lt
Less than.
// Scala: The following selects people younger than 21.
people.select( people("age") < 21 )
// Kotlin:
import org.jetbrains.kotlinx.spark.api.*
people.select( people("age") lt 21 )
// Java:
import static org.apache.spark.sql.functions.*;
people.select( people.col("age").lt(21) );
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