Interface OptionalArgument

All Known Implementing Classes:
Coalesce, CountDistinct, CountDistinctOverTime, DateFormat, DateParse, FirstOverTime, Greatest, IpPrefix, Knn, LastOverTime, Least, Locate, Log, Match, MatchOperator, MatchPhrase, MultiMatch, MvSlice, MvSort, MvZip, QueryString, Rate, Repeat, Round, SpatialGridFunction, StGeohash, StGeohex, StGeotile, Substring, ToIp

public interface OptionalArgument
Marker interface indicating that a function accepts one optional argument (typically the last one). This is used by the EsqlFunctionRegistry to perform validation of function declaration.