cloud-fan commented on a change in pull request #35060:
URL: https://github.com/apache/spark/pull/35060#discussion_r786117500
##########
File path:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/StringExpressionsSuite.scala
##########
@@ -888,6 +889,179 @@ class StringExpressionsSuite extends SparkFunSuite with
ExpressionEvalHelper {
Literal.create(null, IntegerType), Literal.create(null, IntegerType)),
null)
}
+ test("ToNumber") {
+ ToNumber(Literal("454"), Literal("")).checkInputDataTypes() match {
+ case TypeCheckResult.TypeCheckFailure(msg) =>
+ assert(msg.contains("Number format cannot be empty"))
+ }
+ ToNumber(Literal("454"), NonFoldableLiteral.create("999", StringType))
+ .checkInputDataTypes() match {
+ case TypeCheckResult.TypeCheckFailure(msg) =>
+ assert(msg.contains("Format expression must be foldable"))
+ }
+
+ // Test '0' and '9'
+
+ Seq("454", "054", "54", "450").foreach { input =>
+ val invalidFormat1 = 0.until(input.length - 1).map(_ => '0').mkString
+ val invalidFormat2 = 0.until(input.length - 2).map(_ => '0').mkString
+ val invalidFormat3 = 0.until(input.length - 1).map(_ => '9').mkString
+ val invalidFormat4 = 0.until(input.length - 2).map(_ => '9').mkString
+ Seq(invalidFormat1, invalidFormat2, invalidFormat3, invalidFormat4)
+ .filter(_.nonEmpty).foreach { format =>
+ checkExceptionInExpression[IllegalArgumentException](
+ ToNumber(Literal("454"), Literal(format)), s"Format '$format' used
for" +
+ " parsing string to number or formatting number to string is
invalid")
+ }
+
+ val format1 = 0.until(input.length).map(_ => '0').mkString
+ val format2 = 0.until(input.length).map(_ => '9').mkString
+ val format3 = 0.until(input.length + 1).map(_ => '0').mkString
+ val format4 = 0.until(input.length + 1).map(_ => '9').mkString
+ val format5 = 0.until(input.length + 2).map(_ => '0').mkString
+ val format6 = 0.until(input.length + 2).map(_ => '9').mkString
+ Seq(format1, format2, format3, format4, format5, format6).foreach {
format =>
+ checkEvaluation(ToNumber(Literal(input), Literal(format)),
Decimal(input))
+ }
+ }
+
+ // Test '.' and 'D'
+ checkExceptionInExpression[IllegalArgumentException](
+ ToNumber(Literal("454.2"), Literal("999")),
+ "Format '999' used for parsing string to number or formatting number to
string is invalid")
Review comment:
I think we should refine the error message. `999` is indeed a valid
number format string. The problem is the input does not match it.
How about
```
The input string '$input' does not match the given number format: '$format'
```
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