[SPARK-30593][SQL] Revert interval ISO/ANSI SQL Standard output since…

… we decide not to follow ANSI and no round trip

### What changes were proposed in this pull request?

This revert #26418, file a new ticket under  https://issues.apache.org/jira/browse/SPARK-30546 for better tracking interval behavior
### Why are the changes needed?

Revert interval ISO/ANSI SQL Standard output since we decide not to follow ANSI and there is no round trip

### Does this PR introduce any user-facing change?

no, not released yet

### How was this patch tested?

existing uts

Closes #27304 from yaooqinn/SPARK-30593.

Authored-by: Kent Yao <yaooqinn@hotmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>

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

@@ -46,6 +46,36 @@ public void equalsTest() {
     assertEquals(i1, i6);
   }
 
+  @Test
+  public void toStringTest() {
+    CalendarInterval i;
+
+    i = new CalendarInterval(0, 0, 0);
+    assertEquals("0 seconds", i.toString());
+
+    i = new CalendarInterval(34, 0, 0);
+    assertEquals("2 years 10 months", i.toString());
+
+    i = new CalendarInterval(-34, 0, 0);
+    assertEquals("-2 years -10 months", i.toString());
+
+    i = new CalendarInterval(0, 31, 0);
+    assertEquals("31 days", i.toString());
+
+    i = new CalendarInterval(0, -31, 0);
+    assertEquals("-31 days", i.toString());
+
+    i = new CalendarInterval(0, 0, 3 * MICROS_PER_HOUR + 13 * MICROS_PER_MINUTE + 123);
+    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("-3 hours -13 minutes -0.000123 seconds", i.toString());
+
+    i = new CalendarInterval(34, 31, 3 * MICROS_PER_HOUR + 13 * MICROS_PER_MINUTE + 123);
+    assertEquals("2 years 10 months 31 days 3 hours 13 minutes 0.000123 seconds",
+      i.toString());
+  }
+
   @Test
   public void periodAndDurationTest() {
     CalendarInterval interval = new CalendarInterval(120, -40, 123456);

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

@@ -30,9 +30,7 @@ import org.apache.spark.sql.catalyst.expressions.codegen.Block._
 import org.apache.spark.sql.catalyst.util._
 import org.apache.spark.sql.catalyst.util.DateTimeConstants._
 import org.apache.spark.sql.catalyst.util.DateTimeUtils._
-import org.apache.spark.sql.catalyst.util.IntervalUtils._
 import org.apache.spark.sql.internal.SQLConf
-import org.apache.spark.sql.internal.SQLConf.IntervalStyle._
 import org.apache.spark.sql.types._
 import org.apache.spark.unsafe.UTF8StringBuilder
 import org.apache.spark.unsafe.types.{CalendarInterval, UTF8String}
@@ -283,14 +281,8 @@ abstract class CastBase extends UnaryExpression with TimeZoneAwareExpression wit
 
   // UDFToString
   private[this] def castToString(from: DataType): Any => Any = from match {
-    case CalendarIntervalType => SQLConf.get.intervalOutputStyle match {
-      case SQL_STANDARD =>
-        buildCast[CalendarInterval](_, i => UTF8String.fromString(toSqlStandardString(i)))
-      case ISO_8601 =>
-        buildCast[CalendarInterval](_, i => UTF8String.fromString(toIso8601String(i)))
-      case MULTI_UNITS =>
-        buildCast[CalendarInterval](_, i => UTF8String.fromString(toMultiUnitsString(i)))
-    }
+    case CalendarIntervalType =>
+      buildCast[CalendarInterval](_, i => UTF8String.fromString(i.toString))
     case BinaryType => buildCast[Array[Byte]](_, UTF8String.fromBytes)
     case DateType => buildCast[Int](_, d => UTF8String.fromString(dateFormatter.format(d)))
     case TimestampType => buildCast[Long](_,
@@ -1021,13 +1013,7 @@ abstract class CastBase extends UnaryExpression with TimeZoneAwareExpression wit
         (c, evPrim, evNull) => code"""$evPrim = UTF8String.fromString(
           org.apache.spark.sql.catalyst.util.DateTimeUtils.timestampToString($tf, $c));"""
       case CalendarIntervalType =>
-        val iu = IntervalUtils.getClass.getCanonicalName.stripSuffix("$")
-        val funcName = SQLConf.get.intervalOutputStyle match {
-          case SQL_STANDARD => "toSqlStandardString"
-          case ISO_8601 => "toIso8601String"
-          case MULTI_UNITS => "toMultiUnitsString"
-        }
-        (c, evPrim, _) => code"""$evPrim = UTF8String.fromString($iu.$funcName($c));"""
+        (c, evPrim, _) => code"""$evPrim = UTF8String.fromString($c.toString());"""
       case ArrayType(et, _) =>
         (c, evPrim, evNull) => {
           val buffer = ctx.freshVariable("buffer", classOf[UTF8StringBuilder])

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

@@ -409,7 +409,7 @@ case class Literal (value: Any, dataType: DataType) extends LeafExpression {
         DateTimeUtils.getZoneId(SQLConf.get.sessionLocalTimeZone))
       s"TIMESTAMP '${formatter.format(v)}'"
     case (i: CalendarInterval, CalendarIntervalType) =>
-      s"INTERVAL '${IntervalUtils.toMultiUnitsString(i)}'"
+      s"INTERVAL '${i.toString}'"
     case (v: Array[Byte], BinaryType) => s"X'${DatatypeConverter.printHexBinary(v)}'"
     case _ => value.toString
   }

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/IntervalUtils.scala

@@ -497,85 +497,6 @@ object IntervalUtils {
     fromDoubles(interval.months / num, interval.days / num, interval.microseconds / num)
   }
 
-  // `toString` implementation in CalendarInterval is the multi-units format currently.
-  def toMultiUnitsString(interval: CalendarInterval): String = interval.toString
-
-  def toSqlStandardString(interval: CalendarInterval): String = {
-    val yearMonthPart = if (interval.months < 0) {
-      val ma = math.abs(interval.months)
-      "-" + ma / 12 + "-" + ma % 12
-    } else if (interval.months > 0) {
-      "+" + interval.months / 12 + "-" + interval.months % 12
-    } else {
-      ""
-    }
-
-    val dayPart = if (interval.days < 0) {
-      interval.days.toString
-    } else if (interval.days > 0) {
-      "+" + interval.days
-    } else {
-      ""
-    }
-
-    val timePart = if (interval.microseconds != 0) {
-      val sign = if (interval.microseconds > 0) "+" else "-"
-      val sb = new StringBuilder(sign)
-      var rest = math.abs(interval.microseconds)
-      sb.append(rest / MICROS_PER_HOUR)
-      sb.append(':')
-      rest %= MICROS_PER_HOUR
-      val minutes = rest / MICROS_PER_MINUTE;
-      if (minutes < 10) {
-        sb.append(0)
-      }
-      sb.append(minutes)
-      sb.append(':')
-      rest %= MICROS_PER_MINUTE
-      val bd = BigDecimal.valueOf(rest, 6)
-      if (bd.compareTo(new BigDecimal(10)) < 0) {
-        sb.append(0)
-      }
-      val s = bd.stripTrailingZeros().toPlainString
-      sb.append(s)
-      sb.toString()
-    } else {
-      ""
-    }
-
-    val intervalList = Seq(yearMonthPart, dayPart, timePart).filter(_.nonEmpty)
-    if (intervalList.nonEmpty) intervalList.mkString(" ") else "0"
-  }
-
-  def toIso8601String(interval: CalendarInterval): String = {
-    val sb = new StringBuilder("P")
-
-    val year = interval.months / 12
-    if (year != 0) sb.append(year + "Y")
-    val month = interval.months % 12
-    if (month != 0) sb.append(month + "M")
-
-    if (interval.days != 0) sb.append(interval.days + "D")
-
-    if (interval.microseconds != 0) {
-      sb.append('T')
-      var rest = interval.microseconds
-      val hour = rest / MICROS_PER_HOUR
-      if (hour != 0) sb.append(hour + "H")
-      rest %= MICROS_PER_HOUR
-      val minute = rest / MICROS_PER_MINUTE
-      if (minute != 0) sb.append(minute + "M")
-      rest %= MICROS_PER_MINUTE
-      if (rest != 0) {
-        val bd = BigDecimal.valueOf(rest, 6)
-        sb.append(bd.stripTrailingZeros().toPlainString + "S")
-      }
-    } else if (interval.days == 0 && interval.months == 0) {
-      sb.append("T0S")
-    }
-    sb.toString()
-  }
-
   private object ParseState extends Enumeration {
     type ParseState = Value
 

sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala

@@ -1799,23 +1799,6 @@ object SQLConf {
       .checkValues(StoreAssignmentPolicy.values.map(_.toString))
       .createWithDefault(StoreAssignmentPolicy.ANSI.toString)
 
-  object IntervalStyle extends Enumeration {
-    type IntervalStyle = Value
-    val SQL_STANDARD, ISO_8601, MULTI_UNITS = Value
-  }
-
-  val INTERVAL_STYLE = buildConf("spark.sql.intervalOutputStyle")
-    .doc("When converting interval values to strings (i.e. for display), this config decides the" +
-      " interval string format. The value SQL_STANDARD will produce output matching SQL standard" +
-      " interval literals (i.e. '+3-2 +10 -00:00:01'). The value ISO_8601 will produce output" +
-      " matching the ISO 8601 standard (i.e. 'P3Y2M10DT-1S'). The value MULTI_UNITS (which is the" +
-      " default) will produce output in form of value unit pairs, (i.e. '3 year 2 months 10 days" +
-      " -1 seconds'")
-    .stringConf
-    .transform(_.toUpperCase(Locale.ROOT))
-    .checkValues(IntervalStyle.values.map(_.toString))
-    .createWithDefault(IntervalStyle.MULTI_UNITS.toString)
-
   val ANSI_ENABLED = buildConf("spark.sql.ansi.enabled")
     .doc("When true, Spark tries to conform to the ANSI SQL specification: 1. Spark will " +
       "throw a runtime exception if an overflow occurs in any operation on integral/decimal " +
@@ -2667,8 +2650,6 @@ class SQLConf extends Serializable with Logging {
   def storeAssignmentPolicy: StoreAssignmentPolicy.Value =
     StoreAssignmentPolicy.withName(getConf(STORE_ASSIGNMENT_POLICY))
 
-  def intervalOutputStyle: IntervalStyle.Value = IntervalStyle.withName(getConf(INTERVAL_STYLE))
-
   def ansiEnabled: Boolean = getConf(ANSI_ENABLED)
 
   def nestedSchemaPruningEnabled: Boolean = getConf(NESTED_SCHEMA_PRUNING_ENABLED)

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/util/IntervalUtilsSuite.scala

@@ -304,70 +304,6 @@ class IntervalUtilsSuite extends SparkFunSuite with SQLHelper {
     }
   }
 
-  test("to ansi sql standard string") {
-    val i1 = new CalendarInterval(0, 0, 0)
-    assert(IntervalUtils.toSqlStandardString(i1) === "0")
-    val i2 = new CalendarInterval(34, 0, 0)
-    assert(IntervalUtils.toSqlStandardString(i2) === "+2-10")
-    val i3 = new CalendarInterval(-34, 0, 0)
-    assert(IntervalUtils.toSqlStandardString(i3) === "-2-10")
-    val i4 = new CalendarInterval(0, 31, 0)
-    assert(IntervalUtils.toSqlStandardString(i4) === "+31")
-    val i5 = new CalendarInterval(0, -31, 0)
-    assert(IntervalUtils.toSqlStandardString(i5) === "-31")
-    val i6 = new CalendarInterval(0, 0, 3 * MICROS_PER_HOUR + 13 * MICROS_PER_MINUTE + 123)
-    assert(IntervalUtils.toSqlStandardString(i6) === "+3:13:00.000123")
-    val i7 = new CalendarInterval(0, 0, -3 * MICROS_PER_HOUR - 13 * MICROS_PER_MINUTE - 123)
-    assert(IntervalUtils.toSqlStandardString(i7) === "-3:13:00.000123")
-    val i8 = new CalendarInterval(-34, 31, 3 * MICROS_PER_HOUR + 13 * MICROS_PER_MINUTE + 123)
-    assert(IntervalUtils.toSqlStandardString(i8) === "-2-10 +31 +3:13:00.000123")
-    val i9 = new CalendarInterval(0, 0, -3000 * MICROS_PER_HOUR)
-    assert(IntervalUtils.toSqlStandardString(i9) === "-3000:00:00")
-  }
-
-  test("to iso 8601 string") {
-    val i1 = new CalendarInterval(0, 0, 0)
-    assert(IntervalUtils.toIso8601String(i1) === "PT0S")
-    val i2 = new CalendarInterval(34, 0, 0)
-    assert(IntervalUtils.toIso8601String(i2) === "P2Y10M")
-    val i3 = new CalendarInterval(-34, 0, 0)
-    assert(IntervalUtils.toIso8601String(i3) === "P-2Y-10M")
-    val i4 = new CalendarInterval(0, 31, 0)
-    assert(IntervalUtils.toIso8601String(i4) === "P31D")
-    val i5 = new CalendarInterval(0, -31, 0)
-    assert(IntervalUtils.toIso8601String(i5) === "P-31D")
-    val i6 = new CalendarInterval(0, 0, 3 * MICROS_PER_HOUR + 13 * MICROS_PER_MINUTE + 123)
-    assert(IntervalUtils.toIso8601String(i6) === "PT3H13M0.000123S")
-    val i7 = new CalendarInterval(0, 0, -3 * MICROS_PER_HOUR - 13 * MICROS_PER_MINUTE - 123)
-    assert(IntervalUtils.toIso8601String(i7) === "PT-3H-13M-0.000123S")
-    val i8 = new CalendarInterval(-34, 31, 3 * MICROS_PER_HOUR + 13 * MICROS_PER_MINUTE + 123)
-    assert(IntervalUtils.toIso8601String(i8) === "P-2Y-10M31DT3H13M0.000123S")
-    val i9 = new CalendarInterval(0, 0, -3000 * MICROS_PER_HOUR)
-    assert(IntervalUtils.toIso8601String(i9) === "PT-3000H")
-  }
-
-  test("to multi units string") {
-    val i1 = new CalendarInterval(0, 0, 0)
-    assert(IntervalUtils.toMultiUnitsString(i1) === "0 seconds")
-    val i2 = new CalendarInterval(34, 0, 0)
-    assert(IntervalUtils.toMultiUnitsString(i2) === "2 years 10 months")
-    val i3 = new CalendarInterval(-34, 0, 0)
-    assert(IntervalUtils.toMultiUnitsString(i3) === "-2 years -10 months")
-    val i4 = new CalendarInterval(0, 31, 0)
-    assert(IntervalUtils.toMultiUnitsString(i4) === "31 days")
-    val i5 = new CalendarInterval(0, -31, 0)
-    assert(IntervalUtils.toMultiUnitsString(i5) === "-31 days")
-    val i6 = new CalendarInterval(0, 0, 3 * MICROS_PER_HOUR + 13 * MICROS_PER_MINUTE + 123)
-    assert(IntervalUtils.toMultiUnitsString(i6) === "3 hours 13 minutes 0.000123 seconds")
-    val i7 = new CalendarInterval(0, 0, -3 * MICROS_PER_HOUR - 13 * MICROS_PER_MINUTE - 123)
-    assert(IntervalUtils.toMultiUnitsString(i7) === "-3 hours -13 minutes -0.000123 seconds")
-    val i8 = new CalendarInterval(-34, 31, 3 * MICROS_PER_HOUR + 13 * MICROS_PER_MINUTE + 123)
-    assert(IntervalUtils.toMultiUnitsString(i8) ===
-      "-2 years -10 months 31 days 3 hours 13 minutes 0.000123 seconds")
-    val i9 = new CalendarInterval(0, 0, -3000 * MICROS_PER_HOUR)
-    assert(IntervalUtils.toMultiUnitsString(i9) === "-3000 hours")
-  }
-
   test("from day-time string") {
     def check(input: String, from: IntervalUnit, to: IntervalUnit, expected: String): Unit = {
       withClue(s"from = $from, to = $to") {

sql/core/src/main/scala/org/apache/spark/sql/execution/HiveResult.scala

@@ -22,10 +22,8 @@ import java.sql.{Date, Timestamp}
 
 import org.apache.spark.sql.Row
 import org.apache.spark.sql.catalyst.util.{DateFormatter, DateTimeUtils, TimestampFormatter}
-import org.apache.spark.sql.catalyst.util.IntervalUtils._
 import org.apache.spark.sql.execution.command.{DescribeCommandBase, ExecutedCommandExec, ShowTablesCommand}
 import org.apache.spark.sql.internal.SQLConf
-import org.apache.spark.sql.internal.SQLConf.IntervalStyle._
 import org.apache.spark.sql.types._
 import org.apache.spark.unsafe.types.CalendarInterval
 
@@ -75,12 +73,7 @@ object HiveResult {
     case (decimal: java.math.BigDecimal, DecimalType()) => decimal.toPlainString
     case (n, _: NumericType) => n.toString
     case (s: String, StringType) => if (nested) "\"" + s + "\"" else s
-    case (interval: CalendarInterval, CalendarIntervalType) =>
-      SQLConf.get.intervalOutputStyle match {
-        case SQL_STANDARD => toSqlStandardString(interval)
-        case ISO_8601 => toIso8601String(interval)
-        case MULTI_UNITS => toMultiUnitsString(interval)
-      }
+    case (interval: CalendarInterval, CalendarIntervalType) => interval.toString
     case (seq: Seq[_], ArrayType(typ, _)) =>
       seq.map(v => (v, typ)).map(e => toHiveString(e, true)).mkString("[", ",", "]")
     case (m: Map[_, _], MapType(kType, vType, _)) =>

sql/core/src/test/resources/sql-tests/inputs/postgreSQL/interval.sql

@@ -272,12 +272,10 @@ SELECT interval '1 2:03:04' minute to second;
 -- test output of couple non-standard interval values in the sql style
 -- [SPARK-29406] Interval output styles
 -- SET IntervalStyle TO sql_standard;
-set spark.sql.intervalOutputStyle=SQL_STANDARD;
-SELECT  interval '1 day -1 hours',
-        interval '-1 days +1 hours',
-        interval '1 years 2 months -3 days 4 hours 5 minutes 6.789 seconds',
-        - interval '1 years 2 months -3 days 4 hours 5 minutes 6.789 seconds';
-set spark.sql.intervalOutputStyle=MULTI_UNITS;
+-- SELECT  interval '1 day -1 hours',
+--         interval '-1 days +1 hours',
+--         interval '1 years 2 months -3 days 4 hours 5 minutes 6.789 seconds',
+--         - interval '1 years 2 months -3 days 4 hours 5 minutes 6.789 seconds';
 
 -- test outputting iso8601 intervals
 -- [SPARK-29406] Interval output styles