/**
custom remove table method. but not removed in memory
*/
public static void removeAllTableDefinition(XSSFWorkbook workbook) {
	for (int i=0; i<workbook.getNumberOfSheets(); i++) {
		try {
			XSSFSheet sheet = workbook.getSheetAt(i);
			if (sheet.getTables().size() == 0) {
				continue;
			}
			sheet.getTables();
			log.info("removing tables of sheet:{}", sheet.getSheetName());
			List<String> relationIds = new ArrayList<String>();
			PackageRelationshipCollection relationshipCollection = sheet.getPackagePart().getRelationships();
			Iterator<PackageRelationship> relationIterator =relationshipCollection.iterator();

			while (relationIterator.hasNext()) {
				PackageRelationship relation = relationIterator.next();
				if (relation.getRelationshipType().matches(".+table$")) {//direct match table type
					log.info("	remove table part {}:{}", relation.getId(), relation.getSourceURI());
					relationIds.add(relation.getId());
				}
			}
			for (String id: relationIds) {
				sheet.getPackagePart().removeRelationship(id);
			}

			CTWorksheet ct_sheet = sheet.getCTWorksheet();
			CTTableParts ct_tableparts = ct_sheet.getTableParts();
			if (ct_tableparts != null) {
				for (int j = (int) (ct_tableparts.getCount()-1); j >= 0; j--) {
					ct_tableparts.removeTablePart(j);
				}
			}
		} catch (InvalidFormatException ex) {
			log.error(ex.getMessage(), ex);
		}
	}
}