Update EXPLAIN for logical and physical planner checks

Adjust update.slt to ensure both EXPLAIN UPDATE ... FROM
cases account for successful logical planning in addition
to the existing physical-planner rejection. Align Utf8View
cast with reports from sqllogictest in the filter for
better consistency.

Author: kosiew

datafusion/sqllogictest/test_files/update.slt

@@ -67,10 +67,19 @@ logical_plan
 physical_plan_error This feature is not implemented: Physical plan does not support logical expression ScalarSubquery(<subquery>)
 
 # set from other table
-# UPDATE ... FROM is currently unsupported
-# TODO fix https://github.com/apache/datafusion/issues/19950
-query error DataFusion error: This feature is not implemented: UPDATE ... FROM is not supported
+# UPDATE ... FROM now reaches logical planning, but the physical planner
+# still fails closed until joined update provider support lands.
+query TT
 explain update t1 set b = t2.b, c = t2.a, d = 1 from t2 where t1.a = t2.a and t1.b > 'foo' and t2.c > 1.0;
+----
+logical_plan
+01)Dml: op=[Update] table=[t1]
+02)--Projection: t1.a AS a, t2.b AS b, CAST(t2.a AS Float64) AS c, CAST(Int64(1) AS Int32) AS d
+03)----Filter: t1.a = t2.a AND t1.b > CAST(Utf8("foo") AS Utf8View) AND t2.c > Float64(1)
+04)------Cross Join:
+05)--------TableScan: t1
+06)--------TableScan: t2
+physical_plan_error This feature is not implemented: UPDATE ... FROM is not supported
 
 # test update from other table with actual data
 statement ok
@@ -90,10 +99,20 @@ statement error DataFusion error: This feature is not implemented: Multiple tabl
 explain update t1 set b = t2.b, c = t3.a, d = 1 from t2, t3 where t1.a = t2.a and t1.a = t3.a;
 
 # test table alias
-# UPDATE ... FROM is currently unsupported
-# TODO fix https://github.com/apache/datafusion/issues/19950
-statement error DataFusion error: This feature is not implemented: UPDATE ... FROM is not supported
+# UPDATE ... FROM with aliases also reaches logical planning, but execution
+# remains blocked in the physical planner for now.
+query TT
 explain update t1 as T set b = t2.b, c = t.a, d = 1 from t2 where t.a = t2.a and t.b > 'foo' and t2.c > 1.0;
+----
+logical_plan
+01)Dml: op=[Update] table=[t1]
+02)--Projection: t.a AS a, t2.b AS b, CAST(t.a AS Float64) AS c, CAST(Int64(1) AS Int32) AS d
+03)----Filter: t.a = t2.a AND t.b > CAST(Utf8("foo") AS Utf8View) AND t2.c > Float64(1)
+04)------Cross Join:
+05)--------SubqueryAlias: t
+06)----------TableScan: t1
+07)--------TableScan: t2
+physical_plan_error This feature is not implemented: UPDATE ... FROM is not supported
 
 # test update with table alias with actual data
 statement ok