[SPARK-40008][SQL][FOLLOWUP] Fix codegen of casting integrals to ANSI intervals

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala

@@ -1803,7 +1803,6 @@ case class Cast(
           $evPrim = $util.durationToMicros($util.microsToDuration($c), (byte)${it.endField});
         """
     case x: IntegralType =>
-      assert(it.startField == it.endField)
       val util = IntervalUtils.getClass.getCanonicalName.stripSuffix("$")
       if (x == LongType) {
         (c, evPrim, _) =>
@@ -1834,7 +1833,6 @@ case class Cast(
           $evPrim = $util.periodToMonths($util.monthsToPeriod($c), (byte)${it.endField});
         """
     case x: IntegralType =>
-      assert(it.startField == it.endField)
       val util = IntervalUtils.getClass.getCanonicalName.stripSuffix("$")
       if (x == LongType) {
         (c, evPrim, _) =>

sql/core/src/test/resources/sql-tests/inputs/cast.sql

@@ -120,9 +120,11 @@ select cast(interval '1000000' second as smallint);
 -- cast integrals to ANSI intervals
 select cast(1Y as interval year);
 select cast(-122S as interval year to month);
+select cast(ym as interval year to month) from values(-122S) as t(ym);
 select cast(1000 as interval month);
 select cast(-10L as interval second);
 select cast(100Y as interval hour to second);
+select cast(dt as interval hour to second) from values(100Y) as t(dt);
 select cast(-1000S as interval day to second);
 select cast(10 as interval day);
 

sql/core/src/test/resources/sql-tests/results/ansi/cast.sql.out

@@ -856,6 +856,14 @@ struct<CAST(-122 AS INTERVAL YEAR TO MONTH):interval year to month>
 -10-2
 
 
+-- !query
+select cast(ym as interval year to month) from values(-122S) as t(ym)
+-- !query schema
+struct<ym:interval year to month>
+-- !query output
+-10-2
+
+
 -- !query
 select cast(1000 as interval month)
 -- !query schema
@@ -880,6 +888,14 @@ struct<CAST(100 AS INTERVAL HOUR TO SECOND):interval hour to second>
 0 00:01:40.000000000
 
 
+-- !query
+select cast(dt as interval hour to second) from values(100Y) as t(dt)
+-- !query schema
+struct<dt:interval hour to second>
+-- !query output
+0 00:01:40.000000000
+
+
 -- !query
 select cast(-1000S as interval day to second)
 -- !query schema

sql/core/src/test/resources/sql-tests/results/cast.sql.out

@@ -684,6 +684,14 @@ struct<CAST(-122 AS INTERVAL YEAR TO MONTH):interval year to month>
 -10-2
 
 
+-- !query
+select cast(ym as interval year to month) from values(-122S) as t(ym)
+-- !query schema
+struct<ym:interval year to month>
+-- !query output
+-10-2
+
+
 -- !query
 select cast(1000 as interval month)
 -- !query schema
@@ -708,6 +716,14 @@ struct<CAST(100 AS INTERVAL HOUR TO SECOND):interval hour to second>
 0 00:01:40.000000000
 
 
+-- !query
+select cast(dt as interval hour to second) from values(100Y) as t(dt)
+-- !query schema
+struct<dt:interval hour to second>
+-- !query output
+0 00:01:40.000000000
+
+
 -- !query
 select cast(-1000S as interval day to second)
 -- !query schema