[SPARK-8999][MLlib]Support non-temporal sequence in PrefixSpan (Array[Int])

[zhangjiajin]

Support non-temporal sequence in PrefixSpan (Array[Int])

[zhangjiajin]

@mengxr @feynmanliang Please review. Thx.

[SparkQA]

Test build #38361 has finished for PR 7646 at commit 216ab0c.

• This patch fails Scala style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[zhangjiajin]

@mengxr About benchmark data sets for performance testing, can you give some suggestions?

[SparkQA]

Test build #38364 has finished for PR 7646 at commit ae8c02d.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #39145 has finished for PR 7646 at commit 09dc409.

• This patch fails Scala style tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • public static final class StringPrefixComparatorDesc extends PrefixComparator
  • public static final class LongPrefixComparator extends PrefixComparator
  • public static final class LongPrefixComparatorDesc extends PrefixComparator
  • public static final class DoublePrefixComparator extends PrefixComparator
  • public static final class DoublePrefixComparatorDesc extends PrefixComparator
  • public static class CompactDecimalWriter
  • public static class DecimalWriter
  • case class SortPrefix(child: SortOrder) extends UnaryExpression
  • case class ToDate(child: Expression) extends UnaryExpression with ImplicitCastInputTypes
  • case class TruncDate(date: Expression, format: Expression)
  • case class TungstenSort(

[SparkQA]

Test build #39148 has finished for PR 7646 at commit 5785cb8.

• This patch fails Scala style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #39150 has finished for PR 7646 at commit 740c203.

• This patch fails Scala style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #39153 has finished for PR 7646 at commit 60a0b76.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #39173 has finished for PR 7646 at commit f486dcd.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.