LuciferYang commented on a change in pull request #34313:
URL: https://github.com/apache/spark/pull/34313#discussion_r737118939
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
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@@ -1617,6 +1617,8 @@ case class ParseUrl(children: Seq[Expression],
failOnError: Boolean = SQLConf.ge
case class FormatString(children: Expression*) extends Expression with
ImplicitCastInputTypes {
require(children.nonEmpty, s"$prettyName() should take at least 1 argument")
+ require(checkArgumentIndexNotZero(children(0)), "Illegal format argument
index = 0")
Review comment:
@cloud-fan Is there any sample? I'll fix it later
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