[GitHub] [spark] yaooqinn commented on a change in pull request #32176: [WIP][SPARK-35076][SQL] Parse interval literals as ANSI intervals

[GitBox <gi...@apache.org>]

yaooqinn commented on a change in pull request #32176:
URL: https://github.com/apache/spark/pull/32176#discussion_r614096789



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File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
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@@ -2306,12 +2307,24 @@ class AstBuilder extends SqlBaseBaseVisitor[AnyRef] with SQLConfHelper with Logg
   }
 
   /**
-   * Create a [[CalendarInterval]] literal expression. Two syntaxes are supported:
+   * Create a [[CalendarInterval]] or ANSI interval literal expression.
+   * Two syntaxes are supported:
    * - multiple unit value pairs, for instance: interval 2 months 2 days.
    * - from-to unit, for instance: interval '1-2' year to month.
    */
   override def visitInterval(ctx: IntervalContext): Literal = withOrigin(ctx) {
-    Literal(parseIntervalLiteral(ctx), CalendarIntervalType)
+    val parsedInterval = parseIntervalLiteral(ctx)
+    if (SQLConf.get.legacyIntervalEnabled) {

Review comment:
       nit: `conf. legacyIntervalEnabled`




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