From aa21c9492e1ee09b55fb9fc3fd0f0c5d8fc2df3a Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@victoriametrics.com>
Date: Mon, 13 May 2024 22:30:03 +0200
Subject: [PATCH] wip

---
 lib/logstorage/block_result.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/logstorage/block_result.go b/lib/logstorage/block_result.go
index b5ac62dfb..e80a3516b 100644
--- a/lib/logstorage/block_result.go
+++ b/lib/logstorage/block_result.go
@@ -261,7 +261,14 @@ func (br *blockResult) mustInit(bs *blockSearch, bm *bitmap) {
 	}
 
 	// Initialize timestamps, since they are required for all the further work with br.
+	if !slices.Contains(bs.bsw.so.neededColumnNames, "_time") || slices.Contains(bs.bsw.so.unneededColumnNames, "_time") {
+		// The fastest path - _time column wasn't requested, so it is enough to initialize br.timestamps with zeroes.
+		rowsLen := bm.onesCount()
+		br.timestamps = fastnum.AppendInt64Zeros(br.timestamps[:0], rowsLen)
+		return
+	}
 
+	// Slow path - the _time column is requested, so we need to initialize br.timestamps with real timestamps.
 	srcTimestamps := bs.getTimestamps()
 	if bm.areAllBitsSet() {
 		// Fast path - all the rows in the block are selected, so copy all the timestamps without any filtering.