Merging upstream version 18.3.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

sqlglot/expressions.py

@@ -3350,6 +3350,7 @@ class Subquery(DerivedTable, Unionable):
 class TableSample(Expression):
     arg_types = {
         "this": False,
+        "expressions": False,
         "method": False,
         "bucket_numerator": False,
         "bucket_denominator": False,
@@ -3542,6 +3543,7 @@ class DataType(Expression):
         UINT = auto()
         UINT128 = auto()
         UINT256 = auto()
+        UMEDIUMINT = auto()
         UNIQUEIDENTIFIER = auto()
         UNKNOWN = auto()  # Sentinel value, useful for type annotation
         USERDEFINED = "USER-DEFINED"
@@ -3708,7 +3710,7 @@ class Rollback(Expression):
 
 
 class AlterTable(Expression):
-    arg_types = {"this": True, "actions": True, "exists": False}
+    arg_types = {"this": True, "actions": True, "exists": False, "only": False}
 
 
 class AddConstraint(Expression):
@@ -3992,16 +3994,11 @@ class TimeUnit(Expression):
         super().__init__(**args)
 
 
-# https://www.oracletutorial.com/oracle-basics/oracle-interval/
-# https://trino.io/docs/current/language/types.html#interval-year-to-month
-class IntervalYearToMonthSpan(Expression):
-    arg_types = {}
-
-
 # https://www.oracletutorial.com/oracle-basics/oracle-interval/
 # https://trino.io/docs/current/language/types.html#interval-day-to-second
-class IntervalDayToSecondSpan(Expression):
-    arg_types = {}
+# https://docs.databricks.com/en/sql/language-manual/data-types/interval-type.html
+class IntervalSpan(Expression):
+    arg_types = {"this": True, "expression": True}
 
 
 class Interval(TimeUnit):