Function LogIndexScanDetails

pg_documentdb/src/explain/documentdb_explain.c:1035–1080

static void
LogIndexScanDetails(pgbson_writer *writer, Oid indexOid, ScanDirection indexorderdir,
					List *indexOrderBy, List *indexQuals, IndexScanDescData *scanDesc)
{
	const char *indexName = ExtensionExplainGetIndexName(indexOid);
	if (indexName)
	{
		PgbsonWriterAppendUtf8(writer, "indexName", -1, indexName);
	}

	PgbsonWriterAppendUtf8(writer, "direction", -1, ScanDirectionIsBackward(
							   indexorderdir) ? "Backward" : "Forward");

	if (indexOrderBy != NIL)
	{
		PgbsonWriterAppendBool(writer, "hasOrderBy", -1, true);
	}

	Oid indexAm = GetIndexAmOid(scanDesc, indexOid);
	if (IsBsonRegularIndexAm(indexAm))
	{
		/* A RUM style index for operators */
		Relation index_rel = index_open(indexOid, NoLock);
		if (IsCompositeOpClass(index_rel))
		{
			ExplainRawCompositeScanToWriter(index_rel, indexQuals, indexOrderBy,
											indexorderdir,
											writer);
		}
		index_close(index_rel, NoLock);
	}

	/* TODO: Vector search, geospatial indexes */
	pgbson_writer indexQualWriter;
	PgbsonWriterStartDocument(writer, "indexFilters", -1, &indexQualWriter);
	WriteQuals(&indexQualWriter, indexQuals);
	PgbsonWriterEndDocument(writer, &indexQualWriter);

	if (indexOrderBy != NIL)
	{
		pgbson_writer orderWriter;
		PgbsonWriterStartDocument(writer, "indexOrderBy", -1, &orderWriter);
		WriteIndexOrderBy(&orderWriter, indexOrderBy, indexAm, indexorderdir);
		PgbsonWriterEndDocument(writer, &orderWriter);
	}
}


static void