Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/10488#discussion_r48534869
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -57,9 +57,10 @@ case class Md5(child: Expression) extends
UnaryExpression with ImplicitCastInput
* the hash length is not one of the permitted values, the return value is
NULL.
*/
@ExpressionDescription(
- usage = "_FUNC_(input, bitLength) - Returns a checksum of SHA-2 family
as a hex string of the " +
- "input. SHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit
length of 0 is equivalent " +
- "to 256",
+ usage =
+ """_FUNC_(input, bitLength) - Returns a checksum of SHA-2 family as a
hex string of the input.
+ SHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit length of
0 is equivalent to 256."""
+ ,
--- End diff --
In another way, I am trying to reproduce this compilation error in a
standalone test case. However, I cannot reproduce this failure (i.e.
compilations are successfully finished).
```
$ cat ExpressionDescription.java
import java.lang.annotation.*;
@Retention(RetentionPolicy.RUNTIME)
public @interface ExpressionDescription {
String usage() default "_FUNC_ is undocumented";
String extended() default "No example for _FUNC_.";
}
$ cat test.scala
@ExpressionDescription(
usage = "_FUNC_(input, bitLength) - Returns a checksum of SHA-2 family as
a hex string of the " +
"input. SHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit
length of 0 is equivalent " +
"to 256",
extended = "> SELECT _FUNC_('Spark', 0);\n " +
"'529bc3b07127ecb7e53a4dcf1991d9152c24537d919178022b2c42657f79a26b'")
class test {
def func() : Unit = {
val str = "abc" + "123" + "XYZ"
}
}
$ javac ExpressionDescription.java
$ ~/scala-2.11.7/bin/scalac test.scala
$
```
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