Function WriteIndexKeyForGetIndexes

pg_documentdb/src/metadata/index.c:2445–2498

* Serializes the IndexKey to a GetIndexes friendly manner. * Returns any additional Text indexes that were captured from processing * the index keys. */

 * the index keys.
 */
static List *
WriteIndexKeyForGetIndexes(pgbson_writer *writer, pgbson *keyDocument)
{
	bson_iter_t iter;
	PgbsonInitIterator(keyDocument, &iter);

	bool writtenTextColumn = false;
	pgbson_writer nestedWriter;
	PgbsonWriterStartDocument(writer, "key", 3, &nestedWriter);

	List *fullTextColumns = NIL;

	while (bson_iter_next(&iter))
	{
		StringView keyView = bson_iter_key_string_view(&iter);
		const bson_value_t *value = bson_iter_value(&iter);

		/* We only care about text indexes here.*/
		if (IsTextIndex(value))
		{
			/*
			 * For text, we insert a well-known metadata here
			 * key: { _fts: 'text', _ftsx: 1 }
			 * The actual keys go in "weights as an option"
			 */
			if (!writtenTextColumn)
			{
				PgbsonWriterAppendUtf8(&nestedWriter, "_fts", 4, "text");
				PgbsonWriterAppendInt32(&nestedWriter, "_ftsx", 5, 1);
				writtenTextColumn = true;
			}

			if (strcmp(keyView.string, "_fts") != 0)
			{
				/* Store the columns for later (weights) */
				TextIndexWeights *weights = palloc0(sizeof(TextIndexWeights));
				weights->path = keyView.string;
				weights->weight = 1.0;
				fullTextColumns = lappend(fullTextColumns, (void *) weights);
			}
		}
		else
		{
			if (strcmp(keyView.string, "_ftsx") != 0)
			{
				PgbsonWriterAppendValue(&nestedWriter, keyView.string, keyView.length,
										value);
			}
		}
	}

	PgbsonWriterEndDocument(writer, &nestedWriter);
	return fullTextColumns;
}


/*