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-rw-r--r--scalding/scalding-debugging.md24
1 files changed, 23 insertions, 1 deletions
diff --git a/scalding/scalding-debugging.md b/scalding/scalding-debugging.md
index 2e29fce..ed51031 100644
--- a/scalding/scalding-debugging.md
+++ b/scalding/scalding-debugging.md
@@ -1,4 +1,3 @@
-
Quick tips for debugging scalding issues...
## Dependencies
@@ -45,3 +44,26 @@ Another time, saw a bunch of `None.get` errors when running tests. These were
resolved by ensuring that the `HBaseSource` constructors had exactly identical
names and arguments (eg, table names and zookeeper quorums have to be exact
matches).
+
+## Fields
+
+Values of type `List[Fields]` are not printed in the expected way:
+
+ $ scala -cp cascading-core-2.6.1.jar
+ Welcome to Scala 2.11.12 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_31).
+ Type in expressions for evaluation. Or try :help.
+
+ scala> import cascading.tuple.Fields
+ import cascading.tuple.Fields
+
+ scala> val fields1 = new Fields("a", "b")
+ fields1: cascading.tuple.Fields = 'a', 'b'
+
+ scala> val fields2 = new Fields("c")
+ fields2: cascading.tuple.Fields = 'c'
+
+ scala> val allFields = List(fields1, fields2)
+ allFields: List[cascading.tuple.Fields] = List('a', 'b', 'c')
+
+ scala> allFields.length
+ res0: Int = 2