Adding upstream version 18.13.0.upstream/18.13.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/sqlglot/helper.py b/sqlglot/helper.py
index 00d49ae..74b61e3 100644
--- a/sqlglot/helper.py
+++ b/sqlglot/helper.py
@@ -441,6 +441,14 @@ def first(it: t.Iterable[T]) -> T:
 
 
 def merge_ranges(ranges: t.List[t.Tuple[A, A]]) -> t.List[t.Tuple[A, A]]:
+    """
+    Merges a sequence of ranges, represented as tuples (low, high) whose values
+    belong to some totally-ordered set.
+
+    Example:
+        >>> merge_ranges([(1, 3), (2, 6)])
+        [(1, 6)]
+    """
     if not ranges:
         return []