Calcite BOOLEAN returns precision of 1 but does not allow specifying a precision when creating an instance

This causes issues when creating extended columns of type BOOLEAN.

We create extended columns with the precision returned by RelDataType.getPrecision. We later use this precision in CalciteUtils.pDataTypeToRelDataType as RelDataTypeFactory.createSqlType with the precision specified as 1. This causes Calcite to throw an assertion.