[GitHub] [spark] cloud-fan commented on a change in pull request #26261: [SPARK-29607][SQL] Move static methods from CalendarInterval to IntervalUtils

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cloud-fan commented on a change in pull request #26261: [SPARK-29607][SQL] Move static methods from CalendarInterval to IntervalUtils
URL: https://github.com/apache/spark/pull/26261#discussion_r339416220
 
 

 ##########
 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/IntervalUtils.scala
 ##########
 @@ -119,4 +121,191 @@ object IntervalUtils {
       case _: IllegalArgumentException => null
     }
   }
+
+  private val yearMonthPattern = Pattern.compile("^([+|-])?(\\d+)-(\\d+)$")
+
+  private val dayTimePattern = Pattern.compile(
+    "^([+|-])?((\\d+) )?((\\d+):)?(\\d+):(\\d+)(\\.(\\d+))?$")
+
+  private def toLongWithRange(
+      fieldName: String,
+      s: String,
+      minValue: Long,
+      maxValue: Long): Long = {
+    val result = if (s == null) 0L else s.toLong
+    require(minValue <= result && result <= maxValue,
+      s"$fieldName $result outside range [$minValue, $maxValue]")
+
+    result
+  }
+
+  /**
+   * Parse YearMonth string in form: [-]YYYY-MM
 
 Review comment:
   the regex is actually `[+|-]YYYY-MM`, not a big deal though

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