public Call registerOutParameter(int position, int sqlType, CallableStatementMapper mapper) {
        getBinding().addPositional(position, new OutParamArgument(sqlType, mapper, null));
        return this;
    }
Register a positional output parameter.
@param position the parameter position (zero-based)
@param sqlType an SQL type constant as defined by {@link java.sql.Types} or by the JDBC vendor.
@param mapper a mapper which converts the {@link CallableStatement} to a desired output type.
@return self
core/src/main/java/org/jdbi/v3/core/statement/Call.java