diff --git a/ibis/expr/operations/generic.py b/ibis/expr/operations/generic.py
@@ -18,7 +18,7 @@
 from ibis.common import exceptions as com
 from ibis.common.annotations import attribute
 from ibis.common.grounds import Singleton
-from ibis.expr.operations.core import Named, Unary, Value
+from ibis.expr.operations.core import Named, Unary, Value, Variadic
 from ibis.util import frozendict
 
 try:
@@ -155,31 +155,18 @@ class NullIf(Value):
 
 
 @public
-class CoalesceLike(Value):
-
-    # According to Impala documentation:
-    # Return type: same as the initial argument value, except that integer
-    # values are promoted to BIGINT and floating-point values are promoted to
-    # DOUBLE; use CAST() when inserting into a smaller numeric column
-    arg = rlz.nodes_of(rlz.any)
-
-    output_shape = rlz.shape_like('arg')
-    output_dtype = rlz.dtype_like('arg')
-
-
-@public
-class Coalesce(CoalesceLike):
-    pass
+class Coalesce(Variadic):
+    arg = rlz.variadic(rlz.any)
 
 
 @public
-class Greatest(CoalesceLike):
-    pass
+class Greatest(Variadic):
+    arg = rlz.variadic(rlz.any)
 
 
 @public
-class Least(CoalesceLike):
-    pass
+class Least(Variadic):
+    arg = rlz.variadic(rlz.any)
 
 
 @public

diff --git a/ibis/expr/operations/strings.py b/ibis/expr/operations/strings.py
@@ -3,7 +3,7 @@
 import ibis.expr.datatypes as dt
 import ibis.expr.rules as rlz
 from ibis.common.annotations import attribute
-from ibis.expr.operations.core import Unary, Value
+from ibis.expr.operations.core import Unary, Value, Variadic
 
 
 @public
@@ -216,15 +216,8 @@ class StringSplit(Value):
 
 
 @public
-class StringConcat(Value):
-    arg = rlz.nodes_of(rlz.string)
-
-    output_shape = rlz.shape_like("arg")
-    output_dtype = dt.string
-
-    @attribute.default
-    def output_shape(self):
-        return rlz.highest_precedence_shape(self.arg.values)
+class StringConcat(Variadic):
+    arg = rlz.variadic(rlz.string)
 
 
 @public

diff --git a/ibis/expr/types/generic.py b/ibis/expr/types/generic.py
@@ -123,7 +123,7 @@ def coalesce(self, *args: Value) -> Value:
         >>> ibis.coalesce(None, 4, 5)
         Coalesce([ValueList(values=[None, 4, 5])])
         """
-        return ops.Coalesce([self, *args]).to_expr()
+        return ops.Coalesce(self, *args).to_expr()
 
     def greatest(self, *args: ir.Value) -> ir.Value:
         """Compute the largest value among the supplied arguments.
@@ -138,7 +138,7 @@ def greatest(self, *args: ir.Value) -> ir.Value:
         Value
             Maximum of the passed arguments
         """
-        return ops.Greatest([self, *args]).to_expr()
+        return ops.Greatest(self, *args).to_expr()
 
     def least(self, *args: ir.Value) -> ir.Value:
         """Compute the smallest value among the supplied arguments.
@@ -153,7 +153,7 @@ def least(self, *args: ir.Value) -> ir.Value:
         Value
             Minimum of the passed arguments
         """
-        return ops.Least([self, *args]).to_expr()
+        return ops.Least(self, *args).to_expr()
 
     def typeof(self) -> ir.StringValue:
         """Return the data type of the expression.

diff --git a/ibis/expr/types/strings.py b/ibis/expr/types/strings.py
@@ -697,7 +697,7 @@ def concat(
         StringValue
             All strings concatenated
         """
-        return ops.StringConcat([self, other, *args]).to_expr()
+        return ops.StringConcat(self, other, *args).to_expr()
 
     def __add__(self, other: str | StringValue) -> StringValue:
         """Concatenate strings.
@@ -712,7 +712,7 @@ def __add__(self, other: str | StringValue) -> StringValue:
         StringValue
             All strings concatenated
         """
-        return ops.StringConcat([self, other]).to_expr()
+        return ops.StringConcat(self, other).to_expr()
 
     def __radd__(self, other: str | StringValue) -> StringValue:
         """Concatenate strings.
@@ -727,7 +727,7 @@ def __radd__(self, other: str | StringValue) -> StringValue:
         StringValue
             All strings concatenated
         """
-        return ops.StringConcat([other, self]).to_expr()
+        return ops.StringConcat(other, self).to_expr()
 
     def convert_base(
         self,

diff --git a/ibis/tests/expr/test_operations.py b/ibis/tests/expr/test_operations.py
@@ -66,7 +66,7 @@
     ops.RegexReplace('asd', 'as', 'a'),
     ops.StringReplace('asd', 'as', 'a'),
     ops.StringSplit('asd', 's'),
-    ops.StringConcat(['s', 'e']),
+    ops.StringConcat('s', 'e'),
     ops.StartsWith('asd', 'as'),
     ops.EndsWith('asd', 'xyz'),
     ops.Not(false),