Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/15998#discussion_r89656509
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/ExternalCatalog.scala
---
@@ -189,6 +189,21 @@ abstract class ExternalCatalog {
spec: TablePartitionSpec): Option[CatalogTablePartition]
/**
+ * List the names of all partitions that belong to the specified table,
assuming it exists.
+ *
+ * A partial partition spec may optionally be provided to filter the
partitions returned.
+ * For instance, if there exist partitions (a='1', b='2'), (a='1',
b='3') and (a='2', b='4'),
+ * then a partial spec of (a='1') will return the first two only.
--- End diff --
nit: newline here
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