Enable nested loop for gprestore connections

KnightMurloc · KnightMurloc · commit c02f0a7f1c02 · 2025-09-18T18:52:18.000+07:00
Statistics backups created in gpbackup versions starting from 1.30.5_arenadata16
have inefficient SQL for deleting existing statistics. For new backups, this
issue has been fixed in 18be0cbcb255c6840a23fvide085915e0d006069f5.
This patch fixes the issue for existing backups by enabling nested loop join.
This should lead to a more efficient plan with an index scan instead of a seq
scan.
diff --git a/restore/wrappers.go b/restore/wrappers.go
@@ -89,6 +89,7 @@ SET client_min_messages = error;
 SET standard_conforming_strings = on;
 SET default_with_oids = off;
 SET optimizer = off;
+SET enable_nestloop = on;
 `
 
 	setupQuery += "SET gp_ignore_error_table = on;\n"

Original file line number	Diff line number	Diff line change
`@@ -89,6 +89,7 @@ SET client_min_messages = error;`
`89`	`89`	`SET standard_conforming_strings = on;`
`90`	`90`	`SET default_with_oids = off;`
`91`	`91`	`SET optimizer = off;`
	`92`	`+SET enable_nestloop = on;`
`92`	`93`	`
`93`	`94`
`94`	`95`	`setupQuery += "SET gp_ignore_error_table = on;\n"`