fix: converting datepart and timepart to strings for Combinedatetime

Author: Aradhya

frappe/query_builder/functions.py

@@ -1,3 +1,4 @@
+from datetime import time
 from enum import Enum
 
 from pypika.functions import *
@@ -35,6 +36,9 @@ def __init__(self, term: str, time=None, alias=None):
 
 class _PostgresTimestamp(ArithmeticExpression):
 	def __init__(self, datepart, timepart, alias=None):
+		"""Postgres would need both datepart and timepart to be a string for concatenation"""
+		if isinstance(timepart, time) or isinstance(datepart, time):
+			timepart, datepart = str(timepart), str(datepart)
 		if isinstance(datepart, str):
 			datepart = Cast(datepart, "date")
 		if isinstance(timepart, str):