Merge pull request #3263 from dolthub/angela/nested_query

Do not prune tables in semi-joins

Author: angelamayxie

enginetest/queries/script_queries.go

@@ -13371,6 +13371,20 @@ select * from t1 except (
 			},
 		},
 	},
+	{
+		// https://github.com/dolthub/dolt/issues/9951
+		Name: "Do not prune tables that are part of a semi-join",
+		SetUpScript: []string{
+			"create table t0(id int primary key, name longtext, description longtext, comment longtext, created_at timestamp(6), archived bool)",
+			"insert into t0 values (1, 'first', 'abc', 'def', '2025-10-14 10:00:00', b'0')",
+		},
+		Assertions: []ScriptTestAssertion{
+			{
+				Query:    "select * from (select id, name, description, archived from t0 as test0 where (id in (select id from t0))) as dummy_alias order by dummy_alias.name asc;",
+				Expected: []sql.Row{{1, "first", "abc", 0}},
+			},
+		},
+	},
 }
 
 var SpatialScriptTests = []ScriptTest{

sql/analyzer/symbol_resolution.go

@@ -89,7 +89,7 @@ func pruneTables(ctx *sql.Context, a *Analyzer, n sql.Node, s *plan.Scope, sel R
 		case *plan.ResolvedTable:
 			return pruneTableCols(n, parentCols, parentStars, unqualifiedStar)
 		case *plan.JoinNode:
-			if n.JoinType().IsPhysical() || n.JoinType().IsUsing() {
+			if n.JoinType().IsPhysical() || n.JoinType().IsUsing() || n.JoinType().IsSemi() {
 				return n, transform.SameTree, nil
 			}
 			// we cannot push projections past lateral joins as columns not in the projection,