Merge pull request #34243 from MaterializeInc/fix-division-by-zero-processes

catalog: add NULLIF protection for s.processes division

Author: leedqin

src/catalog/src/builtin.rs

@@ -12355,10 +12355,10 @@ replica_metrics_history AS (
     m.occurred_at,
     m.replica_id,
     r.size,
-    (SUM(m.cpu_nano_cores::float8) / NULLIF(s.cpu_nano_cores, 0)) / s.processes AS cpu_percent,
-    (SUM(m.memory_bytes::float8) / NULLIF(s.memory_bytes, 0)) / s.processes AS memory_percent,
-    (SUM(m.disk_bytes::float8) / NULLIF(s.disk_bytes, 0)) / s.processes AS disk_percent,
-    (SUM(m.heap_bytes::float8) / NULLIF(m.heap_limit, 0)) / s.processes AS heap_percent,
+    (SUM(m.cpu_nano_cores::float8) / NULLIF(s.cpu_nano_cores, 0)) / NULLIF(s.processes, 0) AS cpu_percent,
+    (SUM(m.memory_bytes::float8) / NULLIF(s.memory_bytes, 0)) / NULLIF(s.processes, 0) AS memory_percent,
+    (SUM(m.disk_bytes::float8) / NULLIF(s.disk_bytes, 0)) / NULLIF(s.processes, 0) AS disk_percent,
+    (SUM(m.heap_bytes::float8) / NULLIF(m.heap_limit, 0)) / NULLIF(s.processes, 0) AS heap_percent,
     SUM(m.disk_bytes::float8) AS disk_bytes,
     SUM(m.memory_bytes::float8) AS memory_bytes,
     s.disk_bytes::numeric * s.processes AS total_disk_bytes,