private String sqlColumnNamer(Field<ENTITY> field) {
        return columnNameMap.get(field.identifier());
    }
Default implementation of the {@link SqlStreamSupplier}-interface.

@author Emil Forslund
@since 3.0.1
runtime-parent/runtime-core/src/main/java/com/speedment/runtime/core/internal/component/sql/SqlStreamSupplierImpl.java