sql: version gate casting to pg_lsn

Informs cockroachdb#105130

Release note: None

pkg/sql/logictest/testdata/logic_test/pg_lsn_mixed

@@ -1,10 +1,8 @@
 # LogicTest: local-mixed-22.2-23.1
 # TODO(otan): add tests for mixed 23.1-23.2.
 
-query T
-SELECT '1010F/AAAA'::pg_lsn
-----
-1010F/AAAA
+statement error must be finalized to use pg_lsn
+SELECT '1010F/AAAA'::text::pg_lsn
 
 statement error pg_lsn not supported until version 23.2
 CREATE TABLE pg_lsn_table(id pg_lsn, val pg_lsn)

pkg/sql/sem/eval/cast.go

@@ -583,6 +583,11 @@ func performCastWithoutPrecisionTruncation(
 		}
 
 	case types.PGLSNFamily:
+		if !evalCtx.Settings.Version.IsActive(ctx, clusterversion.V23_2) {
+			return nil, pgerror.Newf(pgcode.FeatureNotSupported,
+				"version %v must be finalized to use pg_lsn",
+				clusterversion.ByKey(clusterversion.V23_2))
+		}
 		switch d := d.(type) {
 		case *tree.DString:
 			return tree.ParseDPGLSN(string(*d))