maropu commented on a change in pull request #29947:
URL: https://github.com/apache/spark/pull/29947#discussion_r499954268
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
##########
@@ -53,7 +53,45 @@ case class PrintToStderr(child: Expression) extends
UnaryExpression {
}
/**
- * A function throws an exception if 'condition' is not true.
+ * Throw with the result of an expression (used for debugging).
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(expr) - Throws an exception with `expr`.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_('custom error message');
+ java.lang.RuntimeException
+ custom error message
+ """,
+ since = "3.1.0")
+case class RaiseError(child: Expression) extends UnaryExpression with
ImplicitCastInputTypes {
+
+ override def foldable: Boolean = false
+ override def dataType: DataType = NullType
+ override def inputTypes: Seq[AbstractDataType] = Seq(StringType)
+
+ override def prettyName: String = "raise_error"
+
+ override def nullSafeEval(input: Any): Unit =
+ throw new RuntimeException(input.toString())
+
+ // if (true) is to avoid codegen compilation exception that statement is
unreachable
+ override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
+ val eval = child.genCode(ctx)
+ ExprCode(
+ code = code"""${eval.code}
+ |if (true) {
+ | throw new RuntimeException(${eval.value}.toString());
+ |}
+ """.stripMargin,
Review comment:
nit format:
```
code = code"""${eval.code}
|if (true) {
| throw new RuntimeException(${eval.value}.toString());
|}""".stripMargin,
```
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