[SPARK-29761][SQL] do not output leading 'interval' in CalendarInterval.toString

common/unsafe/src/main/java/org/apache/spark/unsafe/types/CalendarInterval.java

@@ -84,7 +84,7 @@ public int hashCode() {
 
   @Override
   public String toString() {
-    StringBuilder sb = new StringBuilder("interval");
+    StringBuilder sb = new StringBuilder();
 
     if (months != 0) {
       appendUnit(sb, months / 12, "year");
@@ -101,18 +101,19 @@ public String toString() {
       rest %= MICROS_PER_MINUTE;
       if (rest != 0) {
         String s = BigDecimal.valueOf(rest, 6).stripTrailingZeros().toPlainString();
-        sb.append(' ').append(s).append(" seconds");
+        sb.append(s).append(" seconds ");
       }
     } else if (months == 0 && days == 0) {
-      sb.append(" 0 microseconds");
+      sb.append("0 microseconds ");
     }
 
+    sb.setLength(sb.length() - 1);
     return sb.toString();
   }
 
   private void appendUnit(StringBuilder sb, long value, String unit) {
     if (value != 0) {
-      sb.append(' ').append(value).append(' ').append(unit).append('s');
+      sb.append(value).append(' ').append(unit).append('s').append(' ');
     }
   }
 

common/unsafe/src/test/java/org/apache/spark/unsafe/types/CalendarIntervalSuite.java

@@ -51,28 +51,28 @@ public void toStringTest() {
     CalendarInterval i;
 
     i = new CalendarInterval(0, 0, 0);
-    assertEquals("interval 0 microseconds", i.toString());
+    assertEquals("0 microseconds", i.toString());
 
     i = new CalendarInterval(34, 0, 0);
-    assertEquals("interval 2 years 10 months", i.toString());
+    assertEquals("2 years 10 months", i.toString());
 
     i = new CalendarInterval(-34, 0, 0);
-    assertEquals("interval -2 years -10 months", i.toString());
+    assertEquals("-2 years -10 months", i.toString());
 
     i = new CalendarInterval(0, 31, 0);
-    assertEquals("interval 31 days", i.toString());
+    assertEquals("31 days", i.toString());
 
     i = new CalendarInterval(0, -31, 0);
-    assertEquals("interval -31 days", i.toString());
+    assertEquals("-31 days", i.toString());
 
     i = new CalendarInterval(0, 0, 3 * MICROS_PER_HOUR + 13 * MICROS_PER_MINUTE + 123);
-    assertEquals("interval 3 hours 13 minutes 0.000123 seconds", i.toString());
+    assertEquals("3 hours 13 minutes 0.000123 seconds", i.toString());
 
     i = new CalendarInterval(0, 0, -3 * MICROS_PER_HOUR - 13 * MICROS_PER_MINUTE - 123);
-    assertEquals("interval -3 hours -13 minutes -0.000123 seconds", i.toString());
+    assertEquals("-3 hours -13 minutes -0.000123 seconds", i.toString());
 
     i = new CalendarInterval(34, 31, 3 * MICROS_PER_HOUR + 13 * MICROS_PER_MINUTE + 123);
-    assertEquals("interval 2 years 10 months 31 days 3 hours 13 minutes 0.000123 seconds",
+    assertEquals("2 years 10 months 31 days 3 hours 13 minutes 0.000123 seconds",
       i.toString());
   }
 

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Sum.scala

@@ -34,7 +34,7 @@ import org.apache.spark.sql.types._
       > SELECT _FUNC_(col) FROM VALUES (NULL), (NULL) AS tab(col);
        NULL
       > SELECT _FUNC_(cast(col as interval)) FROM VALUES ('1 seconds'), ('2 seconds'), (null) tab(col);
-       interval 3 seconds
+       3 seconds
   """,
   since = "1.0.0")
 // scalastyle:on line.size.limit

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CastSuite.scala

@@ -669,7 +669,7 @@ abstract class CastSuiteBase extends SparkFunSuite with ExpressionEvalHelper {
     checkEvaluation(Cast(Literal.create(
       new CalendarInterval(15, 9, -3 * CalendarInterval.MICROS_PER_HOUR), CalendarIntervalType),
       StringType),
-      "interval 1 years 3 months 9 days -3 hours")
+      "1 years 3 months 9 days -3 hours")
     checkEvaluation(Cast(Literal("INTERVAL 1 Second 1 microsecond"), CalendarIntervalType),
       new CalendarInterval(0, 0, 1000001))
     checkEvaluation(Cast(Literal("1 MONTH 1 Microsecond"), CalendarIntervalType),

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSQLBuilderSuite.scala

@@ -169,12 +169,12 @@ class ExpressionSQLBuilderSuite extends SparkFunSuite {
 
     checkSQL(
       TimeAdd('a, interval),
-      "`a` + interval 1 hours"
+      "`a` + 1 hours"
     )
 
     checkSQL(
       TimeSub('a, interval),
-      "`a` - interval 1 hours"
+      "`a` - 1 hours"
     )
   }
 }

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

@@ -278,12 +278,12 @@ SELECT CAST('interval 3 month 1 hour' AS interval)
 -- !query 33 schema
 struct<CAST(interval 3 month 1 hour AS INTERVAL):interval>
 -- !query 33 output
-interval 3 months 1 hours
+3 months 1 hours
 
 
 -- !query 34
 SELECT CAST(interval 3 month 1 hour AS string)
 -- !query 34 schema
-struct<CAST(interval 3 months 1 hours AS STRING):string>
+struct<CAST(3 months 1 hours AS STRING):string>
 -- !query 34 output
-interval 3 months 1 hours
+3 months 1 hours

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

@@ -128,44 +128,44 @@ select date '2001-10-01' - date '2001-09-28'
 -- !query 14 schema
 struct<subtractdates(DATE '2001-10-01', DATE '2001-09-28'):interval>
 -- !query 14 output
-interval 3 days
+3 days
 
 
 -- !query 15
 select date'2020-01-01' - timestamp'2019-10-06 10:11:12.345678'
 -- !query 15 schema
 struct<subtracttimestamps(CAST(DATE '2020-01-01' AS TIMESTAMP), TIMESTAMP('2019-10-06 10:11:12.345678')):interval>
 -- !query 15 output
-interval 2078 hours 48 minutes 47.654322 seconds
+2078 hours 48 minutes 47.654322 seconds
 
 
 -- !query 16
 select timestamp'2019-10-06 10:11:12.345678' - date'2020-01-01'
 -- !query 16 schema
 struct<subtracttimestamps(TIMESTAMP('2019-10-06 10:11:12.345678'), CAST(DATE '2020-01-01' AS TIMESTAMP)):interval>
 -- !query 16 output
-interval -2078 hours -48 minutes -47.654322 seconds
+-2078 hours -48 minutes -47.654322 seconds
 
 
 -- !query 17
 select 3 * (timestamp'2019-10-15 10:11:12.001002' - date'2019-10-15')
 -- !query 17 schema
 struct<multiply_interval(subtracttimestamps(TIMESTAMP('2019-10-15 10:11:12.001002'), CAST(DATE '2019-10-15' AS TIMESTAMP)), CAST(3 AS DOUBLE)):interval>
 -- !query 17 output
-interval 30 hours 33 minutes 36.003006 seconds
+30 hours 33 minutes 36.003006 seconds
 
 
 -- !query 18
 select interval 4 month 2 weeks 3 microseconds * 1.5
 -- !query 18 schema
-struct<multiply_interval(interval 4 months 14 days 0.000003 seconds, CAST(1.5 AS DOUBLE)):interval>
+struct<multiply_interval(4 months 14 days 0.000003 seconds, CAST(1.5 AS DOUBLE)):interval>
 -- !query 18 output
-interval 6 months 21 days 0.000005 seconds
+6 months 21 days 0.000005 seconds
 
 
 -- !query 19
 select (timestamp'2019-10-15' - timestamp'2019-10-14') / 1.5
 -- !query 19 schema
 struct<divide_interval(subtracttimestamps(TIMESTAMP('2019-10-15 00:00:00'), TIMESTAMP('2019-10-14 00:00:00')), CAST(1.5 AS DOUBLE)):interval>
 -- !query 19 output
-interval 16 hours
+16 hours

sql/core/src/test/resources/sql-tests/results/group-by.sql.out

@@ -596,31 +596,31 @@ select sum(cast(v as interval)) from VALUES ('1 seconds'), ('2 seconds'), (null)
 -- !query 58 schema
 struct<sum(CAST(v AS INTERVAL)):interval>
 -- !query 58 output
-interval 3 seconds
+3 seconds
 
 
 -- !query 59
 select sum(cast(v as interval)) from VALUES ('-1 seconds'), ('2 seconds'), (null) t(v)
 -- !query 59 schema
 struct<sum(CAST(v AS INTERVAL)):interval>
 -- !query 59 output
-interval 1 seconds
+1 seconds
 
 
 -- !query 60
 select sum(cast(v as interval)) from VALUES ('-1 seconds'), ('-2 seconds'), (null) t(v)
 -- !query 60 schema
 struct<sum(CAST(v AS INTERVAL)):interval>
 -- !query 60 output
-interval -3 seconds
+-3 seconds
 
 
 -- !query 61
 select sum(cast(v as interval)) from VALUES ('-1 weeks'), ('2 seconds'), (null) t(v)
 -- !query 61 schema
 struct<sum(CAST(v AS INTERVAL)):interval>
 -- !query 61 output
-interval -7 days 2 seconds
+-7 days 2 seconds
 
 
 -- !query 62
@@ -632,8 +632,8 @@ group by i
 -- !query 62 schema
 struct<i:int,sum(CAST(v AS INTERVAL)):interval>
 -- !query 62 output
-1	interval -2 days
-2	interval 2 seconds
+1	-2 days
+2	2 seconds
 3	NULL
 
 
@@ -645,7 +645,7 @@ having sv is not null
 -- !query 63 schema
 struct<sv:interval>
 -- !query 63 output
-interval -2 days 2 seconds
+-2 days 2 seconds
 
 
 -- !query 64
@@ -656,7 +656,7 @@ FROM VALUES(1,'1 seconds'),(1,'2 seconds'),(2,NULL),(2,NULL) t(i,v)
 -- !query 64 schema
 struct<i:int,sum(CAST(v AS INTERVAL)) OVER (ORDER BY i ASC NULLS FIRST ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING):interval>
 -- !query 64 output
-1	interval 2 seconds
-1	interval 3 seconds
+1	2 seconds
+1	3 seconds
 2	NULL
 2	NULL