Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7805#discussion_r35941994
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -779,4 +779,38 @@ object DateTimeUtils {
}
date + (lastDayOfMonthInYear - dayInYear)
}
+
+ private val TRUNC_TO_YEAR = 1
+ private val TRUNC_TO_MONTH = 2
+ private val TRUNC_INVALID = -1
+
+ /**
+ * Returns the trunc date from original date and trunc level.
+ * Trunc level should be generated using `parseTruncLevel()`, should
only be 1 or 2.
+ */
+ def truncDate(d: Int, level: Int): Int = {
+ if (level == TRUNC_TO_YEAR) {
+ d - DateTimeUtils.getDayInYear(d) + 1
+ } else if (level == TRUNC_TO_MONTH) {
+ d - DateTimeUtils.getDayOfMonth(d) + 1
+ } else {
+ throw new Exception(s"Invalid trunc level: $level")
--- End diff --
sys.error("...")
and add a comment explaining this should never be hit because trunc level
is internally generated.
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