java/org/apache/calcite/prepare/CalcitePrepareImpl.java#L375-L378 https://github.com/apache/calcite/blob/calcite-1.36.0/core/src/main/java/org/apache/calcite/prepare/CalcitePrepareImpl.java#L396-L399 From, Hugh Pearse
