Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/12340#discussion_r59840175
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -487,6 +487,50 @@ case class PrintToStderr(child: Expression) extends
UnaryExpression {
}
/**
+ * A function throws an exception if 'condition' is not true.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(condition) - Throw an exception if 'condition' is not
true.")
+case class AssertTrue(child: Expression) extends UnaryExpression {
+
+ override def nullable: Boolean = true
+
+ def dataType: DataType = NullType
+
+ override def prettyName: String = "assert_true"
+
+ override def checkInputDataTypes(): TypeCheckResult = {
+ if (child.dataType != BooleanType) {
+ TypeCheckResult.TypeCheckFailure(
+ s"type of condition expression in assert_true should be boolean,
not ${child.dataType}")
+ } else {
+ TypeCheckResult.TypeCheckSuccess
+ }
+ }
+
+ override def eval(input: InternalRow) : Any = {
+ val v = child.eval(input)
+ if (java.lang.Boolean.TRUE.equals(v)) {
+ null
+ } else {
+ throw new RuntimeException(s"'${child.simpleString}' is not true!")
+ }
+ }
+
+ override def genCode(ctx: CodegenContext, ev: ExprCode): String = {
+ val eval = child.gen(ctx)
+ ev.isNull = "true"
+ ev.value = "null"
+ s"""if (${eval.isNull} ||
!java.lang.Boolean.TRUE.equals(${eval.value})) {
+ | throw new RuntimeException("'${child.simpleString}' is not
true.");
+ |}
+ """.stripMargin
+ }
+
+ override def sql: String = s"assert_true(${child.sql})"
--- End diff --
I thought like that, but It's used in SQL representation like the following.
== Physical Plan ==
WholeStageCodegen
: +- Project [null AS **assert_true(true)**#4]
: +- INPUT
+- Scan OneRowRelation[]
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