question: singleton instance release method . concode_field_sep IODAProviderFactory baseFactory concode_elem_sep ODAProviderFactory instance concode_elem_sep IODAFilterExprProvider filterProvider concode_field_sep IFilterExprDefinition createFilterExprDefinition concode_elem_sep IFilterExprDefinition createFilterExprDefinition concode_elem_sep IODAProviderFactory getODAProvider concode_elem_sep IODAFilterExprProvider getFilterProvider concode_elem_sep ODAProvider createODAProvider concode_elem_sep boolean supportODAFilterPushDown concode_elem_sep ODAProviderFactory getInstance concode_elem_sep void initeTheFactory concode_elem_sep List<IFilterExprDefinition> getMappedFilterExprDefinitions concode_elem_sep boolean supportOdaExtensionFilters concode_elem_sep void initFilterExprFactory
target: void function ( ) { baseFactory = null ; instance = null ; }