sample is it's own relation in the join order optimizer

src/optimizer/join_order/relation_manager.cpp

@@ -89,6 +89,7 @@ static bool OperatorNeedsRelation(LogicalOperatorType op_type) {
 	case LogicalOperatorType::LOGICAL_DELIM_GET:
 	case LogicalOperatorType::LOGICAL_AGGREGATE_AND_GROUP_BY:
 	case LogicalOperatorType::LOGICAL_WINDOW:
+	case LogicalOperatorType::LOGICAL_SAMPLE:
 		return true;
 	default:
 		return false;

test/sql/optimizer/InFilter.test

@@ -0,0 +1,30 @@
+# name: test/sql/optimizer/InFilter.test
+# description: Test sampling of larger relations
+# group: [sample]
+
+#statement ok
+#PRAGMA enable_verification;
+
+statement ok
+CREATE TABLE t1 (s UUID, i VARCHAR);
+
+statement ok
+INSERT INTO t1 VALUES
+('619d9199-bc25-41d7-803e-1fa801b4b952'::UUID, NULL),
+('1ada8361-c20b-4e9f-9c8e-15689039cc75'::UUID, '91'),
+('f5a8a7d8-6bc5-4337-a296-d52078156051'::UUID, NULL);
+
+statement ok
+CREATE TABLE t2 (v VARCHAR);
+
+statement ok
+INSERT INTO t2 VALUES
+ ('Int',),
+ ('91',),
+ ('13',),
+ ('sst',);
+
+statement ok
+SELECT t1.s
+FROM t1
+LEFT JOIN t2 ON t1.i = t2.v;

test/sql/optimizer/tests_no_pushdown_under_samples.test

@@ -0,0 +1,18 @@
+# name: test/sql/optimizer/tests_no_pushdown_under_samples.test
+# group: [optimizer]
+
+statement ok
+CREATE OR REPLACE TABLE df AS (SELECT * AS i FROM range(10));
+
+statement ok
+CREATE OR REPLACE TABLE wtf AS (SELECT 1 AS i);
+
+query II
+explain FROM
+df, wtf
+SELECT
+df.i
+WHERE df.i > 8
+USING SAMPLE 1;
+----
+physical_plan	<REGEX>:.*FILTER.*RESERVOIR_SAMPLE.*