Function ParseDropIndexesArg

pg_documentdb/src/commands/drop_indexes.c:555–685

* ParseDropIndexesArg returns a DropIndexesArg object by parsing given * pgbson object that represents the "arg" document passed to * dbCommand/dropIndexes. */

 * dbCommand/dropIndexes.
 */
static DropIndexesArg
ParseDropIndexesArg(pgbson *arg, Datum *databaseNameDatum)
{
	DropIndexesArg dropIndexesArg = { 0 };

	/*
	 * Distinguish "index: []" from not specifying "index" field at all.
	 * While the former one is ok, the later one is not.
	 */
	bool gotIndexObject = false;

	bson_iter_t argIter;
	PgbsonInitIterator(arg, &argIter);
	while (bson_iter_next(&argIter))
	{
		/*
		 * we don't throw an error if we encounter with
		 * definition of a field more than once.
		 *
		 * TODO: We should also not throw an error if there is a syntax error
		 *       in the preceding definitions. That means, even if the first
		 *       definiton of "index" uses an integer, we should not throw an
		 *       error for the following, since later definition is valid:
		 *       {"index": 1, "index": "my_index_name"}
		 */

		const char *argKey = bson_iter_key(&argIter);

		/*
		 * The "deleteIndexes" command is deprecated but still accepted as an alias for "dropIndexes".
		 * The input and error handling are consistent with "dropIndexes", so no special handling is required.
		 */
		if (strcmp(argKey, "dropIndexes") == 0 ||
			strcmp(argKey, "deleteIndexes") == 0)
		{
			EnsureTopLevelFieldType("dropIndexes.dropIndexes", &argIter, BSON_TYPE_UTF8);

			const bson_value_t *dropIndexesVal = bson_iter_value(&argIter);
			dropIndexesArg.collectionName = pstrdup(dropIndexesVal->value.v_utf8.str);
		}
		else if (strcmp(argKey, "index") == 0)
		{
			gotIndexObject = true;
			dropIndexesArg.dropIndexMode = DROP_INDEX_MODE_INVALID;

			if (BSON_ITER_HOLDS_UTF8(&argIter))
			{
				const bson_value_t *indexVal = bson_iter_value(&argIter);
				dropIndexesArg.index.nameList =
					list_make1(pstrdup(indexVal->value.v_utf8.str));
				dropIndexesArg.dropIndexMode = DROP_INDEX_BY_NAME_LIST;
			}
			else if (BSON_ITER_HOLDS_DOCUMENT(&argIter))
			{
				dropIndexesArg.index.document = PgbsonInitFromIterDocumentValue(&argIter);
				dropIndexesArg.dropIndexMode = DROP_INDEX_BY_SPEC_DOCUMENT;
			}
			else if (BSON_ITER_HOLDS_ARRAY(&argIter))