dongjoon-hyun commented on a change in pull request #26438: [SPARK-29408][SQL]
Support sign before `interval` in interval literals
URL: https://github.com/apache/spark/pull/26438#discussion_r344470714
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
##########
@@ -1932,14 +1935,22 @@ class AstBuilder(conf: SQLConf) extends
SqlBaseBaseVisitor[AnyRef] with Logging
* - from-to unit, for instance: interval '1-2' year to month.
*/
override def visitInterval(ctx: IntervalContext): Literal = withOrigin(ctx) {
+ def applySign(interval: CalendarInterval): CalendarInterval = {
+ if (ctx.sign != null && ctx.sign.getText == "-") {
+ IntervalUtils.negate(interval)
+ } else {
+ interval
+ }
+ }
if (ctx.errorCapturingMultiUnitsInterval != null) {
val innerCtx = ctx.errorCapturingMultiUnitsInterval
if (innerCtx.unitToUnitInterval != null) {
throw new ParseException(
"Can only have a single from-to unit in the interval literal syntax",
innerCtx.unitToUnitInterval)
}
- Literal(visitMultiUnitsInterval(innerCtx.multiUnitsInterval),
CalendarIntervalType)
+ val interval =
applySign(visitMultiUnitsInterval(innerCtx.multiUnitsInterval))
Review comment:
```scala
- val interval =
applySign(visitMultiUnitsInterval(innerCtx.multiUnitsInterval))
+ val interval = applySign(ctx.sign,
visitMultiUnitsInterval(innerCtx.multiUnitsInterval))
```
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