Merge branch 'main' into fast-compare-tuple

internal/datastore/postgres/migrations/zz_migration.0016_add_tuned_gc_index.go

@@ -0,0 +1,34 @@
+package migrations
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/jackc/pgx/v5"
+)
+
+const createTunedGCIndex = `CREATE INDEX CONCURRENTLY 
+	IF NOT EXISTS ix_gc_index
+	ON relation_tuple (deleted_xid DESC)
+    WHERE deleted_xid < '9223372036854775807'::xid8;`
+
+const deleteSuboptimalGCIndex = `DROP INDEX CONCURRENTLY IF EXISTS ix_relation_tuple_by_deleted_xid`
+
+func init() {
+	if err := DatabaseMigrations.Register("add-tuned-gc-index", "add-gc-covering-index",
+		func(ctx context.Context, conn *pgx.Conn) error {
+			if _, err := conn.Exec(ctx, createTunedGCIndex); err != nil {
+				return fmt.Errorf("failed to create new tuned GC Index: %w", err)
+			}
+			if _, err := conn.Exec(ctx, deleteSuboptimalGCIndex); err != nil {
+				return fmt.Errorf("failed to remove old GC Index: %w", err)
+			}
+			if _, err := conn.Exec(ctx, "ANALYZE relation_tuple"); err != nil {
+				return fmt.Errorf("failed to update relation_tuple table statistics after new index: %w", err)
+			}
+			return nil
+		},
+		noTxMigration); err != nil {
+		panic("failed to register migration: " + err.Error())
+	}
+}