cloud-fan commented on a change in pull request #28875:
URL: https://github.com/apache/spark/pull/28875#discussion_r443951058
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
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@@ -468,13 +458,25 @@ class AstBuilder(conf: SQLConf) extends
SqlBaseBaseVisitor[AnyRef] with Logging
throw new ParseException("There must be at least one WHEN clause in a
MERGE statement", ctx)
}
// children being empty means that the condition is not set
- if (matchedActions.length == 2 && matchedActions.head.children.isEmpty) {
- throw new ParseException("When there are 2 MATCHED clauses in a MERGE
statement, " +
- "the first MATCHED clause must have a condition", ctx)
- }
- if (matchedActions.groupBy(_.getClass).mapValues(_.size).exists(_._2 > 1))
{
+ val matchedActionSize = matchedActions.length
+ if (matchedActionSize >= 2 &&
!matchedActions.init.forall(_.condition.nonEmpty)) {
+ throw new ParseException(
+ s"When there are $matchedActionSize MATCHED clauses in a MERGE
statement, " +
Review comment:
can we make the error message simpler?
```
When there are more than one MATCHED clauses in a MERGE statement, only
the last MATCHED clause can omit the condition.
```
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